|
|
| Mouse-over to browse the images of azimuthal median subtraction, radial weighted model division and L-S filtered attached. |
2012/12/31 2013/01/07 2013/01/13
|
|
| Mouse-over to browse the images of azimuthal median subtraction, radial weighted model division and L-S filtered attached. |
MPC observation computed with Astrometrica using both UCAC-4 and CMC-14 star catalogs -- the former for astrometric reduction and the latter for photometric work:
COD C42
OBS X.Gao, M.-T. Hui
MEA M.-T. Hui
TEL 0.11-m f/2.8 refractor + CCD
NET UCAC-4
CK12K050 C2012 12 31.73699 06 30 50.31 +46 50 44.5 10.4 N C42
CK12K050 C2012 12 31.73916 06 30 47.49 +46 50 12.6 10.4 N C42
CK12K050 C2012 12 31.79929 06 29 28.12 +46 35 17.8 10.3 N C42
CK12K050 C2012 12 31.80161 06 29 25.12 +46 34 42.0 10.3 N C42
CK12K050 C2012 12 31.80388 06 29 22.02 +46 34 08.7 10.3 N C42
CK12K050 C2012 12 31.81509 06 29 07.41 +46 31 21.3 10.3 N C42
CK12K050 C2012 12 31.81731 06 29 04.47 +46 30 48.7 10.2 N C42
CK12K050 C2012 12 31.82052 06 29 00.21 +46 29 59.7 10.3 N C42
CK12K050 C2012 12 31.82269 06 28 57.52 +46 29 27.1 10.3 N C42
CK12K050 C2012 12 31.82958 06 28 48.47 +46 27 44.3 10.3 N C42
CK12K050 C2012 12 31.83145 06 28 46.02 +46 27 16.7 10.3 N C42
CK12K050 C2012 12 31.83539 06 28 40.86 +46 26 17.7 10.3 N C42
CK12K050 C2012 12 31.83719 06 28 38.53 +46 25 51.1 10.3 N C42
Photometry result computed with FoCAs, which processes images based upon the .LOG file of Astrometrica, by means of Multibox method:
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
I attempted to yield the magnitude of the comet enclosed by infinite box, however, only finding an excessively unreliable result of around 5 mag, which may well be attributed to severe contamination of the tail. As I could not broach any good method to eliminate the signal from the tail, I simply gave up the fitting.
 |
| Comparisons of different image enhancment techniques on the stacked comet image. Orientation is completely the same as the common stacked image as shown above. White represents the brightest region while black represents the darkest region. Upper left: azimuthal median profile divided out. Lower left: azimuthal median profile subtracted out. Upper right: 1/ρ profile, divided out. Lower right: 1/ρ profile, subtracted out. |
I also attempted to do some simple morphological analysis of the comet, by running the IDL routines written by myself, whereby we can learn that activity around P.A. 165° is significantly stronger than any other directions. Judging from images taken by other observer a day ahead when the earth passes across the orbital plane of the comet, a tail used to appear in this position angle yet quickly vanished as the geometrical conditions changes.
