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Comet 205P/GIACOBINI (=P/2008 R6 = D/1896 R2 (GIACOBINI))

Photometric data obtained by use of FOCAS-II software

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

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

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

205P          12/09/2008 20:17:51  14.51  13.64  13.24  12.96  12.75  12.59  11.9  15.3  B96

205P          12/09/2008 20:17:51*  0.08   0.07   0.06   0.07   0.06   0.04     4   5.7  UCA

205P          27/09/2015 01:38:29  15.88  15.11  14.72  14.47  14.27  14.14   5.0  16.4  B96

205P          27/09/2015 01:38:29*  0.11   0.11   0.10   0.08   0.06   0.04     5   3.6  USN

205P          28/09/2015 01:36:04  15.81  15.01  14.67  14.43  14.26  14.14   4.9  16.8  B96

205P          28/09/2015 01:36:04*  0.02   0.06   0.08   0.07   0.06   0.07     5   3.7  USN

205P          29/09/2015 01:28:03  15.92  15.20  14.80  14.52  14.32  14.16   4.9  16.3  B96

205P          29/09/2015 01:28:03*  0.05   0.09   0.08   0.06   0.06   0.07     6   3.6  USN

205P          04/10/2015 01:22:29  16.95  16.32  15.73  15.27  14.92  14.68   7.4  15.7  B96

205P          04/10/2015 01:22:29*  0.12   0.16   0.17   0.09   0.10   0.07     4   3.4  Gai

205P          12/10/2015 00:35:45  17.36  16.88  16.75                        3.3  16.6  B96

205P          12/10/2015 00:35:45*  0.29   0.35   0.38                          8   4.0  Gai

205P          02/11/2015 00:12:03  18.18  17.39  16.99  16.70  16.47  16.31   2.4  17.7  B96

205P          02/11/2015 00:12:03*  0.30   0.20   0.19   0.23   0.32   0.40     7   5.0  USN

                                                                     AFRHO         LOG

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

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

205P          27/09/2015 01:38:29    1.47   2.05  18.77  15.22    5     71    14  1.851  B96

205P          28/09/2015 01:36:04    1.47   2.05  18.82  15.15    5     76    15  1.879  B96

205P          29/09/2015 01:28:03    1.46   2.06  18.87  15.27    5     67    14  1.829  B96

205P          04/10/2015 01:22:29    1.43   2.08  19.25  16.22    7     28     4  1.443  B96

205P          12/10/2015 00:35:45    1.41   2.13  19.59  16.95    3     14     4  1.154  B96

205P          02/11/2015 00:12:03    1.39   2.27  19.80  17.44    2     10     4  1.006  B96

IAUC nr.8975, issued on 2008, September 10th, announces the discovery of a 15-magnitude comet by Koichi Itagaki and Hiroshi Kaneda in the Aquarius-Aquila border. It was described having a coma diameter of about 25-arcsec, and a tail 2-arcmin long pointing toward east-southeast, and assigned as comet P/2008 R6.

Maik Meyer suggested that this apparently new comet actually was a return of D/1896 R2 (Giacobini); this link was confirmed by Nakano.  This comet was alter assigned as comet 205P/GIACOBINI