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Comet C/2009 T1 (McNAUGHT)

IAUC 9080: COMET C/2009 T1 (MCNAUGHT)

Discovery:

Rob McNaught discovered an 18th magnitude comet on CCD-images taken during the Siding Spring Survey with the 0.5-m Uppsala Schmidt on 2009 October 9.75. The comet was at perihelion at 6.2 AU in October 2009.

The MPEC 2009-Y10 mention : The "original" and "future" barycentric values of 1/a are +0.000878 and +0.000942 (+/- 0.000038) AU^-1, respectively.  This suggest (moderate "original" value) that this is not the first apparition and  that this comet may have made a previous visit to the inner solar system

Photometry according FOCAS-II

COD D96

OBS BRIXIIS Observatory

CATALOG: Gaia DR2 - BAND: G

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

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

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

C/2009 T1     12/10/2009 17:49:20  18.07  17.63  17.29  16.90  16.39  16.11   5.6  17.7  D96

C/2009 T1     12/10/2009 17:49:20*  0.02   0.03   0.18   0.28   0.23   0.22     2   5.0  Gai