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C/2012 K5 (LINEAR)

CBET Electronic Telegram No. 3127:

An apparently asteroidal object discovered by the LINEAR survey (discovery observations tabulated below) and posted on the Minor Planet

Center's NEOCP webpage, has been found by other CCD astrometrists to show cometary appearance.  H. Sato (Tokyo, Japan; remotely with a 0.51-m f/6.8 astrograph + f/4.5 focal reducer at the RAS Observatory, ITelescope network, near Mayhill, NM, U.S.A.; May 26.42 UT) found a round 16" coma of total V-band magnitude 17.8 in a circular aperture of radius 8".2 in six stacked 60-s exposures.  E. Bryssinck (Kruibeke, Belgium, 0.4-m f/3.8 astrograph + R-band filter; May 27.0) found a condensed central condensation with a coma of diameter about 14" and a tail nearly 13" long elongated toward the southwest (p.a. 232 deg), adding that it was difficult to separate the tail from the coma in a crowded star field. ………

Photometric data obtained from FOCAS-II software

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

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

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

C/2012 K5     01/07/2012 23:46:32  16.44  15.95  15.76  15.64  15.63  15.63  17.9  18.0  B96

C/2012 K5     01/07/2012 23:46:32*  0.03   0.06   0.04   0.05   0.08   0.10     9   3.4  USN

C/2012 K5     06/07/2012 23:17:26  16.30  15.79  15.57  15.42  15.31  15.22  23.7  18.3  B96

C/2012 K5     06/07/2012 23:17:26*  0.03   0.06   0.06   0.07   0.07   0.08     8   3.7  CMC

C/2012 K5     22/07/2012 22:20:33  15.73  15.03  14.53  14.09  13.63  13.40  23.4  18.6  B96

C/2012 K5     22/07/2012 22:20:33*  0.21   0.30   0.42   0.47   0.40   0.29     6   3.2  USN

C/2012 K5     23/07/2012 22:12:24  15.77  15.22  14.98  14.83  14.73  14.66  19.0  18.5  B96

C/2012 K5     23/07/2012 22:12:24*  0.03   0.01   0.04   0.04   0.06   0.07     6   3.8  CMC

C/2012 K5     24/07/2012 23:13:55  15.83  15.35  15.16  15.01  14.91  14.84  28.1  18.3  B96

C/2012 K5     24/07/2012 23:13:55*  0.02   0.04   0.05   0.05   0.07   0.08     7   3.2  USN

C/2012 K5     26/07/2012 22:50:55  15.65  15.15  14.93  14.79  14.74  14.71  20.5  17.4  B96

C/2012 K5     26/07/2012 22:50:55*  0.03   0.06   0.09   0.11   0.13   0.16     7   3.3  USN

C/2012 K5     31/07/2012 23:13:38  15.42  14.88  14.64  14.48  14.37  14.26  13.0  17.0  B96

C/2012 K5     31/07/2012 23:13:38*  0.04   0.06   0.06   0.05   0.03   0.04     9   4.1  CMC

C/2012 K5     02/08/2012 22:21:49  15.42  14.88  14.65  14.52  14.43  14.36  17.4  17.5  B96

C/2012 K5     02/08/2012 22:21:49*  0.02   0.03   0.04   0.05   0.05   0.08     4   4.6  CMC

C/2012 K5     17/08/2012 20:55:29  14.71  14.17  13.92  13.76  13.66  13.59  26.2  18.1  B96

C/2012 K5     17/08/2012 20:55:29*  0.09   0.14   0.12   0.10   0.09   0.09     6   4.1  CMC

C/2012 K5     18/08/2012 21:12:35  14.98  14.40  14.14  13.99  13.88  13.79  24.8  18.1  B96

C/2012 K5     18/08/2012 21:12:35*  0.03   0.05   0.04   0.04   0.05   0.04     7   4.2  USN

C/2012 K5     22/08/2012 20:43:15  14.63  14.12  13.86  13.70  13.58  13.49  47.1  18.2  B96

C/2012 K5     22/08/2012 20:43:15*  0.01   0.01   0.02   0.04   0.04   0.04     9   3.9  CMC

C/2012 K5     28/08/2012 20:35:13  14.29  13.66  13.46  13.31  13.18  13.04  12.6  17.1  B96

C/2012 K5     28/08/2012 20:35:13*  0.04   0.06   0.10   0.12   0.10   0.10     2   5.3  CMC

C/2012 K5     07/09/2012 20:47:45  13.96  13.33  13.04  12.87  12.75  12.64  19.4  16.7  B96

C/2012 K5     07/09/2012 20:47:45*  0.00   0.00   0.00   0.00   0.00   0.00     1   3.9  USN

C/2012 K5     15/09/2012 19:23:22  14.16  13.54  13.25  13.07  12.93  12.81  21.9  19.6  B10

C/2012 K5     15/09/2012 19:23:22*  0.02   0.01   0.02   0.01   0.02   0.01     4   3.5  CMC

C/2012 K5     13/12/2012 11:53:55  12.34  11.38  10.92  10.63  10.43  10.28  13.5  18.9  H06

C/2012 K5     13/12/2012 11:53:55*  0.02   0.04   0.05   0.06   0.06   0.06     9   2.7  USN

C/2012 K5     17/12/2012 22:07:55  12.62  11.59  11.14  10.86  10.66  10.50  13.2  16.4  B96

C/2012 K5     17/12/2012 22:07:55*  0.07   0.01   0.00   0.00   0.00   0.00     3   3.2  USN

C/2012 K5     27/12/2012 01:11:07  11.97  11.12  10.66  10.35  10.12   9.93  12.0  16.9  I89

C/2012 K5     27/12/2012 01:11:07*  0.01   0.02   0.02   0.02   0.02   0.03    15   1.9  USN

C/2012 K5     09/01/2013 21:41:26  12.68  11.84  11.45  11.17  10.96  10.79  16.2  17.8  B96

C/2012 K5     09/01/2013 21:41:26*  0.02   0.03   0.03   0.04   0.04   0.04    20   3.5  CMC

C/2012 K5     11/01/2013 20:35:31  12.97  12.16  11.77  11.49  11.28  11.12  15.9  17.3  B96

C/2012 K5     11/01/2013 20:35:31*  0.03   0.04   0.03   0.02   0.02   0.02    20   3.7  CMC

C/2012 K5     13/01/2013 21:02:04  13.25  12.51  12.11  11.84  11.64  11.48  16.7  16.9  B96

C/2012 K5     13/01/2013 21:02:04*  0.03   0.03   0.04   0.03   0.04   0.04    12   3.0  CMC

C/2012 K5     29/01/2013 20:11:27  14.58  13.82  13.46  13.22  13.06  12.92   6.5  17.9  I89

C/2012 K5     29/01/2013 20:11:27*  0.05   0.04   0.04   0.06   0.08   0.07    15   3.6  CMC