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Comet C/2015 ER61  (PANSTARRS)

Photometric data obtained from FOCAS-II software

COD B96

CON BRIXIIS Observatory - Eyckensbeekstraat 2, B-9150 Kruibeke, Belgium

CATALOG: USNO A2.0 / CMC-14 - BAND: R

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

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

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

C/2015 ER61   17/05/2017 09:51:57  12.10  11.07  10.55  10.21   9.96   9.77  18.8  16.8  G39

C/2015 ER61   17/05/2017 09:51:57*  0.14   0.18   0.22   0.25   0.26   0.27     7   3.9  CMC

C/2015 ER61   18/05/2017 09:50:56  12.26  11.17  10.65  10.32  10.08   9.89  13.7  18.1  G39

C/2015 ER61   18/05/2017 09:50:56*  0.18   0.27   0.32   0.36   0.39   0.40     4   3.5  CMC

C/2015 ER61   19/05/2017 09:53:57  12.20  11.11  10.57  10.22   9.96   9.77  17.2  18.3  G39

C/2015 ER61   19/05/2017 09:53:57*  0.01   0.02   0.03   0.02   0.03   0.03     6   3.5  CMC

C/2015 ER61   20/05/2017 09:51:54  12.27  11.20  10.67  10.31  10.06   9.85  15.2  16.7  G39

C/2015 ER61   20/05/2017 09:51:54*  0.03   0.05   0.06   0.06   0.05   0.05     9   3.7  CMC

C/2015 ER61   24/05/2017 09:55:13  12.38  11.39  10.88  10.55  10.31  10.12  15.5  18.3  G39

C/2015 ER61   24/05/2017 09:55:13*  0.10   0.15   0.18   0.21   0.23   0.25     7   4.0  CMC

C/2015 ER61   29/05/2017 09:56:01  12.38  11.39  10.89  10.56  10.32  10.13  22.8  18.8  G39

C/2015 ER61   29/05/2017 09:56:01*  0.05   0.09   0.11   0.13   0.14   0.16     9   3.7  CMC

C/2015 ER61   02/06/2017 09:54:17  12.39  11.30  10.76  10.40  10.15   9.97  16.3  18.8  G39

C/2015 ER61   02/06/2017 09:54:17*  0.03   0.04   0.04   0.04   0.04   0.04     6   3.5  CMC

C/2015 ER61   03/06/2017 09:52:05  12.50  11.44  10.91  10.57  10.32  10.14  15.6  18.7  G39

C/2015 ER61   03/06/2017 09:52:05*  0.10   0.14   0.17   0.19   0.21   0.22     4   3.6  CMC

C/2015 ER61   10/06/2017 09:57:10  12.82  11.82  11.32  11.00  10.76  10.57  14.7  17.4  G39

C/2015 ER61   10/06/2017 09:57:10*  0.07   0.13   0.16   0.18   0.20   0.21    11   3.8  CMC

C/2015 ER61   11/06/2017 09:58:40  12.90  11.91  11.40  11.08  10.85  10.66  13.0  17.9  G39

C/2015 ER61   11/06/2017 09:58:40*  0.12   0.16   0.19   0.23   0.25   0.27     3   4.1  CMC

