Comet
C/2009 P1 (Garradd)
2011/07/01
2012/01/22 2012/01/30
2012/02/01
2012/03/02
2012/03/14 2012/03/15
2012/03/17
2012/03/23
2012/03/24
2012 Mar 24
|
Mouse-over to
browse the specially-processed version in 4-color sequels with L-S
filtered attached.
The plasma tail
bifurcating from the coma can be manifestly seen in the above image.
For the image
stacked in average method, see
here.
|
MPC observation computed with Astrometrica
using both UCAC-3 and USNO-A2.0 star catalogs -- the former for astrometric
reduction and the latter for photometric work:
- COD C42
CON M.-T. Hui, Dept. of Physics, Wuhan University, China
OBS M.-T. Hui
MEA M.-T. Hui
TEL 0.89-m f/4 refractor + CCD
NET UCAC-3
CK09P010
KC2012 03 24.60815 10 16 19.22 +64 08 33.0
10.6 N D18
CK09P010 KC2012 03 24.61347 10 16 16.97 +64 08 18.8
10.7 N D18
CK09P010 KC2012 03 24.61875 10 16 14.47 +64 08 03.4
10.7 N D18
CK09P010 KC2012 03 24.62411 10 16 12.02 +64 07 48.3
10.7 N D18
CK09P010 KC2012 03 24.62940 10 16 09.46 +64 07 32.6
10.6 N D18
CK09P010 KC2012 03 24.63493 10 16 07.01 +64 07 16.5
10.6 N D18
CK09P010 KC2012 03 24.64024 10 16 04.48 +64 07 00.4
10.7 N D18
CK09P010 KC2012 03 24.64560 10 16 02.04 +64 06 46.1
10.7 N D18
CK09P010 KC2012 03 24.65089 10 15 59.59 +64 06 30.5
10.6 N D18
CK09P010 KC2012 03 24.65655 10 15 57.13 +64 06 15.0
10.7 N D18
CK09P010 KC2012 03 24.66182 10 15 54.60 +64 05 59.1
10.7 N D18
CK09P010 KC2012 03 24.66707 10 15 52.14 +64 05 43.6
10.7 N D18
CK09P010 KC2012 03 24.67233 10 15 49.97 +64 05 29.5
10.6 N D18
CK09P010 KC2012 03 24.67760 10 15 47.46 +64 05 13.8
10.6 N D18
CK09P010 KC2012 03 24.68822 10 15 42.48 +64 04 42.9
10.6 N D18
CK09P010 KC2012 03 24.69355 10 15 40.10 +64 04 27.4
10.7 N D18
CK09P010 KC2012 03 24.69883 10 15 37.73 +64 04 12.4
10.7 N D18
CK09P010 KC2012 03 24.70428 10 15 35.07 +64 03 55.7
10.7 N D18
CK09P010 KC2012 03 24.71378 10 15 30.97 +64 03 29.5
10.6 N D18
CK09P010 KC2012 03 24.72729 10 15 24.54 +64 02 49.4
10.6 N D18
CK09P010 KC2012 03 24.73341 10 15 21.77 +64 02 30.9
10.7 N D18
CK09P010 KC2012 03 24.74388 10 15 17.08 +64 02 00.9
10.7 N D18
CK09P010 KC2012 03 24.74921 10 15 14.48 +64 01 44.9
10.6 N D18
CK09P010 KC2012 03 24.75451 10 15 12.27 +64 01 30.1
10.6 N D18
CK09P010 KC2012 03 24.75983 10 15 09.90 +64 01 14.9
10.7 N D18
CK09P010 KC2012 03 24.76539 10 15 07.39 +64 00 58.5
10.7 N D18
----- end -----Photometry result computed with FOCAS II,
which processes images based upon the .LOG file of Astrometrica, by means of
Multibox method. The last observation has been deprived of photometric results
attributed to interference from a nearby star.
- COD C42
CATALOG: USNO A2.0 / CMC-14 - BAND: R
10x10 20x20 30x30
40x40 50x50 60x60
SNR SB
COD
OBJECT DATE
TIME +/- +/-
+/- +/- +/- +/-
N FWHM CAT
------------ ---------- -------- -----
----- ----- -----
----- ----- ----
---- ---
C/2009 P1 24/03/2012 16:22:08 10.65
9.92 9.50
9.22 9.02 8.86 43.6 19.0 D18
C/2009 P1 24/03/2012 16:22:08*
0.05 0.04
0.04 0.04
0.04 0.04
26 17.4 USN
FoCAs II - 17/03/2010
www.astrosurf.com/cometas-obs
es.groups.yahoo.com/group/Cometas_Obs
- Interpretation of the FOCAS II table
headings:
-
-
- Fisrt line:
-
- OBJECT,
DATE, TIME: refering to their original meanings respectively
-
- 10x10,
20x20 ... 60x60: the aperture sizes of photometry in term of
rectangle in arcsec that are used to measure an object's magnitude
-
- SNR:
the Signal-to-Noise Ratio for aperture photometry
-
- SB:
stars of faintest magnitude on the images used in data reduction with
the used star catalog in Astrometrica, rather than the stars of faintest
magnitude in the images
-
- COD:
MPC Code of the observatory
-
-
-
- Second line:
-
- +/-:
precisions of measurement
-
- N:
the number of used images for measurement
-
- FWHM:
Full-Width-Half-Maximum of total PSF, relevant to degree of seeing
-
- CAT:
the used star catalog in Astrometrica
-
-
The infinite aperture magnitude cannot be
revealed through these sets of data obtained from FocasII as the enclosure is
not large enough; a 60" x 60" box centered on the optocenter of the coma only
occupies a very small fraction of the coma.
