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162P/SIDING SPRING  (=P/2004 TU_12)

CBET 8436: COMET P/2004 TU_12 (SIDING SPRING)

An apparently asteroidal object discovered on Oct. 10 by the Siding Spring Survey (announced as 2004 TU_12 on MPEC 2004-T55; discovery observation below) has been found to show a short eastward tail.  CCD images taken over 2.5 hr with the 0.36-m

"SoTIE" reflector at Las Campanas by F. Mallia, G. Masi, and R. Wilcox on Nov. 12.0 UT show a tail about 2' long in p.a. 70 deg (the "head" appearing like stars in the field (FWHM about 3").  Eighty 30-s CCD images taken on Nov. 12.8 by J. Lacruz (La Canada, Spain) show a sharp tail 4' long in p.a. 69 deg (and total mag 14.3

Photometric data obtained by use of FOCAS-II software

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

OBJECT        DATE       TIME        +/-    +/-    +/-    +/-    +/-    +/-     N  FWHM  CAT

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

162P          27/09/2015 02:09:45  17.27  17.15  17.06  17.05  17.01  16.79   5.8  16.6  B96

162P          27/09/2015 02:09:45*  0.04   0.19   0.04   0.07   0.28   0.17     3   3.7  USN

162P          29/09/2015 02:00:16  17.00  16.81  16.44  15.95  15.54  15.31   6.3  16.6  B96

162P          29/09/2015 02:00:16*  0.04   0.25   0.40   0.32   0.26   0.16     3   3.6  USN

162P          02/10/2015 02:03:21  18.10  17.82  17.76  17.34  17.32          3.6  17.1  B96

162P          02/10/2015 02:03:21*  0.18   0.28   0.23   0.16   0.43            3   3.5  USN

162P          18/01/2016 01:34:38  17.40  17.30  17.40  17.42  17.31  17.15  18.4  18.2  B96

162P          18/01/2016 01:34:38*  0.00   0.00   0.00   0.00   0.00   0.00     1   3.7  USN

                                                                     AFRHO         LOG

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

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

162P          27/09/2015 02:09:45    1.70   1.52  16.21  17.19    6      9     1  0.934  B96

162P          29/09/2015 02:00:16    1.70   1.54  16.21  16.78    6     13     2  1.107  B96

162P          02/10/2015 02:03:21    1.70   1.56  16.22  17.91    4      5     1  0.666  B96

162P          18/01/2016 01:34:38    1.57   2.32  17.54  17.37   18     14     1  1.160  B96