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 comet 320P/MCNAUGHT - (= 2004 R1  = 2015 HC10)

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:

Robert McNaught discovered this comet on CCD images taken by himself with the 0.5-m Uppsala Schmidt telescope at Siding Spring on 2004 Sept. 2.4 UT, when the object was diffuse with a hint of a tail to the southeast and 18the magnitude.  McNaught found the comet again with the Siding Spring 1.0-m f/8 reflector on Sept. 4.4 and appears to be diffuse with a 10" coma and a tail 15" long in p.a. 110 deg. with 19the magnitude ( IAUC 8398 ). The period was 5.49 years

Recovery:

J. Young (Table Mountain, 0.6-m reflector + CCD) reports that images taken in poor seeing (and at low altitude) on Sept. 6.13- 6.16 UT show a coma diameter of about 5". Additional CCD images by R. H. McNaught with the Siding-Spring 1.0-m reflector on Sept. 6.5 show an ill-defined center of brightness that is elongated in the direction of tail (and of the comet's motion). [IAUC 8400, 2004 September 6]

An apparently asteroidal object found on images taken with the Cerro Tololo 4-m reflector by L. Allen and D. James (measured by F. Valdes) was posted on the Minor Planet Center's NEOCP webpage and then announced on MPEC 2015-H82 with the minor-planet designation 2015 HC10. Gareth Williams, F. Manca, and P. Sicoli then each identified it with comet P/2004 R1. The comet was missed at its 2010 return. The indicated correction to the prediction by S. Nakano on MPC 79350 is Delta(T) = +5.0 d