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Comet 116P/WILD

Photometric data obtained by use of FOCAS-II software

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

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

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

116P          31/12/2014 21:53:39  18.09  17.84  17.75  17.63                 3.6  17.4  B96

116P          31/12/2014 21:53:39*  0.46   0.52   0.42   0.50                  10   3.9  USN

116P          11/02/2022 23:04:02  14.75  14.13  13.87  13.69  13.58  13.51  17.4  16.9  B96

116P          11/02/2022 23:04:02*  0.00   0.04   0.03   0.00   0.01   0.01     2   4.0  Gai

116P          04/03/2022 23:04:59  14.88  14.14  13.82  13.62  13.47  13.36  25.6  18.2  B96

116P          04/03/2022 23:04:59*  0.01   0.01   0.03   0.02   0.02   0.02     2   3.8  Gai

116P          05/03/2022 22:42:38  14.89  14.17  13.83  13.61  13.46  13.36  26.9  17.8  B96

116P          05/03/2022 22:42:38*  0.01   0.00   0.00   0.01   0.00   0.00     2   3.6  Gai

116P          08/03/2022 22:54:27  14.94  14.17  13.85  13.64  13.49  13.37  22.9  18.1  B96

116P          08/03/2022 22:54:27*  0.02   0.02   0.03   0.02   0.02   0.02     2   3.7  Gai

116P          09/03/2022 23:10:45  14.93  14.20  13.85  13.63  13.46  13.33  15.8  17.9  B96

116P          09/03/2022 23:10:45*  0.02   0.04   0.04   0.04   0.02   0.03     2   3.6  Gai

116P          10/03/2022 21:10:13  14.96  14.20  13.84  13.62  13.46  13.35  22.9  17.6  B96

116P          10/03/2022 21:10:13*  0.03   0.00   0.01   0.01   0.01   0.00     2   3.8  Gai

116P          23/03/2022 21:59:08  15.10  14.41  14.06  13.80  13.64  13.50  25.3  17.5  B96

116P          23/03/2022 21:59:08*  0.00   0.00   0.00   0.00   0.00   0.00     1   3.9  Gai

116P          27/03/2022 22:23:49  15.20  14.48  14.13  13.89  13.71  13.60  22.4  18.2  B96

116P          27/03/2022 22:23:49*  0.01   0.02   0.00   0.00   0.00   0.00     2   3.5  Gai

116P          20/04/2022 20:05:18  15.40  14.74  14.41  14.17  14.00  13.86  21.9  17.5  B96

116P          20/04/2022 20:05:18*  0.01   0.00   0.02   0.02   0.02   0.02     2   3.5  Gai

116P          27/04/2022 20:44:55  15.47  14.79  14.48  14.24  14.08  13.96  25.3  17.8  B96

116P          27/04/2022 20:44:55*  0.01   0.03   0.04   0.01   0.02   0.01     2   3.0  Gai

116P          01/06/2022 21:40:15  15.54  14.88  14.51  14.28  14.12  14.01  16.1  17.1  B96

116P          01/06/2022 21:40:15*  0.03   0.07   0.06   0.04   0.04   0.05     4   3.6  Gai

COMET         UTC                   DELTA    R    APER    Mag   AfRho   +/-   Log   Obs

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

116P          31/12/2014 21:53:39    2.24   3.21  12.33  18.02    4     31     9  1.489  B96

116P          11/02/2022 23:04:02    1.46   2.44  18.92  14.24   17    245    14  2.390  B96

116P          04/03/2022 23:04:59    1.45   2.38  19.03  14.26   26    226     9  2.355  B96

116P          05/03/2022 22:42:38    1.45   2.38  19.00  14.28   27    224     8  2.350  B96

116P          08/03/2022 22:54:27    1.46   2.37  18.89  14.31   23    218    10  2.339  B96

116P          09/03/2022 23:10:45    1.46   2.37  18.85  14.31   16    218    14  2.339  B96

116P          10/03/2022 21:10:13    1.47   2.37  18.81  14.32   23    217     9  2.336  B96

116P          23/03/2022 21:59:08    1.53   2.34  18.04  14.54   25    188     7  2.274  B96

116P          27/03/2022 22:23:49    1.55   2.33  17.74  14.64   22    176     8  2.245  B96

116P          20/04/2022 20:05:18    1.74   2.28  15.82  14.98   22    155     7  2.191  B96

116P          27/04/2022 20:44:55    1.81   2.27  15.26  15.07   25    151     6  2.180  B96

116P          01/06/2022 21:40:15    2.15   2.22  12.84  15.29   16    168    10  2.225  B96

Discovery: [ IAUC 4956 ]

Paul Wild (Astronomical Institute, Berne University, Switzerland) on 1990 January 21.98 at a position of RA=9h 34m 31.69s, DEC=+20° 39' 39.5" (1950.0). He described the comet as strongly condensed, with a total magnitude of 13.5-14.0. There was a fan-shaped tail extending about one arc minute toward the northwest.  Prediscovery images were found by M. Ishikawa (Jorii Saitama, Japan) and T Niijama (Ojinma, Guja, Japan) on photographs obtained on jan. 21. Ishikawa gave positions for january 21.58 and january 21.66 estimating magnitude as 13.0. Photographs were obtained by use of a 16.0-cm hyperboloid astro-camera.

A later revised orbit by Wild indicated the comet passed close to Jupiter during 1987 July. The result was the semimajor axis changing from 4.6 to 3.4 and the eccentricity changing from 0.17 to 0.41

Recovery:

The comet's second appearance began on 1994 November 9.4, when it was recovered by J. V. Scotti (Lunar and Planetary Laboratory, Arizona, USA). The comet's image was then indistinguishable from that of a star and Scotti estimated the magnitude as 20.4-20.7. The position indicated the predicted orbit needed a correction of -0.3 day. The comet steadily brightened as it approached its 1996 August 31 perihelion date. By the beginning of 1996 it was already brighter than magnitude 13. By summer it had reached a maximum brightness of 12, and then began a slow fading thereafter. The comet reached a minimum solar elongation of only 40' on October 30.

[Source & credits: Cometography Gary W. KRONK]