Copyright @ Man-To
Hui
2012/06/14
2012 Mar 23
|
Mouse-over to
browse the specially-processed version in 4-color sequels with L-S
filtered attached. |
MPC observation computed with Astrometrica
using both UCAC-3 and USNO-A2.0 star catalogs -- the former for astrometric
reduction and the latter for photometric work:
- COD C42
CON M.-T. Hui, Dept. of Physics, Wuhan University, China
OBS M.-T. Hui, X.Gao
MEA M.-T. Hui
TEL 0.107-m f/2.8 refractor + CCD
NET UCAC-3
CK09P010 KC2012 03
23.72134 10 23 19.14 +64 50 32.9 10.2 N C42
CK09P010 KC2012 03 23.72748 10 23 16.12 +64 50 15.6 10.2 N
C42
CK09P010 KC2012 03 23.73332 10 23 13.21 +64 49 59.0 10.2 N
C42
CK09P010 KC2012 03 23.73916 10 23 10.33 +64 49 42.7 10.2 N
C42
CK09P010 KC2012 03 23.74500 10 23 07.40 +64 49 26.3 10.3 N
C42
CK09P010 KC2012 03 23.75083 10 23 04.50 +64 49 09.9 10.3 N
C42
CK09P010 KC2012 03 23.75664 10 23 01.62 +64 48 53.3 10.2 N
C42
CK09P010 KC2012 03 23.76247 10 22 58.79 +64 48 37.0 10.2 N
C42
CK09P010 KC2012 03 23.76830 10 22 55.85 +64 48 20.1 10.3 N
C42
CK09P010 KC2012 03 23.77416 10 22 53.03 +64 48 03.7 10.3 N
C42
CK09P010 KC2012 03 23.77999 10 22 50.01 +64 47 46.9 10.3 N
C42
CK09P010 KC2012 03 23.78581 10 22 47.08 +64 47 30.7
C42
----- end -----Photometry result computed with FOCAS II,
which processes images based upon the .LOG file of Astrometrica, by means of
Multibox method. The last observation has been deprived of photometric results
attributed to interference from a nearby star.
- COD C42
CATALOG: USNO A2.0 / CMC-14 - BAND: R
10x10 20x20 30x30
40x40 50x50 60x60
SNR SB
COD
OBJECT DATE
TIME +/- +/-
+/- +/- +/- +/-
N FWHM CAT
------------ ---------- -------- -----
----- ----- -----
----- ----- ----
---- ---
C/2009 P1 23/03/2012 18:01:08 10.25
9.58 9.17 8.91
8.71 8.56 50.3 19.1 C42
C/2009 P1 23/03/2012 18:01:08* 0.01
0.01 0.01 0.01
0.01 0.01
11 25.7 USN
FoCAs II - 17/03/2010
www.astrosurf.com/cometas-obs
es.groups.yahoo.com/group/Cometas_Obs
- Interpretation of the FOCAS II table
headings:
-
-
- Fisrt line:
-
- OBJECT,
DATE, TIME: refering to their original meanings respectively
-
- 10x10,
20x20 ... 60x60: the aperture sizes of photometry in term of
rectangle in arcsec that are used to measure an object's magnitude
-
- SNR:
the Signal-to-Noise Ratio for aperture photometry
-
- SB:
stars of faintest magnitude on the images used in data reduction with
the used star catalog in Astrometrica, rather than the stars of faintest
magnitude in the images
-
- COD:
MPC Code of the observatory
-
-
-
- Second line:
-
- +/-:
precisions of measurement
-
- N:
the number of used images for measurement
-
- FWHM:
Full-Width-Half-Maximum of total PSF, relevant to degree of seeing
-
- CAT:
the used star catalog in Astrometrica
-
-
The trend of decline in brightness seems to be
authentic. Yet more sessions are in need with certitude before a firm conclusion
is drawn. The monitor will resume.
Copyright @ Man-To
Hui
2012/03/27
2012 Mar 17
|
The apparent
vignetting effect is not mainly attributed to the image problem
but to the excessive brightness from the comet. Obviously larger
aperture is not suitable for observations of such a bright comet
in terms of analysis of both the global dust and plasma tails,
but fine features in the vicinity of the optocenter of the
comet, i.e., the pseudonuclear. Click the image to browse the
one in full resolution.
|
|
Wavelet
enhanced version the stacked version. It is intriguing to
witness fine features around the pseudonuclear, which is
somewhat arbitarily believed to be formed after interference
with high-energy materials from a CME event errupted recently.
