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Comet 30P/REINMUTH - (=P/1928 D1 )

Photometric data obtained by use of FOCAS-II software

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

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

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

30P           05/10/2016 00:25:54  18.59  18.26  18.23                        3.6  18.2  B96

30P           05/10/2016 00:25:54*  0.15   0.36   0.47                          4   3.5  USN

30P           21/01/2017 19:18:00  18.16  17.62  17.45  17.54                 3.5  17.5  B96

30P           21/01/2017 19:18:00*  0.20   0.27   0.13   0.25                   4   3.8  CMC

30P           05/10/2016 23:28:28  18.71  18.46  18.29                        1.2  17.6  B96

30P           05/10/2016 23:28:28*  0.18   0.41   0.52                          4   3.7  CMC

30P           28/11/2016 20:04:13  17.61  17.04  16.66  16.47  16.27  16.08   3.6  17.4  B96

30P           28/11/2016 20:04:13*  0.15   0.14   0.19   0.16   0.23   0.14     4   3.7  USN

30P           29/11/2016 20:09:59  17.61  17.02  16.92  16.84                 4.3  17.3  B96

30P           29/11/2016 20:09:59*  0.13   0.16   0.32   0.24                   4   3.8  USN

30P           03/12/2016 20:43:28  17.98  17.18  16.84  16.40  16.26  16.16   3.0  17.2  B96

30P           03/12/2016 20:43:28*  0.20   0.35   0.38   0.37   0.44   0.40     3   3.7  USN

30P           04/12/2016 20:47:37  17.60  17.13  17.08  16.85                 6.6  17.2  B96

30P           04/12/2016 20:47:37*  0.07   0.22   0.36   0.37                   3   3.7  USN

30P           05/01/2017 20:20:03  17.76  17.25  17.35                        4.7  16.8  B96

30P           05/01/2017 20:20:03*  0.19   0.06   0.06                          6   3.6  USN

30P           26/01/2017 19:23:24  17.59  16.52                               2.3  17.0  B96

30P           26/01/2017 19:23:24*  0.21   0.16                                 4   3.7  USN

30P           13/02/2017 19:44:33  17.95  17.32  17.22  17.09  17.11  16.88   3.1  17.0  B96

30P           13/02/2017 19:44:33*  0.41   0.41   0.49   0.60   0.53   0.38     4   3.5  CMC

226P          16/01/2024 18:52:24  16.33  15.67  15.51  15.41  15.48          5.2  16.7  B96

226P          16/01/2024 18:52:24*  0.03   0.09   0.04   0.09   0.19            3   3.3  Gai

                                                                     AFRHO         LOG

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

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

30P           05/10/2016 00:25:54    2.22   3.12  12.43  18.49    4     18     5  1.266  B96

30P           05/10/2016 23:28:28    2.21   3.11  12.49  18.63    1     16    13  1.205  B96

30P           28/11/2016 20:04:13    1.99   2.84  13.83  17.34    4     36    10  1.552  B96

30P           29/11/2016 20:09:59    2.00   2.83  13.81  17.36    4     35     8  1.543  B96

30P           03/12/2016 20:43:28    2.01   2.81  13.70  17.62    3     28     9  1.441  B96

30P           04/12/2016 20:47:37    2.02   2.81  13.67  17.41    7     33     5  1.524  B96

30P           05/01/2017 20:20:03    2.23   2.64  12.37  17.61    5     30     6  1.478  B96

30P           21/01/2017 19:18:00    2.36   2.56  11.68  18.00    4     22     6  1.344  B96

30P           13/02/2017 19:44:33    2.55   2.45  10.83  17.80    3     28     9  1.450  B96

226P          16/01/2024 18:52:24    1.68   1.78  16.38  15.94    5     37     7  1.564  B96

Comet 30P on Kronk’s cometography

Discovery:

 During the course of a regular photographic asteroid survey, Karl Reinmuth (Königstuhl Observatory, Heidelberg, Germany) discovered this 12th-magnitude comet on a photograph exposed on 1928 February 22.96. The comet was located in the constellation Cancer. A short time later, Reinmuth found a prediscovery photograph exposed on January 29.11.

Apparition of 1928 (discovery): The comet's brightest apparition was that of 1928. At the time of discovery and for a few days thereafter, astronomers reported the magnitude as about 12 or 12.5. The return of 1935 was not as favorable and the comet only reached magnitude 15. A close approach to Jupiter in 1937 caused the perihelion distance to increase from 1.9 to 2.0 AU and the orbital period to increase from 7.23 to 7.69 years. The comet did not experience a return as favorable as that of 1928 through the 1980 apparition and did not become brighter than magnitude 17.

Apparition of 1942 (missed): During 1941, Michael G. Sumner began his attempt at predicting this comet's return by using the orbit predicted by J. T. Foxell and A. E. Levin for the 1935 apparition. He then applied perturbations by Jupiter and Saturn for the period of 1935 to 1942, with special care being taken around the time of the comet's close approach to Jupiter during June of 1937. Sumner predicted the comet would next arrive at perihelion on 1942 December 5.36. He noted the comet would "be most favourably placed for observation in the early months of 1943." As later calculations would reveal, the predicted perihelion date was two weeks late, because the orbit of Foxell and Levin had an orbital period nearly a month longer than the actual orbit. No observations were made.