C/2015 ER61   12/06/2017 10:01:33  12.88  11.81  11.29  10.96  10.72  10.53  14.9  17.9  G39

C/2015 ER61   12/06/2017 10:01:33*  0.12   0.14   0.17   0.19   0.21   0.22     4   3.6  CMC

C/2015 ER61   13/06/2017 10:00:37  12.89  11.88  11.35  11.01  10.77  10.58  18.3  18.2  G39

C/2015 ER61   13/06/2017 10:00:37*  0.12   0.10   0.11   0.14   0.15   0.17     4   3.9  CMC

C/2015 ER61   14/06/2017 10:10:42  12.89  11.84  11.32  10.99  10.74  10.55  16.1  17.7  G39

C/2015 ER61   14/06/2017 10:10:42*  0.12   0.13   0.17   0.20   0.22   0.24     4   3.7  CMC

C/2015 ER61   15/06/2017 10:09:48  12.93  11.95  11.44  11.10  10.85  10.67  18.8  18.0  G39

C/2015 ER61   15/06/2017 10:09:48*  0.13   0.18   0.21   0.23   0.24   0.26     4   4.1  CMC

C/2015 ER61   16/06/2017 09:49:56  13.01  12.04  11.51  11.16  10.91  10.71  21.4  18.5  G39

C/2015 ER61   16/06/2017 09:49:56*  0.02   0.04   0.04   0.04   0.04   0.03     9   3.9  CMC

C/2015 ER61x  16/06/2017 09:49:56  13.81  12.52                               3.0  18.5  G39

C/2015 ER61x  16/06/2017 09:49:56*  0.07   0.06                                 9   3.9  CMC

C/2015 ER61   17/06/2017 09:46:45  12.99  11.98  11.45  11.10  10.85  10.66  15.4  18.6  G39

C/2015 ER61   17/06/2017 09:46:45*  0.01   0.01   0.01   0.02   0.02   0.02     5   3.8  CMC

C/2015 E61b   17/06/2017 09:46:45  13.82  12.50                               2.4  18.6  G39

C/2015 E61b   17/06/2017 09:46:45*  0.01   0.06                                 5   3.8  CMC

C/2015 E61b   18/06/2017 09:51:04  13.87  12.57                               3.6  17.9  G39

C/2015 E61b   18/06/2017 09:51:04*  0.14   0.13                                 6   3.9  CMC

C/2015 ER61   18/06/2017 09:51:04  13.08  12.08  11.56  11.22  10.98  10.79  15.2  17.9  G39

C/2015 ER61   18/06/2017 09:51:04*  0.09   0.08   0.10   0.12   0.14   0.15     6   3.9  CMC

C/2015 E61b   19/06/2017 09:51:11  13.99  12.70                               4.1  18.4  G39

C/2015 E61b   19/06/2017 09:51:11*  0.20   0.26                                 5   4.0  CMC

C/2015 ER61   19/06/2017 09:50:58  13.10  12.13  11.61  11.27  11.02  10.82  14.7  18.3  G39

C/2015 ER61   19/06/2017 09:50:58*  0.11   0.18   0.23   0.24   0.25   0.26     7   3.9  CMC

C/2015 E61b   20/06/2017 09:47:54  14.02  12.72  12.03  11.57  11.26  11.04   2.6  17.6  G39