Additionally, another dust tail fainter than the one towards S
is also visible in this image, towards SSE. A hollow feature is
also witnessed approximately to the SW of the pseudonuclear,
possibly owing to decrease of the dust production rate following
the strong interference with the solar ions.
|
|
Hitherto the
suspicious jet spotted by myself in the stacked image taken on
Mar 14 in the course of NSP has been well convinced. During this
session with a much higher resolution, Larson-Sekanina filter
reveals the jet in length of 1'.1 in P.A. 341°.
|
MPC observation computed with Astrometrica
using both UCAC-3 and USNO-A2.0 star catalogs -- the former for astrometric
reduction and the latter for photometric work:
- COD C42
CON M.-T. Hui, Dept. of Physics, Wuhan University, China
OBS M.-T. Hui, X.Gao
MEA M.-T. Hui
TEL 0.36-m f/6.9 Schmidt-Cassegrain + CCD
NET UCAC-3
CK09P010 C2012 03 17.78828 11 25 03.50 +68 51 55.1
11.4 N C42
CK09P010 C2012 03 17.78877 11 25 03.20 +68 51 53.9
11.4 N C42
CK09P010 C2012 03 17.78925 11 25 02.74 +68 51 53.1
11.4 N C42
CK09P010 C2012 03 17.78972 11 25 02.44 +68 51 52.1
11.4 N C42
CK09P010 C2012 03 17.79021 11 25 02.06 +68 51 51.1
11.4 N C42
CK09P010 C2012 03 17.79068 11 25 01.69 +68 51 50.2
11.4 N C42
CK09P010 C2012 03 17.79117 11 25 01.30 +68 51 49.3
11.4 N C42
CK09P010 C2012 03 17.79166 11 25 01.02 +68 51 48.5
11.4 N C42
CK09P010 C2012 03 17.79214 11 25 00.49 +68 51 47.6
11.4 N C42
CK09P010 C2012 03 17.79262 11 25 00.07 +68 51 46.4
11.4 N C42
CK09P010 C2012 03 17.79309 11 24 59.82 +68 51 45.5
11.4 N C42
CK09P010 C2012 03 17.79358 11 24 59.42 +68 51 44.6
C42
CK09P010 C2012 03 17.79405 11 24 59.14 +68 51 43.8
11.4 N C42
CK09P010 C2012 03 17.79453 11 24 58.77 +68 51 42.9
11.4 N C42
CK09P010 C2012 03 17.79502 11 24 58.40 +68 51 41.9
11.4 N C42
CK09P010 C2012 03 17.79551 11 24 58.01 +68 51 41.0
11.4 N C42
CK09P010 C2012 03 17.79600 11 24 57.61 +68 51 39.9
11.4 N C42
CK09P010 C2012 03 17.79648 11 24 57.14 +68 51 39.2
11.4 N C42
CK09P010 C2012 03 17.79699 11 24 56.76 +68 51 38.0
11.4 N C42
CK09P010 C2012 03 17.79747 11 24 56.41 +68 51 37.1
11.4 N C42
CK09P010 C2012 03 17.79795 11 24 56.13 +68 51 36.3
11.4 N C42
CK09P010 C2012 03 17.79845 11 24 55.72 +68 51 35.5
11.4 N C42
CK09P010 C2012 03 17.79892 11 24 55.32 +68 51 34.5
11.4 N C42
CK09P010 C2012 03 17.79942 11 24 54.97 +68 51 33.3
11.4 N C42
CK09P010 C2012 03 17.79984 11 24 54.63 +68 51 32.5
11.4 N C42
CK09P010 C2012 03 17.80025 11 24 54.24 +68 51 31.8
11.4 N C42
CK09P010 C2012 03 17.80068 11 24 54.03 +68 51 31.0
11.4 N C42
CK09P010 C2012 03 17.80110 11 24 53.69 +68 51 30.1
11.4 N C42
CK09P010 C2012 03 17.80152 11 24 53.40 +68 51 29.4
11.4 N C42
CK09P010 C2012 03 17.80193 11 24 53.00 +68 51 28.5
11.4 N C42
CK09P010 C2012 03 17.80235 11 24 52.70 +68 51 27.8
11.4 N C42
CK09P010 C2012 03 17.80278 11 24 52.45 +68 51 27.0
11.4 N C42
CK09P010 C2012 03 17.80319 11 24 52.06 +68 51 26.2
11.4 N C42
CK09P010 C2012 03 17.80362 11 24 51.64 +68 51 25.4
11.4 N C42
CK09P010 C2012 03 17.80404 11 24 51.36 +68 51 24.3
11.4 N C42
CK09P010 C2012 03 17.80446 11 24 50.97 +68 51 23.5
11.4 N C42
CK09P010 C2012 03 17.80487 11 24 50.76 +68 51 22.8
11.4 N C42
CK09P010 C2012 03 17.80529 11 24 50.45 +68 51 22.0
11.4 N C42
CK09P010 C2012 03 17.80571 11 24 50.05 +68 51 21.2
11.4 N C42
CK09P010 C2012 03 17.80613 11 24 49.89 +68 51 20.7
C42
----- end -----Photometry result computed with FOCAS II,
which processes images based upon the .LOG file of Astrometrica, by means of
Multibox method. Due to the deteriorating weather conditions, the last four
observations have been deprived of photometric results.
