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155P/SHOEMAKER - (1986 A1 = 2002 R2)

Photometric data obtained with FOCAS-II software

COD B96

OBS BRIXIIS Observatory

CATALOG: Gaia DR2 - BAND: G

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

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

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155P          17/03/2020 21:54:48  17.84  17.09  16.74  16.50  16.35  16.37   6.2  18.1  B96

155P          17/03/2020 21:54:48*  0.14   0.08   0.04   0.05   0.05   0.11     3   3.8  Gai

155P          21/03/2020 22:46:26  18.00  17.31  17.04  16.98  17.04          7.1  18.3  B96

155P          21/03/2020 22:46:26*  0.03   0.08   0.21   0.36   0.45            4   3.7  Gai

155P          23/03/2020 22:16:41  18.11  17.35  16.93  16.88  16.89          6.8  18.3  B96

155P          23/03/2020 22:16:41*  0.05   0.07   0.07   0.10   0.18            2   3.8  Gai

                                                                     AFRHO         LOG

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

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155P          17/03/2020 21:54:48    1.27   2.23  21.79  17.09    6     11     2  1.050  B96

155P          21/03/2020 22:46:26    1.30   2.26  21.18  17.40    7      9     1  0.957  B96

155P          23/03/2020 22:16:41    1.32   2.27  20.87  17.41    7      9     1  0.972  B96

155P on Kronk’s cometography

Caroline and Eugene Shoemaker (Palomar Observatory, California, USA) discovered this comet on a photographic plate obtained with the 0.46-m Schmidt telescope on 1986 January 10.47. They estimated the magnitude as 10 (although it was later revised to 12) and described the comet as moderately condensed, with a short tail. The comet was confirmed by B. A. Skiff (Lowell Observatory, Anderson Mesa Station, Arizona, USA) on January 12.37. He gave the magnitude as 13 and noted the short tail extended toward PA 86°. Comet was assigned as Shoemaker 1986a via IAUC 4165 issued on 1986 jan. 17 by Brian G. Marsden.  Several observers were providing magnitude estimates of 13 shortly after mid-January. Several observatories followed the comet during the next few months as it steadily faded. It was last detected with the Spacewatch telescope (Steward Observatory, Arizona, USA) on May 14.20

This comet was independently recovered on 2002 September 9.78 by T. Oribe (Saji Observatory) and on September 12.81 by A. Nakamura (Kuma Kogen Observatory, Japan). The magnitude was then given as 18.0 and 18.6, respectively. Prediscovery images were subsequently found on photographs obtained by T. Seki (Geisei, Japan) on September 4.80 and 7.81. The comet was well observed at this apparition and numerous observers indicated the brightness attained a maximum value between 13 and 14.  Comet was assigned as P/2002 R2 via IAUC 7969 issued on 2002 sept. 13 by D.W.E. Green.

Last updated: 2020-10-20