C/2015 E61b   20/06/2017 09:47:54*  0.29   0.33   0.33   0.34   0.35   0.36     2   3.6  CMC

C/2015 ER61   20/06/2017 09:47:47  13.23  12.22  11.74  11.43  11.21  11.05  14.5  17.6  G39

C/2015 ER61   20/06/2017 09:47:47*  0.16   0.25   0.34   0.39   0.43   0.47     8   3.5  CMC

C/2015 ER61   21/06/2017 09:53:30  13.24  12.19  11.67  11.33  11.08  10.89  13.2  18.9  G39

C/2015 ER61   21/06/2017 09:53:30*  0.12   0.18   0.22   0.25   0.27   0.28     5   3.6  CMC

C/2015 ER61   22/06/2017 20:46:05  13.27  12.25  11.74  11.40  11.15  10.96  13.7  19.1  G39

C/2015 ER61   22/06/2017 20:46:05*  0.12   0.18   0.21   0.24   0.25   0.26    22   3.7  CMC

C/2015 ER61   23/06/2017 09:51:21  13.27  12.22  11.71  11.37  11.13  10.94  13.5  19.0  G39

C/2015 ER61   23/06/2017 09:51:21*  0.11   0.15   0.20   0.22   0.24   0.25     5   3.5  CMC

C/2015 ER61   24/06/2017 09:51:19  13.35  12.42  11.93  11.60  11.35  11.16  15.1  19.3  G39

C/2015 ER61   24/06/2017 09:51:19*  0.10   0.12   0.15   0.18   0.20   0.21     5   4.1  CMC

C/2015 ER61   25/06/2017 09:51:58  13.38  12.37  11.86  11.52  11.28  11.09  15.0  19.2  G39

C/2015 ER61   25/06/2017 09:51:58*  0.09   0.11   0.13   0.15   0.17   0.18     6   3.5  CMC

C/2015 ER61   26/06/2017 09:51:01  13.38  12.33  11.84  11.51  11.27  11.07  11.4  18.6  G39

C/2015 ER61   26/06/2017 09:51:01*  0.08   0.12   0.16   0.18   0.19   0.20     8   3.5  CMC

C/2015 ER61   29/06/2017 09:51:27  13.54  12.53  12.04  11.73  11.49  11.30  12.7  19.3  G39

C/2015 ER61   29/06/2017 09:51:27*  0.12   0.15   0.18   0.21   0.24   0.25     5   3.5  CMC

C/2015 ER61   30/06/2017 09:51:32  13.54  12.62  12.15  11.83  11.60  11.40  15.7  19.4  G39

C/2015 ER61   30/06/2017 09:51:32*  0.08   0.09   0.11   0.13   0.14   0.15     7   3.9  CMC

C/2015 ER61   02/07/2017 09:52:16  13.61  12.65  12.18  11.86  11.63  11.45  16.3  19.4  G39

C/2015 ER61   02/07/2017 09:52:16*  0.08   0.10   0.13   0.15   0.15   0.16     9   3.6  CMC

C/2015 ER61   03/07/2017 09:54:09  13.54  12.61  12.13  11.81  11.58  11.40  10.8  19.4  G39

C/2015 ER61   03/07/2017 09:54:09*  0.02   0.01   0.03   0.03   0.03   0.03     2   3.7  CMC

C/2015 ER61   04/07/2017 09:51:58  13.62  12.62  12.14  11.82  11.57  11.38  15.8  19.3  G39

C/2015 ER61   04/07/2017 09:51:58*  0.03   0.04   0.04   0.03   0.03   0.03     3   3.5  CMC

C/2015 ER61   05/07/2017 09:52:58  13.65  12.64  12.15  11.83  11.60  11.41  15.0  19.3  G39

C/2015 ER61   05/07/2017 09:52:58*  0.01   0.01   0.02   0.02   0.02   0.02     3   3.5  CMC

C/2015 ER61   06/07/2017 09:52:00  13.68  12.65  12.14  11.82  11.59  11.40  14.7  19.3  G39

C/2015 ER61   06/07/2017 09:52:00*  0.06   0.13   0.15   0.15   0.15   0.15     3   3.5  CMC

C/2015 ER61   07/07/2017 09:53:01  13.72  12.64  12.15  11.83  11.60  11.40  11.3  18.9  G39

C/2015 ER61   07/07/2017 09:53:01*  0.10   0.12   0.14   0.15   0.15   0.16     7   3.4  CMC

C/2015 ER61   08/07/2017 09:53:19  13.84  12.85  12.35  12.03  11.76  11.56  14.0  18.0  G39

C/2015 ER61   08/07/2017 09:53:19*  0.08   0.10   0.12   0.14   0.16   0.17     6   3.5  CMC

C/2015 ER61   09/07/2017 09:54:15  13.82  12.78  12.31  11.98  11.73  11.51  11.5  17.5  G39

C/2015 ER61   09/07/2017 09:54:15*  0.11   0.20   0.23   0.24   0.26   0.27     6   3.5  CMC

