Comet C/2005 L3 (McNaught)

 

2011/03/20        2011/03/21

 

2011 Mar 21
2011/03/21 14:44:34 UT - 15:23:05 UT, 14" SCT f/6.9 + QHY9 CCD, BIN 2x2 90 sec x 12 exposure, north up and east left
 

MPC observation computed with Astrometrica using UCAC-3 star catalog in R band:

COD C42
OBS X.Gao, M.-T. Hui
MEA M.-T. Hui
TEL 0.36-m f/6.9 Schmidt-Cassegrain + CCD
NET UCAC-3
    CK05L030 KC2011 03 21.61598 11 05 10.55 +42 35 27.8          19.3 N      C42
    CK05L030 KC2011 03 21.62442 11 05 10.07 +42 35 28.0          19.0 N      C42
    CK05L030 KC2011 03 21.63245 11 05 09.75 +42 35 27.9          18.5 N      C42
    CK05L030 KC2011 03 21.64039 11 05 09.33 +42 35 28.2          18.3 N      C42
----- end -----

 

 
Gauss curve produced by Astrometrica with CMC-14. The total PSF is using an aperture circle of 5 x 5 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, is 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 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/2005 L3     21/03/2011 15:04:46  17.52  16.55  16.05  15.73  15.48  15.26   4.5  19.3  C42
C/2005 L3     21/03/2011 15:04:46*  0.04   0.08   0.09   0.12   0.16   0.23     4   3.4  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 2011/03/22

 

2011 Mar 20
2011/03/20 14:48:44 UT - 15:28:14 UT, 14" SCT f/6.9 + QHY9 CCD, BIN 2x2 90 sec x 9 exposure, north up and east left
 

MPC observation computed with Astrometrica using UCAC-2 star catalog in R band:

COD C42
OBS X.Gao, M.-T. Hui
MEA M.-T. Hui
TEL 0.36-m f/6.9 Schmidt-Cassegrain + CCD
NET UCAC-2
    CK05L030 KC2011 03 20.61897 11 05 54.65 +42 34 38.3          18.3 N      C42
    CK05L030 KC2011 03 20.63221 11 05 54.03 +42 34 38.4          18.9 N      C42
    CK05L030 KC2011 03 20.64381 11 05 53.46 +42 34 39.4          18.9 N      C42
----- end -----

 

 
Gauss curve produced by Astrometrica with CMC-14. The total PSF is using an aperture circle of 5 x 5 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, is 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 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/2005 L3     20/03/2011 15:09:35  17.76  16.85  16.46  16.28  16.21  16.24   3.6  18.1  C42
C/2005 L3     20/03/2011 15:09:35*  0.14   0.12   0.19   0.25   0.26   0.29     3   3.5  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 2011/03/20

Feel free to e-mail me with any doubts or questions.

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