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171P/SPAHR

Photometric data obtained by use of FOCAS-II software

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

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

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

171P          20/01/2019 20:23:50  17.66  16.87  16.51  16.41  16.48          5.4  16.8  B96

171P          20/01/2019 20:23:50*  0.22   0.16   0.15   0.17   0.25            6   3.6  CMC

171P          23/02/2019 18:29:47  18.90  18.13  17.77                        2.5  17.9  B96

171P          23/02/2019 18:29:47*  0.31   0.18   0.34                          5   3.5  CMC

171P          26/02/2019 18:48:35  19.13  18.23  17.82  17.50  17.33  17.14   3.0  17.9  B96

171P          26/02/2019 18:48:35*  0.21   0.05   0.11   0.20   0.21   0.09     2   4.2  CMC

                                                                     AFRHO         LOG

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

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

171P          20/01/2019 20:23:50    1.01   1.77  27.42  16.75    5      6     1  0.787  B96

171P          23/02/2019 18:29:47    1.32   1.81  20.81  18.13    3      3     1  0.493  B96

171P          26/02/2019 18:48:35    1.36   1.82  20.30  18.29    3      3     1  0.453  B96

Comet 171P/SPAHR - GARY W. KRONK’s Cometography

comet (1998 W1) was discovered by Timothy B Spahr of the University of Arizona on November 16.4 on CCD images taken with the Catalina Sky Survey 0.41-m f3 Schmidt. It was 16th mag and there was no visible tail, with the round coma 18" in diameter. (IAUC 7052, issued on 1998 November 17). The preliminary orbit suggested that it would reach perihelion in February and brighten another magnitude.

Comet P/Spahr was recovered as C/2005 R3 by F. Fratev and E. Mihaylova of Zvezdno Obshtestvo Obsevatory, Plana, with a 0.25-m f/4.7 reflector and by E. J. Christensen with the Catalina 0.68-m Schmidt telescope.

171P/Spahr was recovered on 20–24 October 2011 at apparent magnitude 20.6 using the 2.0-metre (79 in) Faulkes Telescope South by Ernesto Guido, Giovanni Sostero, Nick Howes and Antoni Kasprzyk.  171P/Spahr is peaked at about magnitude 18 in 2012.