- COD C42
CATALOG: USNO A2.0 / CMC-14 - BAND: R
10x10 20x20 30x30
40x40 50x50 60x60
SNR SB
COD
OBJECT DATE
TIME +/- +/-
+/- +/- +/- +/-
N FWHM CAT
------------ ---------- -------- -----
----- ----- -----
----- ----- ----
---- ---
C/2009 P1 17/03/2012 19:08:12 11.42 10.55 10.09
9.79 9.56 9.39 96.9 20.5 C42
C/2009 P1 17/03/2012 19:08:12* 0.01
0.02 0.02 0.02
0.02 0.02
38 3.3 USN
FoCAs II - 17/03/2010
www.astrosurf.com/cometas-obs
es.groups.yahoo.com/group/Cometas_Obs
- Interpretation of the FOCAS II table
headings:
-
-
- Fisrt line:
-
- OBJECT,
DATE, TIME: refering to their original meanings respectively
-
- 10x10,
20x20 ... 60x60: the aperture sizes of photometry in term of
rectangle in arcsec that are used to measure an object's magnitude
-
- SNR:
the Signal-to-Noise Ratio for aperture photometry
-
- SB:
stars of faintest magnitude on the images used in data reduction with
the used star catalog in Astrometrica, rather than the stars of faintest
magnitude in the images
-
- COD:
MPC Code of the observatory
-
-
-
- Second line:
-
- +/-:
precisions of measurement
-
- N:
the number of used images for measurement
-
- FWHM:
Full-Width-Half-Maximum of total PSF, relevant to degree of seeing
-
- CAT:
the used star catalog in Astrometrica
-
-
The observation of this session was conducted
specifically so as to reveal the fine features around the pseudonuclear. It is
apparently the magnitudes in multibox even fainter than during the last session,
however, the large difference is maily ascribed to be systematic error from
different types of apparatus, therefore resulting in incomparability between the
data.
Copyright @ Man-To
Hui
2012/03/21
2012 Mar 15
|
Mouse-over to browse the specially-processed
version dyed in 4-color sequels with L-S filtered one. Owing to
deterioration of the weather, the image quality is not
identically good as during last session and thus led to
seemingly decrease in both the dust tail towards NE and the
plasma tail. Yet the pseudocoloered version managed to reveal
the inostensible parts in the B/W version. As more observations
from other observers who imaged the comet through much larger
aperture scopes, the jet feature has been confirmed.
|
MPC observation computed with Astrometrica
using both UCAC-3 and USNO-A2.0 star catalogs -- the former for astrometric
reduction and the latter for photometric work:
- COD C42
CON M.-T. Hui, Dept. of Physics, Wuhan University, China
OBS M.-T. Hui, X.Gao
MEA M.-T. Hui
TEL 0.107-m f/2.8 refractor + CCD
NET UCAC-3
CK09P010 KC2012 03 15.78219 11 52 17.22 +69 48 14.2
09.8 N C42
CK09P010 KC2012 03 15.79036 11 52 10.11 +69 48 02.3
09.8 N C42
CK09P010 KC2012 03 15.79853 11 52 03.20 +69 47 50.5
09.9 N C42
CK09P010 KC2012 03 15.80670 11 51 56.27 +69 47 39.4
09.9 N C42
CK09P010 KC2012 03 15.81587 11 51 47.97 +69 47 25.9
C42
CK09P010 KC2012 03 15.82454 11 51 41.31 +69 47 14.4
C42
CK09P010 KC2012 03 15.83372 11 51 33.22 +69 47 01.1
C42
CK09P010 KC2012 03 15.84304 11 51 24.19 +69 46 46.0
C42
----- end -----Photometry result computed with FOCAS II,
which processes images based upon the .LOG file of Astrometrica, by means of
Multibox method. Due to the deteriorating weather conditions, the last four
observations have been deprived of photometric results.
- COD C42
CATALOG: USNO A2.0 / CMC-14 - BAND: R
10x10 20x20 30x30
40x40 50x50 60x60
SNR SB
COD
OBJECT DATE
TIME +/- +/-
+/- +/- +/- +/-
N FWHM CAT
------------ ---------- -------- -----
----- ----- -----
----- ----- ----
---- ---
C/2009 P1 15/03/2012 19:04:00
9.85 9.25 8.88
8.62 8.43 8.29 61.9 19.3 C42
C/2009 P1 15/03/2012 19:04:00* 0.03
0.02 0.02 0.02
0.01 0.02
4 27.7 USN
FoCAs II - 17/03/2010
www.astrosurf.com/cometas-obs
es.groups.yahoo.com/group/Cometas_Obs
- Interpretation of the FOCAS II table
headings:
-
-
- Fisrt line:
-
- OBJECT,
DATE, TIME: refering to their original meanings respectively
-
- 10x10,
20x20 ... 60x60: the aperture sizes of photometry in term of
rectangle in arcsec that are used to measure an object's magnitude
-
- SNR:
the Signal-to-Noise Ratio for aperture photometry
-
- SB:
stars of faintest magnitude on the images used in data reduction with
the used star catalog in Astrometrica, rather than the stars of faintest
magnitude in the images
-
- COD:
MPC Code of the observatory
-
-
-
- Second line:
-
- +/-:
precisions of measurement
-
- N:
the number of used images for measurement
-
- FWHM:
Full-Width-Half-Maximum of total PSF, relevant to degree of seeing
-
- CAT:
the used star catalog in Astrometrica
-
-
Albeit the multibox reveals that the measured
brightness of the comet recovers somewhat compared to the result from previous
observation, generally speaking, the magnitude now has been in decline. As for
how large the slope will be, it is worthwhile to conduct more observations of
the comet, and therefore we will keep
our monitor as much as we can.
