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Comet 32P/COMAS SOLA - (= 1926 V1 = 1935 P1)

Photometric data obtained by use of FOCAS-II software

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

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

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

17P           19/10/2014 00:45:14  16.78  16.17  15.88  15.75  15.68  15.56   5.5  17.7  B96

17P           19/10/2014 00:45:14*  0.03   0.08   0.10   0.12   0.21   0.31     6   3.9  CMC

32P           06/04/2015 21:25:09  16.17  15.43  15.01  14.72  14.53  14.39  10.5  17.5  B96

32P           06/04/2015 21:25:09*  0.04   0.05   0.05   0.06   0.06   0.06     5   3.8  USN

32P           17/11/2023 20:08:57  15.40  14.81  14.49  14.32  14.23  14.16  27.3  17.5  B96

32P           17/11/2023 20:08:57*  0.02   0.03   0.02   0.02   0.02   0.02     2   3.5  Gai

32P           09/01/2024 18:51:04  15.82  15.18  14.88  14.70  14.57  14.46  19.9  18.0  B96

32P           09/01/2024 18:51:04*  0.00   0.01   0.01   0.00   0.01   0.01     2   4.0  Gai

32P           16/01/2024 19:35:13  15.97  15.30  15.01  14.81  14.67  14.62  12.6  17.3  B96

32P           16/01/2024 19:35:13*  0.01   0.04   0.04   0.05   0.04   0.03     2   3.4  Gai

                                                                     AFRHO         LOG

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

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

17P           19/10/2014 00:45:14    1.92   2.57  14.35  16.46    6     61    11  1.785  B96

32P           06/04/2015 21:25:09    1.62   2.50  16.97  15.61   11     90     9  1.955  B96

32P           17/11/2023 20:08:57    1.45   2.43  19.03  14.89   27    133     5  2.123  B96

32P           09/01/2024 18:51:04    1.60   2.22  17.20  15.35   20     88     4  1.943  B96

32P           16/01/2024 19:35:13    1.66   2.19  16.66  15.51   13     79     6  1.899  B96

Comet 32P on Kronk’s cometography

Discovery:

Josep Comas Solá (Fabra Observatory, Barcelona) discovered this comet on 1926 November 5.00 in Cetus. This observer was then conducting routine photographic work with a 6-inch telescope as part of his work on asteroids. Comas Solá estimated the magnitude as 12 and noted a slow northwestward movement. This comet was subsequently found on a plate by G. N. Neujmin (Simeis Observatory, Chrimea, Ukraine) on november 4.92 He estimated the magnitude on 12.0.  The comet was discovered about four weeks before periheliom and three seeks before closest approuch to Earth.  One of the earliest elliptical orbits was computed and published by Charles H. Smiley and Margaret K. Holbrook (Berkeley Astronomical Department) during early January 1927. They determined the perihelion date as 1927 March 22.20, the perihelion distance as 1.772 AU, and the orbital period as 8.49 years. Later calculations did little to improve on these numbers, although the orbital period was found to be 8.52 years.

Recovery:

The comet has been recovered at every return since its discovery. Because of the 8.5-year period the returns through 1969 always fell in the spring or autumn months which guaranteed its approaching Earth at distances of between 1.1 and 1.4 AU. This continually brought maximum magnitudes of 12 or 13. A moderately close approach to Jupiter in 1971 (0.73 AU) initially nudged the orbital period up to 8.94 years. This brought another very favorable return in 1978 (maximum magnitude of 13). The orbital period dropped back to 8.8 years for the 1987 and 1996 returns. The comet only brightened to about magnitude 14 during the latter year.

[ source: Kronk’s Cometography vol.3]