Copyright @ Man-To Hui 2013/01/08
|
|
| The image was stacked in median algorithm. The majority of frames were influenced by clouds more or less. For the color and average-stacked version please pay a visit here. |
MPC observation computed with Astrometrica using both UCAC-4 and CMC-14 star catalogs -- the former for astrometric reduction and the latter for photometric work:
COD XXX
OBS M.-T. Hui
MEA M.-T. Hui
TEL 0.08-m f/5.6 refractor + CCD
NET UCAC-4
CK12K050 C2013 01 07.59656 05 00 22.11 +19 38 04.1 11.4 N XXX
CK12K050 C2013 01 07.60510 05 00 18.30 +19 36 26.1 11.4 N XXX
CK12K050 C2013 01 07.60581 05 00 17.85 +19 36 18.2 11.3 N XXX
CK12K050 C2013 01 07.60652 05 00 17.55 +19 36 09.5 11.2 N XXX
CK12K050 C2013 01 07.60722 05 00 17.28 +19 36 03.6 11.4 N XXX
CK12K050 C2013 01 07.60793 05 00 16.99 +19 35 53.7 11.3 N XXX
CK12K050 C2013 01 07.60934 05 00 16.27 +19 35 36.2 11.3 N XXX
CK12K050 C2013 01 07.61005 05 00 15.94 +19 35 28.4 11.3 N XXX
CK12K050 C2013 01 07.61075 05 00 15.74 +19 35 21.6 11.4 N XXX
CK12K050 C2013 01 07.61216 05 00 15.10 +19 35 05.5 11.4 N XXX
CK12K050 C2013 01 07.61358 05 00 14.45 +19 34 50.1 11.4 N XXX
CK12K050 C2013 01 07.61428 05 00 13.90 +19 34 40.1 11.4 N XXX
CK12K050 C2013 01 07.61499 05 00 13.65 +19 34 31.9 11.3 N XXX
CK12K050 C2013 01 07.61569 05 00 13.39 +19 34 22.8 11.2 N XXX
CK12K050 C2013 01 07.61640 05 00 13.08 +19 34 15.8 11.4 N XXX
CK12K050 C2013 01 07.61711 05 00 12.75 +19 34 06.6 11.3 N XXX
CK12K050 C2013 01 07.61935 05 00 11.85 +19 33 42.2 11.4 N XXX
CK12K050 C2013 01 07.62006 05 00 11.50 +19 33 34.6 11.4 N XXX
CK12K050 C2013 01 07.62076 05 00 11.21 +19 33 23.4 11.4 N XXX
CK12K050 C2013 01 07.62147 05 00 10.92 +19 33 17.7 11.4 N XXX
CK12K050 C2013 01 07.62218 05 00 10.63 +19 33 10.4 11.5 N XXX
CK12K050 C2013 01 07.62288 05 00 10.14 +19 33 00.7 11.3 N XXX
Photometry result computed with FoCAs, which processes images based upon the .LOG file of Astrometrica, by means of Multibox method:
Fisrt line:
Copyright @ Man-To Hui 2013/01/19
|
|
| Mouse-over to browse the images of special cometary processing techniques attached. For the color version please pay a visit here. |
MPC observation computed with Astrometrica using both UCAC-4 and CMC-14 star catalogs -- the former for astrometric reduction and the latter for photometric work:
COD XXX
OBS M.-T. Hui
MEA M.-T. Hui
TEL 0.08-m f/5.6 refractor + CCD
NET UCAC-4
CK12K050 KC2013 01 13.53133 04 30 08.66 +05 07 36.7 11.9 N XXX
CK12K050 KC2013 01 13.53434 04 30 08.13 +05 07 21.0 12.1 N XXX
CK12K050 KC2013 01 13.53716 04 30 07.47 +05 07 02.9 12.1 N XXX
CK12K050 KC2013 01 13.53999 04 30 07.08 +05 06 45.8 12.1 N XXX
CK12K050 KC2013 01 13.54281 04 30 06.28 +05 06 27.1 12.1 N XXX
CK12K050 KC2013 01 13.54564 04 30 05.68 +05 06 06.7 12.0 N XXX
CK12K050 KC2013 01 13.54846 04 30 05.13 +05 05 51.4 12.0 N XXX
CK12K050 KC2013 01 13.55128 04 30 04.44 +05 05 30.1 12.0 N XXX
CK12K050 KC2013 01 13.55411 04 30 03.83 +05 05 14.4 12.1 N XXX
CK12K050 KC2013 01 13.55693 04 30 03.33 +05 04 56.3 12.1 N XXX
CK12K050 KC2013 01 13.55976 04 30 02.60 +05 04 37.8 12.1 N XXX
CK12K050 KC2013 01 13.56258 04 30 02.20 +05 04 19.9 12.1 N XXX
CK12K050 KC2013 01 13.56541 04 30 01.64 +05 04 01.9 12.1 N XXX