Copyright @ Man-To
Hui
2012/03/17
2012 Mar 14
|
Mouse-over to browse the specially-processed
version dyed in 4-color sequels with L-S filtered one. When the
image was Larson-Sekanina filtered in different parameters and
in different combinations of parameters, a jet feature
persistently pointing in around P.A. 0° is shown. As the image
scale is insufficient, this could be artificial attributed to
stars in vicinity. Anyway it deserves more observations to
monitor.
|
MPC observation computed with Astrometrica
using both UCAC-3 and USNO-A2.0 star catalogs -- the former for astrometric
reduction and the latter for photometric work:
- COD C42
CON M.-T. Hui, Dept. of Physics, Wuhan University, China
OBS M.-T. Hui, X.Gao
MEA M.-T. Hui
TEL 0.107-m f/2.8 refractor + CCD
NET UCAC-3
CK09P010 KC2012 03 14.73015 12 07 43.28 +70 10 25.5
10.1 N C42
CK09P010 KC2012 03 14.73606 12 07 37.59 +70 10 18.7
10.1 N C42
CK09P010 KC2012 03 14.74197 12 07 32.28 +70 10 12.3
10.1 N C42
CK09P010 KC2012 03 14.74757 12 07 27.84 +70 10 07.0
10.1 N C42
CK09P010 KC2012 03 14.75372 12 07 21.83 +70 09 59.4
10.2 N C42
CK09P010 KC2012 03 14.75954 12 07 16.48 +70 09 52.8
10.1 N C42
CK09P010 KC2012 03 14.76534 12 07 11.15 +70 09 46.2
10.1 N C42
CK09P010 KC2012 03 14.77115 12 07 06.00 +70 09 39.9
10.1 N C42
CK09P010 KC2012 03 14.78840 12 06 50.34 +70 09 20.4
10.2 N C42
CK09P010 KC2012 03 14.79422 12 06 45.19 +70 09 14.1
10.1 N C42
CK09P010 KC2012 03 14.80007 12 06 39.85 +70 09 07.3
10.1 N C42
CK09P010 KC2012 03 14.80590 12 06 34.59 +70 09 00.7
10.1 N C42
CK09P010 KC2012 03 14.81171 12 06 29.31 +70 08 54.1
10.1 N C42
----- end -----Photometry result computed with FOCAS II,
which processes images based upon the .LOG file of Astrometrica, by means of
Multibox method:
- COD C42
CATALOG: USNO A2.0 / CMC-14 - BAND: R
10x10 20x20 30x30
40x40 50x50 60x60
SNR SB
COD
OBJECT DATE
TIME +/- +/-
+/- +/- +/- +/-
N FWHM CAT
------------ ---------- -------- -----
----- ----- -----
----- ----- ----
---- ---
C/2009 P1 14/03/2012 18:28:20 10.13
9.48 9.09 8.82
8.63 8.48 74.2 19.5 C42
C/2009 P1 14/03/2012 18:28:20* 0.02
0.01 0.02 0.02
0.02 0.02
13 20.7 USN
FoCAs II - 17/03/2010
www.astrosurf.com/cometas-obs
es.groups.yahoo.com/group/Cometas_Obs
- Interpretation of the FOCAS II table
headings:
-
-
- Fisrt line:
-
- OBJECT,
DATE, TIME: refering to their original meanings respectively
-
- 10x10,
20x20 ... 60x60: the aperture sizes of photometry in term of
rectangle in arcsec that are used to measure an object's magnitude
-
- SNR:
the Signal-to-Noise Ratio for aperture photometry
-
- SB:
stars of faintest magnitude on the images used in data reduction with
the used star catalog in Astrometrica, rather than the stars of faintest
magnitude in the images
-
- COD:
MPC Code of the observatory
-
-
-
- Second line:
-
- +/-:
precisions of measurement
-
- N:
the number of used images for measurement
-
- FWHM:
Full-Width-Half-Maximum of total PSF, relevant to degree of seeing
-
- CAT:
the used star catalog in Astrometrica
-
-
Judging from the photometric measurements, it
seems that the brightness of comet C/2009 P1 (Garradd) starts to decline. But
more evidence is in need to draw a firm and sturdy conclusion and therefore we
Xingming Observatory C42 will definitely perform consecutive monitor of the
comet.
Copyright @ Man-To
Hui
2012/03/15
2012 Mar 02
|
The moonlight
posed great impact upon the observation, and therefore both the
dust and the ion tails appear more fragile than did last
observation, which is in reality overall a trick attributed to
the observation condition. Relatively scarcity of the stacked
images also plays an important role as well.
Mouse-over to browse the specially-processed
version dyed in 4-color sequels with L-S filtered one.