C/2015 ER61   10/07/2017 09:51:29  13.83  12.79  12.34  12.04  11.80  11.61  10.2  17.8  G39

C/2015 ER61   10/07/2017 09:51:29*  0.11   0.18   0.22   0.24   0.26   0.28     9   3.4  CMC

C/2015 ER61   11/07/2017 09:53:52  13.98  13.01  12.56  12.25  11.99  11.79  11.5  18.1  G39

C/2015 ER61   11/07/2017 09:53:52*  0.07   0.08   0.11   0.13   0.15   0.16     7   3.6  CMC

C/2015 ER61   12/07/2017 09:54:08  13.97  12.95  12.48  12.17  11.92  11.72  11.2  18.0  G39

C/2015 ER61   12/07/2017 09:54:08*  0.08   0.12   0.14   0.16   0.17   0.17     7   3.5  CMC

C/2015 ER61   13/07/2017 09:54:09  14.00  13.01  12.55  12.25  12.01  11.82  11.8  18.2  G39

C/2015 ER61   13/07/2017 09:54:09*  0.07   0.09   0.11   0.13   0.14   0.16     7   3.6  CMC

C/2015 ER61   06/08/2017 00:09:41  14.63  13.73  13.31  13.01  12.81  12.69  11.2  15.3  B96

C/2015 ER61   06/08/2017 00:09:41*  0.00   0.00   0.00   0.00   0.00   0.00     1   4.3  CMC

C/2015 ER61   23/09/2017 22:28:04  15.57  14.90  14.52  14.26  14.14          3.8  15.2  B96

C/2015 ER61   23/09/2017 22:28:04*  0.08   0.15   0.12   0.12   0.07            4   4.0  CMC

C/2015 ER61   24/09/2017 22:26:12  15.20  14.61  14.32  14.24  14.31          4.1  14.8  B96

C/2015 ER61   24/09/2017 22:26:12*  0.20   0.15   0.10   0.09   0.09            3   3.9  CMC

C/2015 ER61   15/10/2017 00:08:54  15.64  15.05  14.74  14.50  14.32  14.20  22.6  18.1  B96

C/2015 ER61   15/10/2017 00:08:54*  0.01   0.02   0.03   0.02   0.03   0.03     4   3.8  USN

C/2015 ER61   16/10/2017 00:30:03  15.55  14.96  14.64  14.47  14.40  14.36  16.0  17.1  B96

C/2015 ER61   16/10/2017 00:30:03*  0.04   0.02   0.06   0.11   0.18   0.27     2   3.9  USN

C/2015 ER61   21/10/2017 21:24:29  15.53  14.92  14.58  14.36  14.21  14.13  18.9  17.1  B96

C/2015 ER61   21/10/2017 21:24:29*  0.01   0.04   0.03   0.04   0.04   0.03     4   3.9  CMC

C/2015 ER61   13/11/2017 22:31:00  15.64  14.98  14.69  14.46  14.30  14.21  20.4  17.9  B96

C/2015 ER61   13/11/2017 22:31:00*  0.01   0.04   0.01   0.01   0.02   0.05     2   3.6  USN

                                                                     AFRHO         LOG

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

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

C/2015 ER61   17/05/2017 09:51:57    1.28   1.05  21.56  11.04   19    667    35  2.824  G39

C/2015 ER61   18/05/2017 09:50:56    1.29   1.05  21.45  11.17   14    600    44  2.778  G39

C/2015 ER61   19/05/2017 09:53:57    1.29   1.05  21.35  11.10   17    649    38  2.812  G39

C/2015 ER61   20/05/2017 09:51:54    1.30   1.06  21.25  11.19   15    605    40  2.782  G39

C/2015 ER61   24/05/2017 09:55:13    1.32   1.07  20.83  11.40   16    534    34  2.727  G39

C/2015 ER61   29/05/2017 09:56:01    1.36   1.09  20.31  11.43   23    565    25  2.752  G39

C/2015 ER61   02/06/2017 09:54:17    1.39   1.11  19.91  11.38   16    641    39  2.807  G39

C/2015 ER61   03/06/2017 09:52:05    1.39   1.12  19.81  11.52   16    573    37  2.758  G39

C/2015 ER61   10/06/2017 09:57:10    1.44   1.17  19.16  11.94   15    454    31  2.657  G39

C/2015 ER61   11/06/2017 09:58:40    1.45   1.17  19.07  12.03   13    427    33  2.631  G39

C/2015 ER61   12/06/2017 10:01:33    1.45   1.18  18.99  11.96   15    465    31  2.668  G39

