Comet C/2011 A3 (Gibbs)

2011/03/06    2011/05/24

2011 May 24

 

 

Pixel size: 0".90 x 0".90

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
    CK11A030 KC2011 05 24.71312 13 08 52.90 +27 04 49.5          16.8 N      C42
    CK11A030 KC2011 05 24.73169 13 08 52.60 +27 04 42.9          16.5 N      C42
----- end -----

 

 

Gauss curve produced by Astrometrica with CMC-14. The total PSF is using an aperture circle of 10 x 10 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/2011 A3     24/05/2011 17:20:16  16.15  15.63  15.36  15.14  14.94  14.73  24.9  21.4  C42
C/2011 A3     24/05/2011 17:20:16*  0.00   0.03   0.03   0.05   0.06   0.08     2   4.4  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 2011/05/27

2011 Mar 06

MPC observation computed with Astrometrica using CMC-14 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 CMC-14
    CK11A030  C2011 03 06.77028 13 41 12.33 +22 00 46.4          17.8 N      C42
    CK11A030  C2011 03 06.77433 13 41 12.33 +22 00 48.2          17.6 N      C42
    CK11A030  C2011 03 06.77839 13 41 12.27 +22 00 50.6          17.7 N      C42
    CK11A030  C2011 03 06.78275 13 41 12.23 +22 00 52.7          17.7 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/2011 A3     06/03/2011 18:38:04  17.06  16.41  15.97  15.60  15.26  14.95  10.3  19.7  C42
C/2011 A3     06/03/2011 18:38:04*  0.03   0.07   0.08   0.07   0.05   0.03     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 2011/03/06

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

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