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 Comet  119P/PARKER-HARTLEY - (= 1989 E1 = 1995 M2)

Photometric data obtained by use of FOCAS-II software

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

COMET         UTC                    +/-    +/-    +/-    +/-    +/-    +/-     N  FWHM  CAT

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

119P          06/04/2015 20:21:14  19.18  19.13  18.70                        1.3  17.9  B96

119P          06/04/2015 20:21:14*  0.05   0.08   0.66                          3   3.4  USN

119P          07/02/2023 20:48:12  16.34  15.61  15.21  15.00  14.81  14.66  16.1  17.8  B96

119P          07/02/2023 20:48:12*  0.01   0.00   0.01   0.00   0.02   0.02     2   3.5  Gai

119P          13/02/2023 20:29:01  16.44  15.69  15.32  15.08  14.89  14.76  20.9  18.2  B96

119P          13/02/2023 20:29:01*  0.03   0.03   0.03   0.02   0.01   0.02     2   3.2  Gai

119P          26/02/2023 20:23:30  16.76  16.04  15.69  15.46  15.31  15.20  17.2  18.3  B96

119P          26/02/2023 20:23:30*  0.01   0.01   0.01   0.01   0.01   0.03     2   3.5  Gai

119P          27/03/2023 20:18:53  17.39  16.75  16.36  16.19  16.11  16.09  11.2  18.1  B96

119P          27/03/2023 20:18:53*  0.01   0.02   0.07   0.07   0.15   0.18     2   3.3  Gai

119P          25/04/2023 20:21:25  17.97  17.31  16.77                        4.5  17.7  B96

119P          25/04/2023 20:21:25*  0.10   0.08   0.04                          2   3.1  Gai

                                                                     AFRHO         LOG

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

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

119P          06/04/2015 20:21:14    3.20   3.56   8.62  19.30    1     24    18  1.375  B96

119P          07/02/2023 20:48:12    1.72   2.63  16.03  15.85   16     90     6  1.953  B96

119P          13/02/2023 20:29:01    1.78   2.65  15.50  15.98   21     87     4  1.937  B96

119P          26/02/2023 20:23:30    1.93   2.69  14.29  16.39   17     72     4  1.857  B96

119P          27/03/2023 20:18:53    2.35   2.79  11.73  17.19   11     55     5  1.740  B96

119P          25/04/2023 20:21:25    2.83   2.89   9.75  18.02    5     40     9  1.598  B96

119P on Kronk’s cometography

Discovery

Quentin A. Parker and Malcolm Hartley (Siding Spring Observatory, Australia) discovered images of this comet on a plate taken by Parker on 1989 March 2.54 with the 1.2-m U.K. Schmidt Telescope. The comet appeared as a condensed object of magnitude 16.5 and it exhibited a tail extending six arc minutes toward PA 295 degrees.

     Shortly after the comet's announcement, R. H. McNaught (Siding Spring) found a weak, diffuse trail on a plate exposed by Parker on February 11.63, and a short time after that, McNaught proved that the February and March objects were the same comet.

     It was quickly realized that this comet had passed perihelion nearly two years prior to its discovery and astronomers began looking for other images of the comet. On March 7 it was announced that S. Nakano had identified minor planet 1986 TF with the comet. A. Mrkos (Klet) and P. Jensen (Brorfelde) had both reported this as a minor planet and an orbit had been determined which indicated it was a Hilda-class minor planet. The new observations allowed a very precise determination of the orbit just 5 days after its initial discovery. Jensen reexamined his images of 1986 TF and found they were slightly diffuse when compared to other minor planets on the same plate. (Source: Kronk’s Cometography). the orbital period was was calculated as 8.33 years

Recovery: ( IAUC 6180)

Scotti  reports his recovery of comet P/1989 E1 = 1986 TF (= 1989 XXXVI = 1989i)on 1995 june 23.4 UT with the 0.9-m Spacewatch telescope at Kitt Peak., the second-night images being obtained by R. Jedicke. There was a 7" coma (m1 = 19.2) with a tail extending 0'.88 in p.a. 247 deg on June 23 and 0'.76 in p.a. 248 deg on June 25.  The indicated correction to the prediction by Nakano on MPC 22031 is Delta T = +0.7 day.