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Comet 170P/CHRISTENSEN - (=P/2005 M1)

Photometric data obtained by use of FOCAS-II software

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

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

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

170P          18/10/2014 22:25:00  17.89  17.27  17.00  16.90  16.77  16.77   3.5  17.7  B96

170P          18/10/2014 22:25:00*  0.16   0.24   0.27   0.35   0.38   0.46     5   3.5  USN

170P          10/01/2024 22:18:13  17.75  17.24  17.00  17.07                 9.2  17.8  B96

170P          10/01/2024 22:18:13*  0.06   0.07   0.07   0.18                   2   4.0  Gai

                                                                     AFRHO         LOG

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

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

170P          18/10/2014 22:25:00    1.97   2.93  14.02  17.58    4     30     8  1.470  B96

170P          10/01/2024 22:18:13    2.68   3.26  10.30  17.67    9     62     7  1.795  B96

Discovery comet P/2005 M1 (Christensen): IAUC 8547

E. J. Christensen, Lunar and Planetary Laboratory, reports his discovery of a comet on images taken with the 1.5-m f/2 reflector in the course of the Mount Lemmon Survey .  On four co-added 90-s CCD images from June 17.4 UT, Christensen noted a 5" coma and a 10" tail in p.a. 230-240 deg; images taken in improved seeing on 2005 June 18.4 showed a 15" tail in p.a. 230 deg and a compact coma of diameter approximately 7" (four co-added 60-s exposures).  Following posting on the 'NEO Confirmation Page', A. C. Gilmore found a moderately condensed, circular coma of diameter about 15" (but no tail) on four co-added 120-s CCD frames taken on June 19.7 with the 1.0-m f/7.7 reflector at Mount John University Observatory. Further observations show that it is a periodic comet with period of 8.6 years and will reach perihelion at 2.93 AU in late January 2006.  Comet P/2005 M1 found in images dating back to 1997) has been assigned the number 170P (MPC 54661). So this comet was assigned as 170P/Christensen.  (IAUC 8591)

MPEC 2005-P59 : COMET P/2005 M1 (CHRISTENSEN)