C/2015 ER61   13/06/2017 10:00:37    1.46   1.19  18.90  12.01   18    456    25  2.659  G39

C/2015 ER61   14/06/2017 10:10:42    1.47   1.20  18.82  11.99   16    472    29  2.674  G39

C/2015 ER61   15/06/2017 10:09:48    1.47   1.21  18.73  12.08   19    444    24  2.648  G39

C/2015 ER61   16/06/2017 09:49:56    1.48   1.21  18.66  12.17   21    421    20  2.624  G39

C/2015 E61b  Not enough boxes

C/2015 ER61   17/06/2017 09:46:45    1.48   1.22  18.58  12.13   15    446    29  2.649  G39

C/2015 E61b   Not enough boxesC/2015 E61b   Not enough boxes

C/2015 ER61   18/06/2017 09:51:04    1.49   1.23  18.50  12.23   15    413    27  2.616  G39

C/2015 E61b   Not enough boxes

C/2015 ER61   19/06/2017 09:50:58    1.50   1.24  18.42  12.28   15    406    28  2.609  G39

C/2015 E61b   Orbital elements not found

C/2015 ER61   20/06/2017 09:47:47    1.50   1.25  18.35  12.41   15    368    25  2.566  G39

C/2015 ER61   21/06/2017 09:53:30    1.51   1.26  18.27  12.38   13    386    29  2.587  G39

C/2015 ER61   22/06/2017 20:46:05    1.52   1.27  18.17  12.44   14    378    28  2.577  G39

C/2015 ER61   23/06/2017 09:51:21    1.52   1.27  18.13  12.42   14    388    29  2.588  G39

C/2015 ER61   24/06/2017 09:51:19    1.53   1.28  18.07  12.59   15    341    23  2.533  G39

C/2015 ER61   25/06/2017 09:51:58    1.53   1.29  18.00  12.57   15    355    24  2.550  G39

C/2015 ER61   26/06/2017 09:51:01    1.54   1.30  17.93  12.56   11    366    32  2.564  G39

C/2015 ER61   29/06/2017 09:51:27    1.55   1.33  17.75  12.75   13    326    26  2.513  G39

C/2015 ER61   30/06/2017 09:51:32    1.56   1.34  17.69  12.82   16    315    20  2.498  G39

C/2015 ER61   02/07/2017 09:52:16    1.57   1.36  17.58  12.87   16    312    19  2.494  G39

C/2015 ER61   03/07/2017 09:54:09    1.57   1.37  17.52  12.82   11    334    31  2.524  G39

C/2015 ER61   04/07/2017 09:51:58    1.58   1.38  17.47  12.86   16    328    21  2.516  G39

C/2015 ER61   05/07/2017 09:52:58    1.58   1.39  17.42  12.89   15    327    22  2.515  G39

C/2015 ER61   06/07/2017 09:52:00    1.59   1.40  17.37  12.90   15    329    22  2.517  G39

C/2015 ER61   07/07/2017 09:53:01    1.59   1.41  17.32  12.93   11    329    29  2.517  G39

C/2015 ER61   08/07/2017 09:53:19    1.60   1.42  17.27  13.09   14    287    21  2.458  G39

C/2015 ER61   09/07/2017 09:54:15    1.60   1.43  17.22  13.06   12    303    26  2.481  G39

C/2015 ER61   10/07/2017 09:51:29    1.61   1.44  17.18  13.08   10    303    30  2.481  G39

C/2015 ER61   11/07/2017 09:53:52    1.61   1.46  17.14  13.27   12    259    23  2.413  G39

C/2015 ER61   12/07/2017 09:54:08    1.61   1.47  17.10  13.23   11    274    24  2.438  G39

C/2015 ER61   13/07/2017 09:54:09    1.62   1.48  17.06  13.29   12    266    23  2.425  G39

C/2015 ER61   06/08/2017 00:09:41    1.67   1.74  16.48  14.01   11    203    18  2.308  B96

C/2015 ER61   23/09/2017 22:28:04    1.66   2.32  16.57  15.09    4    132    35  2.122  B96

C/2015 ER61   24/09/2017 22:26:12    1.66   2.34  16.57  14.80    4    174    42  2.240  B96

C/2015 ER61   15/10/2017 00:08:54    1.70   2.57  16.24  15.24   23    148     7  2.169  B96

C/2015 ER61   16/10/2017 00:30:03    1.70   2.58  16.20  15.15   16    162    10  2.210  B96