|
MPC observation computed with Astrometrica
using both UCAC-3 and USNO-A2.0 star catalogs -- the former for astrometric
reduction and the latter for photometric work:
- COD C42
CON M.-T. Hui, Dept. of Physics, Wuhan University, China
OBS M.-T. Hui, X.Gao
MEA M.-T. Hui
TEL 0.107-m f/2.8 refractor + CCD
NET UCAC-3
CK09P010 KC2012 03 02.70071 15 05 23.29 +67 15 58.3
C42
CK09P010 KC2012 03 02.70598 15 05 20.10 +67 16 10.6
C42
CK09P010 KC2012 03 02.71087 15 05 15.89 +67 16 21.5
09.4 N C42
CK09P010 KC2012 03 02.71561 15 05 12.59 +67 16 34.1
09.5 N C42
CK09P010 KC2012 03 02.72036 15 05 09.46 +67 16 46.0
09.5 N C42
CK09P010 KC2012 03 02.72513 15 05 06.08 +67 16 58.2
09.6 N C42
----- end -----Photometry result computed with FOCAS II,
which processes images based upon the .LOG file of Astrometrica, by means of
Multibox method:
- COD C42
CATALOG: USNO A2.0 / CMC-14 - BAND: R
10x10 20x20 30x30
40x40 50x50 60x60
SNR SB
COD
OBJECT DATE
TIME +/- +/-
+/- +/- +/- +/-
N FWHM CAT
------------ ---------- -------- -----
----- ----- -----
----- ----- ----
---- ---
C/2009 P1 02/03/2012 17:13:54
9.49 8.75
8.33 8.04 7.83
7.67 47.8 17.3 C42
C/2009 P1 02/03/2012 17:13:54* 0.06
0.03 0.03
0.03 0.03
0.03 4 21.1 USN
FoCAs II - 17/03/2010
www.astrosurf.com/cometas-obs
es.groups.yahoo.com/group/Cometas_Obs
- Interpretation of the FOCAS II table
headings:
-
-
- Fisrt line:
-
- OBJECT,
DATE, TIME: refering to their original meanings respectively
-
- 10x10,
20x20 ... 60x60: the aperture sizes of photometry in term of
rectangle in arcsec that are used to measure an object's magnitude
-
- SNR:
the Signal-to-Noise Ratio for aperture photometry
-
- SB:
stars of faintest magnitude on the images used in data reduction with
the used star catalog in Astrometrica, rather than the stars of faintest
magnitude in the images
-
- COD:
MPC Code of the observatory
-
-
-
- Second line:
-
- +/-:
precisions of measurement
-
- N:
the number of used images for measurement
-
- FWHM:
Full-Width-Half-Maximum of total PSF, relevant to degree of seeing
-
- CAT:
the used star catalog in Astrometrica
-
-
The first two observations were neglected in
terms of photometry for the comet passes extremely close to a star, which
definitely contaminates the photometric measurements.
Copyright @ Man-To
Hui
2012/03/06
2012 Feb 01
|
The observation
was free from clouds during the session, and therefore one of the
dust tails and the ion tail even exceed the FOV of the image, as
shown in the pseudocolored version in the lower right corner.
For full resolution of the pseudocolored, please click on the
image. Meanwhile, I fail in spotting any "spiral feature" around
the pseudonucleus in the L-S filtered image as shows Jan 30
2012's observation.
Mouse-over to browse the entire image without the specially-processed appendices in the
diagonal.
|
MPC observation computed with Astrometrica
using both UCAC-3 and CMC-14 star catalogs -- the former for astrometric
reduction and the latter for photometric work:
- COD C42
CON M.-T. Hui, Dept. of Physics, Wuhan University, China
OBS M.-T. Hui, X.Gao
MEA M.-T. Hui
TEL 0.107-m f/2.8 refractor + CCD
NET UCAC-3
CK09P010 KC2012 02 01.86771 17 16 22.79 +41 52 53.8
09.8 N C42
CK09P010 KC2012 02 01.87990 17 16 21.92 +41 53 24.0
09.8 N C42
CK09P010 KC2012 02 01.89209 17 16 21.08 +41 53 54.8
09.8 N C42
CK09P010 KC2012 02 01.90429 17 16 20.20 +41 54 25.6
09.8 N C42
CK09P010 KC2012 02 01.91652 17 16 19.39 +41 54 55.7
09.8 N C42
CK09P010 KC2012 02 01.92869 17 16 18.51 +41 55 26.6
09.8 N C42
CK09P010 KC2012 02 01.94089 17 16 17.65 +41 55 57.3
09.8 N C42
CK09P010 KC2012 02 01.95311 17 16 16.84 +41 56 27.7
09.9 N C42
CK09P010 KC2012 02 01.96532 17 16 15.93 +41 56 58.4
09.8 N C42
CK09P010 KC2012 02 01.97890 17 16 14.94 +41 57 32.5
09.6 N C42
CK09P010 KC2012 02 01.99355 17 16 13.89 +41 58 09.3
09.6 N C42
CK09P010 KC2012 02 02.00443 17 16 13.12 +41 58 36.5
C42
----- end -----
|
 |
-
Gaussian curve
generated by
PhAst.
- Owing to interference from clouds
during the session, FWHM appears smaller compared to the value obtained
last time.
|
-
- Photometry result computed with FOCAS II,
which processes images based upon the .LOG file of Astrometrica, by means of
Multibox method:
- COD C42
CATALOG: USNO A2.0 / CMC-14 - BAND: R
10x10 20x20 30x30
40x40 50x50 60x60
SNR SB
COD
OBJECT DATE
TIME +/- +/-
+/- +/- +/- +/-
N FWHM CAT
------------ ---------- -------- -----
----- ----- -----
----- ----- ----
---- ---
C/2009 P1 01/02/2012 22:18:01
9.76 9.10 8.69
8.42 8.21 8.05 74.9 19.3 C42
C/2009 P1 01/02/2012 22:18:01* 0.08
0.06 0.05 0.05
0.05 0.04
11 22.9 CMC
FoCAs II - 17/03/2010
www.astrosurf.com/cometas-obs
es.groups.yahoo.com/group/Cometas_Obs
- Interpretation of the FOCAS II table
headings:
-
-
- Fisrt line:
-
- OBJECT,
DATE, TIME: refering to their original meanings respectively
-
- 10x10,
20x20 ... 60x60: the aperture sizes of photometry in term of
rectangle in arcsec that are used to measure an object's magnitude
-
- SNR:
the Signal-to-Noise Ratio for aperture photometry
-
- SB:
stars of faintest magnitude on the images used in data reduction with
the used star catalog in Astrometrica, rather than the stars of faintest
magnitude in the images
-
- COD:
MPC Code of the observatory
-
-
-
- Second line:
-
- +/-:
precisions of measurement
-
- N:
the number of used images for measurement
-
- FWHM:
Full-Width-Half-Maximum of total PSF, relevant to degree of seeing
-
- CAT:
the used star catalog in Astrometrica
-
-
Weirdly, the errors in the multiboxes are
found to be even larger than yesterday. I suspect if the coma grows so large
that FocasII refused to perform photometric work in good accuaracy. But anyway,
the incline in brightness is demonstrated.
