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204P/LINEAR-NEAT (=P/2008 R5 = 2001 TU80)

Photometric data obtained by use of FOCAS-II software

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

OBJECT        DATE       TIME        +/-    +/-    +/-    +/-    +/-    +/-     N  FWHM  CAT

------------  ---------- --------  -----  -----  -----  -----  -----  -----  ----  ----  ---

204P          17/01/2016 22:05:40  17.08  16.45  16.12  15.98  15.89  15.81   9.9  18.0  B96

204P          17/01/2016 22:05:40*  0.00   0.05   0.10   0.15   0.11   0.17     3   4.0  USN

                                                                     AFRHO         LOG

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

------------  -------------------   -----  -----  -----  -----  ---  -----  ----  -----  ---

204P          17/01/2016 22:05:40    0.98   1.96  28.25  16.26   10     11     1  1.039  B96

An 18th mag object independently discovered and reported as nebulous with a 3" coma by NEAT at Palomar on Nov. 16.53 UT was identified by G. V. Williams, Minor Planet Center, with an apparently asteroidal object reported on Oct. 13.44 and 17 by LINEAR (m_2 = 19.8; discovery observations on MPS 39482) and on Oct. 19 by NEAT at Haleakala (MPS 40840), from which an apparently routine minor-planet orbit was computed (MPEC 2001-V35). Following posting on the NEO Confirmation Page, P. Kusnirak at Ondrejov found the comet to be moderately condensed with a 0'.3 coma on CCD images taken on Nov. 17.2 with a 0.65-m f/3.6 reflector. [IAUC 7753, 2001 November 17] The comet is in a short period orbit of 7.2 years, with perihelion of 1.94 AU in mid December 2001.

The comet passed within about 0.1 AU of Jupiter in 1985, prior to which it was in a more distant, less eccentric orbit.

Gareth Williams identified images of 2001 TU80 in incidental astrometry taken with the 1.8-m Spacewatch telescope on September 8.43. The comet is at perihelion in December. The indicated correction to the prediction on MPC 54171 is Delta(T) = -0.3 day.