C/2015 ER61   21/10/2017 21:24:29    1.73   2.65  15.95  15.12   19    180    10  2.256  B96

C/2015 ER61   13/11/2017 22:31:00    1.93   2.92  14.30  15.31   20    229    11  2.361  B96

Af(rho) data according the CARA-approach is available via request to CARA-coordinator

http://cara.uai.it

2015 ER61 was discovered on March 15, 2015 when it was 8.44 AU from the Sun and magnitude 21.5, by Pan-STARRS 1 telescope (Haleakala) apperantly as a asteroid.  On 1 february 2016 there was an CBET 4249 issued that this asteroid has cometary features since several weeks.  By early February 2016, the object reached magnitude 20, and made a close approach to Jupiter on March 28, 2016 of 0.9245 AU. This changed its orbit, significantly decreasing its aphelion distance from 1430 AU to ~1200 AU, and as it passes through the inner Solar System its aphelion decreases to 770 AU, and by 2020 will have an aphelion of 854 AU.

The barycentric orbital period will decrease from 19000 years (epoch 1950) to 9000 years (epoch 2050).

As of January 2017, it was magnitude 13, and increasing in brightness. On April 4, 2017, it was detected outbursting to magnitude 6.5. On April 19, 2017, it will reach its closest point to Earth of ~1.2 AU. At this point, it will be about apparent magnitude 8,and, assuming a size of 20 km, have an apparent size of 19 mas. It will come to perihelion (closest approach to the Sun) on May 10, 2017. It will not be 50 AU from the Sun until 2045.

Since 10 june 2017 we could see that there was something going on because the central condensation  was more and more elongated, until on images of june 13th, we could clearly experience the existence of a fragment and reported this to MPC and CBAT.  On 18 june the MPEC 2017-M09 : COMET C/2015 ER61-B (PANSTARRS) was issued with our astrometry taken with our remote telescope, station MPC:G39

Later on june 24th the CBET was released: CBET 4409: 20170624 : COMET C/2015 ER-61 (PANSTARRS)

Snip….. COMET C/2015 ER_61 (PANSTARRS)

     This comet (cf. CBETs 4249, 4383) has evidently experienced a splitting: a companion fragment (denoted 'B') was reported by E. Bryssinck (Kruibeke, Belgium) from CCD images taken by F.-J.Hambsch (Mol, Belgium) and himself on June 13, 15, and 16 remotely with a 0.4-m f/6.8 reflector (both unfiltered and with a Bessel R filter) at the private "ROAD Observatory" located at San Pedro de Atacama, Chile; Bryssinck noticed a change over a couple of days in the shape of the nuclear condensation, followed by the appearance of a possible nuclear fragment inside the coma and tail.  On June 13.41 UT, seven exposures show a very faint fragment located 12".3 from the main nuclear condensation in p.a. 243 degrees with a diameter of 8" (magnitude R = 16.5 in an aperture of diameter 5".4).  Seven images taken on June 15.42 show the very faint fragment 13".0 from the main condensation in the same direction and with magnitude R = 16.6 in the same-sized aperture.  Nine images taken on June 16.41 show component B at size 8".8 (with R = 16.6 in a 5".4 aperture) and located 13".4 from component A in p.a. 248 deg.  Component B is difficult to see due its small distance from component A and to its location within the tail.

     G. Masi (Ceccano, Italy) and M. Schwartz (Rio Rico, AZ, USA) imaged comet C/2015 ER_61 around June 17.446 …. Snip….