For such a bright comet, features in tails
will reveal much information of great value if pertinent knowledge in dynamics
is involved. Recently I have been reading some books and papers in the field, in
hope of application to the comet.
Copyright @ Man-To
Hui
2012/02/02
2012 Jan 30
|
The L-S filter
reveals a seemingly spiral structure formed by the dust tail toward
SE and the ion tail towards NE. So long as the resolution is
insufficiently high, this feature may well be artifact.
The observation
was influenced by clouds initially, which led to futility of many
images. As time went by the condition was turning better and better.
Mouse-over to browse the entire image without the specially-processed appendices in the
diagonal.
|
MPC observation computed with Astrometrica
using both UCAC-3 and CMC-14 star catalogs -- the former for astrometric
reduction and the latter for photometric work:
- COD C42
CON M.-T. Hui, Dept. of Physics, Wuhan University, China
OBS M.-T. Hui, X.Gao
MEA M.-T. Hui
TEL 0.107-m f/2.8 refractor + CCD
NET UCAC-3
CK09P010 KC2012 01 30.93534 17 18 27.70 +40 34 43.2
10.0 N C42
CK09P010 KC2012 01 30.94509 17 18 27.29 +40 34 59.7
C42
CK09P010 KC2012 01 30.95485 17 18 26.49 +40 35 30.1
10.0 N C42
CK09P010 KC2012 01 30.96461 17 18 25.92 +40 35 51.3
10.0 N C42
CK09P010 KC2012 01 30.97438 17 18 25.35 +40 36 14.1
10.0 N C42
CK09P010 KC2012 01 30.98416 17 18 24.77 +40 36 37.1
09.9 N C42
CK09P010 KC2012 01 30.99390 17 18 24.15 +40 37 00.4
10.0 N C42
CK09P010 KC2012 01 31.00346 17 18 23.56 +40 37 23.2
10.0 N C42
----- end -----
|
 |
-
Gaussian curve
generated by
PhAst.
- Owing to interference from clouds
during the session, FWHM appears smaller compared to the value obtained
last time.
|
-
- Photometry result computed with FOCAS II,
which processes images based upon the .LOG file of Astrometrica, by means of
Multibox method:
- COD C42
CATALOG: USNO A2.0 / CMC-14 - BAND: R
10x10 20x20 30x30
40x40 50x50 60x60
SNR SB
COD
OBJECT DATE
TIME +/- +/-
+/- +/- +/- +/-
N FWHM CAT
------------ ---------- -------- -----
----- ----- -----
----- ----- ----
---- ---
C/2009 P1 30/01/2012 23:21:03
9.97 9.27
8.84 8.56 8.34
8.18 60.6 19.2 C42
C/2009 P1 30/01/2012 23:21:03* 0.02
0.02 0.02 0.02
0.02 0.02
7 19.7 CMC
FoCAs II - 17/03/2010
www.astrosurf.com/cometas-obs
es.groups.yahoo.com/group/Cometas_Obs
- Interpretation of the FOCAS II table
headings:
-
-
- Fisrt line:
-
- OBJECT,
DATE, TIME: refering to their original meanings respectively
-
- 10x10,
20x20 ... 60x60: the aperture sizes of photometry in term of
rectangle in arcsec that are used to measure an object's magnitude
-
- SNR:
the Signal-to-Noise Ratio for aperture photometry
-
- SB:
stars of faintest magnitude on the images used in data reduction with
the used star catalog in Astrometrica, rather than the stars of faintest
magnitude in the images
-
- COD:
MPC Code of the observatory
-
-
-
- Second line:
-
- +/-:
precisions of measurement
-
- N:
the number of used images for measurement
-
- FWHM:
Full-Width-Half-Maximum of total PSF, relevant to degree of seeing
-
- CAT:
the used star catalog in Astrometrica
-
-
-
Copyright @ Man-To
Hui
2012/02/01
2012 Jan 22
|
Mouse-over to browse the entire image without the specially-processed appendix in the
upper left. |
MPC observation computed with Astrometrica
using both UCAC-3 and CMC-14 star catalogs -- the former for astrometric
reduction and the latter for photometric work:
- COD C42
CON M.-T. Hui, Dept. of Physics, Wuhan University, China
OBS M.-T. Hui, X.Gao
MEA M.-T. Hui
TEL 0.107-m f/2.8 refractor + CCD
NET UCAC-3
CK09P010 KC2012 01 22.88064 17 24 35.06 +35 46 06.9
10.2 N C42
CK09P010 KC2012 01 22.89041 17 24 34.76 +35 46 26.3
10.2 N C42
CK09P010 KC2012 01 22.90019 17 24 34.41 +35 46 45.2
10.2 N C42
CK09P010 KC2012 01 22.90997 17 24 33.94 +35 47 06.3
10.3 N C42
CK09P010 KC2012 01 22.91975 17 24 33.82 +35 47 24.0
10.2 N C42
CK09P010 KC2012 01 22.92892 17 24 33.50 +35 47 41.0
10.3 N C42
----- end -----
|
 |
-
Gaussian curve
generated by
PhAst.
