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Comet 151P/HELIN - ( =1987 Q3 = 2001 M1)

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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                                                                     AFRHO         LOG

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

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Discovery:

During September 1987, E. F. Helin discovered this comet on plates exposed on 1987 August 24.43 and August 26.42 in the course of the Second Palomar Observatory Sky Survey (Palomar Observatory, California, USA). The plates were originally exposed by J. Mueller using the 48-inch Oschin Schmidt Telescope. Helin described the comet as magnitude 16.5 and condensed, with a faint diffuseness toward PA 235°. A. Maury (Palomar Observatory) subsequently reported that faint images were found on exposures by Mueller and J. Phinney on September 17 and 18.

Recovery:

The comet was recovered by M. Busch, A. Seib, F. Hormuth, R. Stoss, A. Gnadig, and A. Doppler on 2001 June 20.14, while using the Estaci—n de Observaci—n de Calar Alto (EOCA) 1.52-m reflector (Calar Alto, Almería, Spain). The magnitude was estimated as 20. The prediction by B. G. Marsden was only 1.0 day late, so that the actual perihelion date was 2001 September 23.72. The comet was last detected on 2001 December 17.17, when it was detected by the Lowell Observatory Near-Earth Object Search program.