Comet C/2012 C2 (Bruenjes)

2012/02/14

2012 Feb 14

Mouse-over to browse the image in 4-color sequels version with L-S filtered one attached.

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
    CK12C020 KC2012 02 14.58193 01 46 04.91 +17 42 34.5          15.7 N      C42
    CK12C020 KC2012 02 14.58444 01 46 04.28 +17 42 33.0          15.7 N      C42
    CK12C020 KC2012 02 14.58696 01 46 03.85 +17 42 31.9          15.7 N      C42
    CK12C020 KC2012 02 14.58947 01 46 03.26 +17 42 30.2                      C42
    CK12C020 KC2012 02 14.59196 01 46 02.77 +17 42 29.3          15.7 N      C42
----- end -----

: 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/2012 C2     14/02/2012 14:04:18 15.68 14.66 14.10 13.72 13.46 13.25 20.1 19.8 C42
C/2012 C2     14/02/2012 14:04:18* 0.02 0.04 0.04 0.02 0.01 0.00     4 3.9 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

As time passed by, the comet was proved to have underwent an outburst, which directly led to the discovery of the comet, as its coma kept expanding and now it has already become very diffuse without any noticeable bright central condensation. Another observation in our observatory of this comet was performed by another member, Zhijian Xu. Even in his stacked image with registration to the cometary motion, the comet failed to be captured with very hint.

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

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