CK12K050 KC2013 01 13.56823 04 30 01.00 +05 03 44.2 12.1 N XXX
CK12K050 KC2013 01 13.57105 04 30 00.46 +05 03 26.3 11.9 N XXX
CK12K050 KC2013 01 13.57388 04 29 59.77 +05 03 10.2 12.0 N XXX
CK12K050 KC2013 01 13.57670 04 29 59.25 +05 02 48.8 12.0 N XXX
CK12K050 KC2013 01 13.57953 04 29 58.71 +05 02 34.0 12.1 N XXX
CK12K050 KC2013 01 13.58235 04 29 58.01 +05 02 12.8 12.1 N XXX
CK12K050 KC2013 01 13.58517 04 29 57.49 +05 01 53.1 12.0 N XXX
CK12K050 KC2013 01 13.58800 04 29 56.87 +05 01 37.7 11.9 N XXX
CK12K050 KC2013 01 13.59082 04 29 56.58 +05 01 18.3 12.1 N XXX
CK12K050 KC2013 01 13.59365 04 29 55.76 +05 01 02.9 11.9 N XXX
CK12K050 KC2013 01 13.59647 04 29 54.99 +05 00 41.3 11.9 N XXX
CK12K050 KC2013 01 13.59929 04 29 54.77 +05 00 26.9 11.9 N XXX
CK12K050 KC2013 01 13.60804 04 29 52.66 +04 59 27.8 11.9 N XXX
CK12K050 KC2013 01 13.61087 04 29 52.16 +04 59 14.6 11.9 N XXX
CK12K050 KC2013 01 13.61369 04 29 51.39 +04 58 50.9 11.9 N XXX
CK12K050 KC2013 01 13.61652 04 29 50.69 +04 58 33.9 11.8 N XXX
CK12K050 KC2013 01 13.61934 04 29 50.26 +04 58 13.3 11.8 N XXX
CK12K050 KC2013 01 13.62216 04 29 50.02 +04 57 56.1 11.7 N XXX
CK12K050 KC2013 01 13.62499 04 29 49.08 +04 57 42.2 11.8 N XXX
CK12K050 KC2013 01 13.63346 04 29 47.55 +04 56 45.0 11.8 N XXX
CK12K050 KC2013 01 13.63628 04 29 47.05 +04 56 28.1 11.8 N XXX
CK12K050 KC2013 01 13.63911 04 29 46.39 +04 56 13.2 11.8 N XXX
CK12K050 KC2013 01 13.64193 04 29 45.51 +04 55 51.0 11.8 N XXX
CK12K050 KC2013 01 13.64476 04 29 44.72 +04 55 29.3 11.9 N XXX
CK12K050 KC2013 01 13.64795 04 29 44.48 +04 55 11.6 11.9 N XXX
CK12K050 KC2013 01 13.65113 04 29 44.18 +04 54 56.2 12.2 N XXX
CK12K050 KC2013 01 13.65396 04 29 43.61 +04 54 37.9 12.1 N XXX
CK12K050 KC2013 01 13.65678 04 29 42.26 +04 54 17.6 12.0 N XXX
CK12K050 KC2013 01 13.65961 04 29 41.97 +04 53 59.6 12.1 N XXX
CK12K050 KC2013 01 13.66243 04 29 41.68 +04 53 45.0 12.1 N XXX
CK12K050 KC2013 01 13.66525 04 29 41.08 +04 53 24.6 12.0 N XXX
CK12K050 KC2013 01 13.66808 04 29 40.13 +04 53 03.7 11.9 N XXX
Photometry result computed with FoCAs, which processes images based upon the .LOG file of Astrometrica, by means of Multibox method:
OBJECT, DATE, TIME: refering to their original meanings respectivelyFisrt line:
As one may be aware of the plot of the lightcurve, it seems that the intrinsic variation has been presented. However, since I have not yet seen reports from other observers, it may reflect sky background variation between the spell when the comet was photographed. It would be a very interesting phenomenon to be verified. Nevertheless I will keep on the monitoring work of this comet, weather permitting.
 |
| Comparisons of different image enhancment techniques on the stacked comet image. Orientation is completely the same as the common stacked image as shown above. White represents the brightest region while black represents the darkest region. Please note that the stretching scales between each image is not the same. Upper left: 1/ρ profile, subtracted out. Upper right: 1/ρ profile, divided out. Lower left: azimuthal median profile subtracted out. Lower right: azimuthal median profile divided out. |
Copyright @ Man-To Hui 2013/01/19
Feel free to e-mail me with any doubts or questions.
