Comet P/2005 JY₁₂₆ = 2012 F4 (Catalina)

2012/03/23

2012 Mar 23

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 0.36-m f/6.9 Schmidt-Cassegrain + CCD
NET UCAC-3
    PK12F040 KC2012 03 23.83390 14 58 10.17 -13 20 11.0          19.8 N      C42
    PK12F040 KC2012 03 23.85728 14 58 09.85 -13 20 06.5          20.2 N      C42
----- end -----

 

Gaussian curve generated by PhAst. Great error due to the faintness of the target.

Photometry result computed with FOCAS II, which processes images based upon the .LOG file of Astrometrica, by means of Multibox method. Starting from 40" x 40" box to larger ones, so tremendous the errors become attributed to the dim brightness of the object that no outcome is produced by the software.

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
------------  ---------- --------  -----  -----  -----  -----  -----  -----  ----  ----  ---
P/2012 F4     23/03/2012 20:17:39  20.00  20.04  19.81                        4.8  19.4  C42
P/2012 F4     23/03/2012 20:17:39*  0.18   0.15   0.47                          2   3.6  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

 

The comet appears stellar with the same FWHM as nearby stars or asteroids of identical magnitude, lacking any hint of cometary feature. Thereby future serious examinations are desired and of great value in order to survey possible metamorphosis of the intriguing object.

Copyright @ Man-To Hui 2012/03/27

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

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