Comet 257P/2003 T12 = 2012 A3 (SOHO)

2012/01/30 2012/01/31

2012 Jan 31

Mouse-over to browse the image in 4-color sequels version attached.

Redistribution or reproduction of the image is prohibited without permission.

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 H06
OBS H. Sato
MEA M.-T. Hui
TEL 0.25-m f/3.4 reflector + CCD
NET UCAC-3
    PK03T120 KC2012 01 31.06001 23 02 18.17 -11 21 45.1                      H06
    PK03T120 KC2012 01 31.06412 23 02 19.50 -11 21 40.9          14.9 N      H06
    PK03T120 KC2012 01 31.06867 23 02 21.57 -11 21 34.1          14.9 N      H06
----- 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
------------ ---------- -------- ----- ----- ----- ----- ----- ----- ---- ---- ---
P/2003 T12    31/01/2012 01:35:36 14.87 14.04 13.70 13.42 13.27 13.21 8.6 15.7 H06
P/2003 T12    31/01/2012 01:35:36* 0.02 0.02 0.04 0.07 0.10 0.04     2 12.9 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

2012 Jan 30

This observation was performed remotely by Hidetaka Sato from Japan, remotely from H06, near Mayhill, the US. It was the first ever observation from ground-based that successfully capture the comet, which is discovered in spaceborne satellite SOHO in 2003 and recovered by Alan Watson in January 2012 in HI1b images, thus significance beyond any word. Under my request, the data was kindly sent from Hidetaka san and all the usage is within his permission. Redistribution or reproduction of these images or the following data is prohibited if there is no request beforehands.

Mouse-over to browse the image in 4-color sequels version 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 H06
OBS H. Sato
MEA M.-T. Hui
TEL 0.25-m f/3.4 reflector + CCD
NET UCAC-3
    PK03T120 KC2012 01 30.05933 22 55 58.44 -11 41 25.1          15.5 N      H06
    PK03T120 KC2012 01 30.06284 22 55 59.66 -11 41 24.5          14.8 N      H06
    PK03T120 KC2012 01 30.06635 22 56 01.11 -11 41 23.1          15.2 N      H06
----- end -----

: Photometry result computed with FOCAS II, which processes images based upon the .LOG file of Astrometrica, by means of Multibox method. The error is excessively large attributable to the low SNR of the comet. So large the error goes to, the calculation pauses to 30" x 30" box:

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/2003 T12    30/01/2012 01:30:29 15.17 14.85 14.36                      6.1 15.1 H06
P/2003 T12    30/01/2012 01:30:29* 0.28 0.54 0.44                          3 13.6 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

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

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