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Comet 152P/HELIN-LAWRENCE

Photometric data obtained by use of FOCAS-II software

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

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

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152P          16/04/2021 23:10:39  17.23  16.99  16.89  16.88                 5.9  17.2  B96

152P          16/04/2021 23:10:39*  0.18   0.24   0.24   0.48                   3   3.9  Gai

                                                                     AFRHO         LOG

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

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152P          16/04/2021 23:10:39    2.43   3.41  11.36  17.17    6     89    15  1.949  B96

Discovery:

E. Helin and K. Lawrence (Palomar Observatory, California, USA) discovered the diffuse trails of this comet on photographic film exposed by Helin, Lawrence, and M. Nassar with the 46-cm Schmidt telescope on 1993 May 17.44 and May 19.35. The total magnitude was given as 16.5 on the first date, and the comet was described as diffuse with a central condensation. Helin, Lawrence, and Nassar found prediscovery images on film exposed with the 46-cm Schmidt on April 21.49 and April 22.49. The magnitude was then estimated as 17.0.

Recovery:

The comet was recovered on 2001 December 24.86 by T. Oribe (Saji Observatory) using the 1.0-m reflector. The magnitude was given as 19.5 and the position was within 2 arc seconds of the prediction published by Marsden. Oribe added that the coma was 0.15 arc minute across, while the tail extended 8 arc seconds toward PA 295°. An independent recovery was also made by K. Sarneczky and Z. Heiner (Piszkesteto) on 2002 January 11.19 using the 0.6-m Schmidt. The magnitude was given as 20, while the comet was described as diffuse, with a coma 8 arc seconds across, and a faint, narrow tail extending 13 arc seconds toward PA 283°. These positions also confirmed that the single-night observation made by C. W. Hergenrother and D. Means (Kitt Peak, Arizona, USA) on 2001 January 23 with the 2.3-m reflector was this comet. The comet was then described as stellar, with a magnitude of 21.5.

Kronk’s cometography - comet 152/HELIN-LAWRENCE