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 comet 329P/LINEAR-CATALINA

Photometric data obtained by use of FOCAS-II software

                                   10x10  20x20  30x30  40x40  50x50  60x60   SNR   SB   COD

COMET         UTC                    +/-    +/-    +/-    +/-    +/-    +/-     N  FWHM  CAT

------------  -------------------  -----  -----  -----  -----  -----  -----  ----  ----  ---

329P          31/12/2015 20:29:42  15.94  15.26  14.89  14.64  14.46  14.28  16.8  17.5  B96

329P          31/12/2015 20:29:42*  0.02   0.03   0.02   0.02   0.03   0.01     2   3.8  USN

329P          17/01/2016 19:40:36  16.86  16.32  16.02  15.80  15.68  15.63   3.8  17.6  B96

329P          17/01/2016 19:40:36*  0.00   0.00   0.00   0.00   0.00   0.00     1   3.8  USN

                                                                     AFRHO         LOG

COMET         UTC                   DELTA    r    BOX "   MAG   RSR    CM    +/-  AFRHO  OBS

------------  -------------------   -----  -----  -----  -----  ---  -----  ----  -----  ---

329P          31/12/2015 20:29:42    0.76   1.68  36.40  14.73   17     20     1  1.302  B96

329P          17/01/2016 19:40:36    0.88   1.73  31.18  16.02    4      9     2  0.941  B96

discovery

An apparently asteroidal object was discovered by the LINEAR project on 2003 Nov. 18 (observed on only two nights) and given the designation 2003 WC_7 (MPS 91151).  The object was discovered independently on Jan. 31 by the Catalina Sky Survey and then posted on the NEO Confirmation Page.  As a result, it has been found to show cometary appearance on CCD exposures taken by J. Young (Table Mountain, 0.6-m reflector, Feb. 1.15 UT; very diffuse coma of mag.

Recovery:

Later in 2015: PanSTARRS discovered what was thought to be an unknown 20th magnitude comet on October 10.53 and assigned as 2015 T1, though the discovery report did suggest that it might be a recovery of 2003 WC7 (P/LINEAR-Catalina). Further astrometry confirmed the identification. The indicated correction to the prediction by G. V. Williams on MPC 79352 is Delta(T) = +0.70 day17.5 and diameter 5", very little central condensation, and a straight, narrow 10" tail in p.a. 345 deg) and by G. J. Garradd and R. H. McNaught (Siding Spring, 1.0-m f/8 reflector, Feb. 1.46; coma diameter 3".5 in 2".5 seeing; no obvious tail visible in five co- added 40-s frames).