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Comet 118P/SHOEMAKER-LEVY  -  (=1991 C2 = 1995 M1)

Photometric data obtained by use of FOCAS-II software

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

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

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

118P          07/02/2023 21:10:07  15.66  14.83  14.40  14.12  13.89  13.74  23.1  17.5  B96

118P          07/02/2023 21:10:07*  0.02   0.01   0.01   0.01   0.00   0.01     2   3.5  Gai

118P          13/02/2023 21:22:30  15.89  15.07  14.59  14.26  14.03  13.86  23.1  18.2  B96

118P          13/02/2023 21:22:30*  0.02   0.00   0.00   0.00   0.01   0.02     2   3.4  Gai

118P          26/02/2023 20:59:29  16.39  15.61  15.14  14.82  14.62  14.46  21.1  18.3  B96

118P          26/02/2023 20:59:29*  0.01   0.04   0.03   0.00   0.01   0.00     2   3.4  Gai

118P          25/04/2023 20:42:31  18.08  17.34  16.89  16.63  16.43  16.30   4.9  18.1  B96

118P          25/04/2023 20:42:31*  0.11   0.03   0.07   0.05   0.08   0.02     2   3.4  Gai

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

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

118P          07/02/2023 21:10:07    0.97   1.94  28.57  14.49   23     54     2  1.731  B96

118P          13/02/2023 21:22:30    1.00   1.95  27.63  14.71   23     48     2  1.680  B96

118P          26/02/2023 20:59:29    1.10   1.99  25.17  15.36   21     33     2  1.517  B96

118P          25/04/2023 20:42:31    1.83   2.22  15.10  17.63    5     14     3  1.144  B96

Discovery:

C. S. Shoemaker, E. M. Shoemaker, and D. H. Levy (Palomar Observatory, California, USA) discovered this comet in Virgo on films exposed on 1991 February 9.46 with the 0.46-m Schmidt telescope. The comet was described as diffuse and magnitude 17. There was also a short tail extending toward the west. a revised orbit indicated a period of 6.53 years.

Recovery:

S. Nakano predicted the comet would next arrive at perihelion on 1997 January 12. The prediction enabled James V. Scotti to recover the comet on 1995 June 22.45. Scotti used the 0.9-m Spacewatch telescope at Kitt Peak. The comet was described as stellar with a magnitude of 21.9. The Scotti's position indicated the predicted perihelion date was only in error by 0.6 day.