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230P/LINEAR - (P/2009 U6 = P/2002 Q15 (linear) = 1997 A2)

Photometric data obtained by use of FOCAS-II software

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

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

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

230P          27/10/2015 01:26:27  16.08  15.75  15.56  15.41  15.27  15.17   9.5  16.3  B96

230P          27/10/2015 01:26:27*  0.05   0.07   0.06   0.06   0.09   0.16     3   3.5  USN

230P          31/12/2015 20:03:11  14.30  13.88  13.70  13.57  13.49  13.43  57.8  17.3  B96

230P          31/12/2015 20:03:11*  0.00   0.01   0.00   0.01   0.01   0.02     3   3.9  USN

230P          08/01/2016 22:42:45  14.88  14.46  14.25  14.12  14.05  14.03  57.3  18.1  B96

230P          08/01/2016 22:42:45*  0.00   0.01   0.01   0.02   0.02   0.02     3   3.4  USN

230P          17/01/2016 19:52:00  15.72  15.21  14.90  14.63  14.34         38.8  18.0  B96

230P          17/01/2016 19:52:00*  0.02   0.04   0.03   0.02   0.01            4   3.8  USN

                                                                     AFRHO         LOG

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

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

230P          27/10/2015 01:26:27    0.65   1.50  42.17  15.37   10      7     1  0.821  B96

230P          31/12/2015 20:03:11    0.61   1.55  44.96  13.53   58     34     1  1.529  B96

81P           08/01/2016 23:01:07    1.47   2.38  18.70  14.87   31    134     4  2.127  B96

230P          17/01/2016 19:52:00    0.73   1.62  37.93  14.65   39     18     0  1.264  B96

An apparently asteroidal object of 18th magnitude discovered by LINEAR with the 1.0-m reflector on 1997 October 27.43 was found to show a cometary appearance by other astrometrists, The comet was at perihelion at 1.5 AU in early August and has a period of around 6.3 years.

Following improved astrometry S. Nakano identified observations of the comet among single-night data from NEAT at the two preceding apparitions in 1997 and 2002, with it being assigned the identifications 1997 A2 and 2002 Q15. Rob Matson independently located the images corresponding to these observations, together with some additional ones and provided measurements. The comet's approach to a distance of 0.88 AU from Jupiter in September 2007 means that the orbital period, currently 6.27 years, was previously 6.48-6.49 years, with the comet's previous two perihelion passages occurring on 2003 Mar. 3 and 1996 Sept. 4.