|
-
- Photometry result computed with FOCAS II,
which processes images based upon the .LOG file of Astrometrica, by means of
Multibox method:
- COD C42
CATALOG: USNO A2.0 / CMC-14 - BAND: R
10x10 20x20 30x30
40x40 50x50 60x60
SNR SB
COD
OBJECT DATE
TIME +/- +/-
+/- +/- +/- +/-
N FWHM CAT
------------ ---------- -------- -----
----- ----- -----
----- ----- ----
---- ---
C/2009 P1 22/01/2012 21:43:10 10.24
9.39 8.89 8.57
8.33 8.16 91.6 19.2 C42
C/2009 P1 22/01/2012 21:43:10* 0.04
0.03 0.03 0.02
0.03 0.02
6 19.3 CMC
FoCAs II - 17/03/2010
www.astrosurf.com/cometas-obs
es.groups.yahoo.com/group/Cometas_Obs
- Interpretation of the FOCAS II table
headings:
-
-
- Fisrt line:
-
- OBJECT,
DATE, TIME: refering to their original meanings respectively
-
- 10x10,
20x20 ... 60x60: the aperture sizes of photometry in term of
rectangle in arcsec that are used to measure an object's magnitude
-
- SNR:
the Signal-to-Noise Ratio for aperture photometry
-
- SB:
stars of faintest magnitude on the images used in data reduction with
the used star catalog in Astrometrica, rather than the stars of faintest
magnitude in the images
-
- COD:
MPC Code of the observatory
-
-
-
- Second line:
-
- +/-:
precisions of measurement
-
- N:
the number of used images for measurement
-
- FWHM:
Full-Width-Half-Maximum of total PSF, relevant to degree of seeing
-
- CAT:
the used star catalog in Astrometrica
-
-
-
Copyright @ Man-To
Hui
2012/01/23
2011 Jul 01
|
Interference from
city lights, the coma as well as the tail appears much smaller than
seen from places free from light pollution. As a result, even by
employing the Larson-Sekanina filter, I still could not reveal the
comet's two tails.
Mouse-over to browse the entire image without the two
specially-processed appendices in the right. |
MPC observation computed with Astrometrica
using both UCAC-3 and CMC-14 star catalogs -- the former for astrometric
reduction and the latter for photometric work:
- COD D18
CON Man-To Hui, Dept. of Physics, Wuhan University, China
OBS M.-T. Hui, Zhu Mao
MEA M.-T. Hui
TEL 0.13-m f/5 refractor + CCD
NET UCAC-3
CK09P010 KC2011 07 01.84477 22 42 53.32 +02 49 51.6
11.8 N D18
CK09P010 KC2011 07 01.85103 22 42 52.79 +02 49 57.2
11.8 N D18
CK09P010 KC2011 07 01.85753 22 42 52.40 +02 50 03.1
11.8 N D18
----- end -----
-
- Gauss curve produced by
Astrometrica. The total PSF is using an aperture circle of
8 x
8 pixel around the brightest
pixel. We can see the Gauss curve
in the right is as the computed ideal line and the
real pixels contributed around the ideal line. The Fit RMS,
which inlays under the Gauss curve, represents the deviation from the
ideal line.
- Photometry result computed with FOCAS II,
which processes images based upon the .LOG file of Astrometrica, by means of
Multibox method:
- COD D18
CATALOG: USNO A2.0 / CMC-14 - BAND: R
10x10 20x20 30x30
40x40 50x50 60x60
SNR SB
COD
OBJECT DATE
TIME +/- +/-
+/- +/- +/- +/-
N FWHM CAT
------------ ---------- -------- -----
----- ----- -----
----- ----- ----
---- ---
C/2009 P1 01/07/2011 20:25:36 11.78 10.94 10.50 10.20
9.98 9.80 27.0 17.8 D18
C/2009 P1 01/07/2011 20:25:36* 0.01
0.03 0.04 0.04
0.05 0.06
3 7.7 CMC
FoCAs II - 17/03/2010
www.astrosurf.com/cometas-obs
es.groups.yahoo.com/group/Cometas_Obs
- Interpretation of the FOCAS II table
headings:
-
-
- Fisrt line:
-
- OBJECT,
DATE, TIME: refering to their original meanings respectively
-
- 10x10,
20x20 ... 60x60: the aperture sizes of photometry in term of
rectangle in arcsec that are used to measure an object's magnitude
-
- SNR:
the Signal-to-Noise Ratio for aperture photometry
-
- SB:
stars of faintest magnitude on the images used in data reduction with
the used star catalog in Astrometrica, rather than the stars of faintest
magnitude in the images
-
- COD:
MPC Code of the observatory
-
-
-
- Second line:
-
- +/-:
precisions of measurement
-
- N:
the number of used images for measurement
-
- FWHM:
Full-Width-Half-Maximum of total PSF, relevant to degree of seeing
-
- CAT:
the used star catalog in Astrometrica
-
-
-
Copyright @ Man-To
Hui
2011/07/13
Feel free to e-mail
me with any doubts or questions.
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