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 comet 309P/LINEAR ( = 2005 Q4 = 2014 Q4 )

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:

An apparently asteroidal object discovered by LINEAR on 2005 aug. 31.4, and posted on the 'NEO Confirmation Page', has been found to show a 16" tail in p.a. 255 deg on CCD images taken by J. Lacruz (Madrid, Spain, 0.30-m reflector) on Sept. 3.04-3.05 UT.  J. Young (Table Mountain, 0.6-m f/16 Cassegrain reflector) reports that his long CCD exposures taken on Sept. 4.5 show an extension 16" long between p.a. 240 deg and 270 deg and a very round, condensed coma 4" in diameter in very good seeing; his images on Sept. 5.5 show a 6" slightly elongated coma (total mag 17.5) with a 40" straight, narrow tail in p.a. 265 deg.  ( IAUC 8595 )

Recovery:

Krisztian Sarneczky recovered 2005 Q4 (P/LINEAR) with a 0.6m Schmidt at the Piszkesteto Station of Konkoly Observatory on 2014 August 23.00, with PanSTARRS images from the same night later found by Gareth Williams. The indicated correction to the prediction by Gareth Williams on MPC 75706 is Delta(T) = -0.26 day. [CBET 3937, MPEC 2014-Q39, 2014 August 24] The comet has a period of 9.4 years and reaches perihelion at 1.7 au in 2015 February.