Comet 240P/NEAT

in 2011

2011/04/07

2011 Apr 07

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
0240P        KC2011 04 07.61346 07 04 42.36 +42 42 19.7          16.5 N      C42
0240P        KC2011 04 07.61855 07 04 42.89 +42 42 18.5          15.6 N      C42
0240P        KC2011 04 07.62363 07 04 43.39 +42 42 17.1          15.7 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
------------  ---------- --------  -----  -----  -----  -----  -----  -----  ----  ----  ---
240P          07/04/2011 14:50:42  15.84  15.52  15.34  15.20  15.08  14.96  51.9  19.4  C42
240P          07/04/2011 14:50:42*  0.00   0.02   0.03   0.03   0.02   0.02     3   3.8  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 2011/04/10

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

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