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211P/HILL  - (=P/2003 F6 - P/2008 X1)

Photometric data obtained by use of FOCAS-II software

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

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

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

211P          17/01/2016 22:20:37  16.92  16.38  16.12  16.05  16.02  16.06  13.0  17.8  B96

211P          17/01/2016 22:20:37*  0.00   0.00   0.00   0.00   0.00   0.00     1   3.7  USN

211P          26/02/2023 22:45:03  18.90  18.41  18.35                        1.9  18.2  B96

211P          26/02/2023 22:45:03*  0.19   0.35   0.27                          2   3.5  Gai

                                                                     AFRHO         LOG

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

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

211P          17/01/2016 22:20:37    1.37   2.35  20.15  16.46   13     26     2  1.415  B96

211P          26/02/2023 22:45:03    1.58   2.51  17.46  18.57    2      6     3  0.750  B96

Rik Hill discovered a 17th magnitude comet on CCD images taken with the 0.68-m Catalina Schmidt telescope on December 4.34. The comet reaches perihelion at 1.6 in May 2009.  Calculations by Hirohisa Sato allow for the possibility of an elliptic orbit of period 11 years and perihelion at 2.0 AU in early June 2009. This was confirmed by subsequent orbits, which give a period of 6.7 years and perihelion 2.4 AU in 2009 May. With an improved orbit, Maik Meyer subsequently found previously unidentified images of the comet on frames taken by NEAT on 2003 March 24 and LONEOS on 2003 April 1. The comet was given the designation 2003 F6 at this return, which had perihelion on 2002 August 19.1