[Iaude] MPEC B46: COMET P/2019 A6 (Lemmon-PANSTARRS)

mpec at mpcdb1.cfa.harvard.edu mpec at mpcdb1.cfa.harvard.edu
Thu Jan 17 14:07:18 EST 2019


M.P.E.C. 2019-B46                                Issued 2019 Jan. 17, 18:49 UT
 
     The Minor Planet Electronic Circulars contain information on unusual
         minor planets and routine data on comets.  They are published
    on behalf of Division F of the International Astronomical Union by the
          Minor Planet Center, Smithsonian Astrophysical Observatory,
                          Cambridge, MA 02138, U.S.A.

             Prepared using the Tamkin Foundation Computer Network

                              MPC at CFA.HARVARD.EDU
            URL https://www.minorplanetcenter.net/    ISSN 1523-6714


                      COMET P/2019 A6 (Lemmon-PANSTARRS)

     Initially report by Pan-STARRS as an asteroid, the object was suspected of
being a comet upon closer examination of the Jan. 7 images.  R. Wainscoat and
R. Weryk (568, Jan. 8) confirmed the cometary nature, noting a 1".0 FWHM
(perpendicular to the motion, compared to 0".8 for nearby stars) and a very
low surface brightness tail extending at least 20" towards P.A. 320.
A. R. Gibbs (I52, Jan. 9) reported a 5" tail in P.A. 315 in sixteeen co-added
30s exposures.  R. S. McMillan (291, Jan. 17) described a 3" tail towards the
north.  The undersigned then noted that the object had been reported as a
NEA candidate by G96 on Dec. 19, but it did not have a digest2 score high to
post to the NEOCP and there was no mention of any cometary appearance.
 
Observations:
    PK19A060  C2018 12 14.43864 09 17 54.34 -02 09 12.9          20.4 GVEB046G96
    PK19A060  C2018 12 14.44460 09 17 54.25 -02 09 21.0                VEB046G96
    PK19A060  C2018 12 14.51767 09 17 52.72 -02 10 55.3          20.6 GVEB046G96
    PK19A060  C2018 12 14.51877 09 17 52.72 -02 10 56.7          20.5 GVEB046G96
    PK19A060  C2018 12 14.51987 09 17 52.68 -02 10 58.0          20.4 GVEB046G96
    PK19A060  C2018 12 14.52097 09 17 52.67 -02 10 59.6          20.5 GVEB046G96
    PK19A060  C2018 12 16.53584309 17 11.140-02 54 09.35         20.4 GVEB046F51
    PK19A060  C2018 12 16.54823009 17 10.812-02 54 25.01         20.2 GVEB046F51
    PK19A060  C2018 12 16.56060809 17 10.516-02 54 40.89         20.7 GVEB046F51
    PK19A060  C2018 12 19.36815 09 15 58.65 -03 53 57.7          20.5 GVEB046G96
    PK19A060  C2018 12 19.37335 09 15 58.46 -03 54 04.1          20.5 GVEB046G96
    PK19A060  C2018 12 19.37854 09 15 58.32 -03 54 10.9          20.2 GVEB046G96
    PK19A060  C2018 12 19.38376 09 15 58.18 -03 54 16.6          20.9 GVEB046G96
    PK19A060* C2019 01 07.51449 09 01 17.928-09 54 29.24         20.7 wUEB046F51
    PK19A060  C2019 01 07.52615 09 01 17.191-09 54 40.47         20.6 wUEB046F51
    PK19A060  C2019 01 07.53780 09 01 16.451-09 54 51.73         20.6 wUEB046F51
    PK19A060  C2019 01 07.54948 09 01 15.711-09 55 02.98         20.6 wUEB046F51
    PK19A060  C2019 01 08.37715 09 00 24.62 -10 08 17.6          20.4 GVEB046I52
    PK19A060  C2019 01 08.37881 09 00 24.52 -10 08 19.5          20.2 GVEB046I52
    PK19A060  C2019 01 08.38332 09 00 24.23 -10 08 23.5          20.4 GVEB046I52
    PK19A060  C2019 01 08.38782 09 00 23.93 -10 08 27.6          20.2 GVEB046I52
    PK19A060 1C2019 01 08.64261 09 00 08.12 -10 12 23.1                VEB046Q62
    PK19A060 1C2019 01 08.64574 09 00 07.90 -10 12 25.9                VEB046Q62
    PK19A060 ^C2019 01 08.64664609 00 07.500-10 12 31.90         20.52GVEB046568
    PK19A060 ^C2019 01 08.64782609 00 07.422-10 12 33.04         20.47GVEB046568
    PK19A060 1C2019 01 08.64887 09 00 07.69 -10 12 29.3          19.5 GVEB046Q62
    PK19A060 ^C2019 01 08.64900809 00 07.345-10 12 34.17         20.46GVEB046568
    PK19A060  C2019 01 09.37932 08 59 21.65 -10 23 58.7          19.9 GVEB046I52
    PK19A060  C2019 01 09.38098 08 59 21.44 -10 24 01.2          20.8 GVEB046I52
    PK19A060  C2019 01 09.38464 08 59 21.25 -10 24 04.9          20.7 GVEB046I52
    PK19A060  C2019 01 09.38829 08 59 20.99 -10 24 07.9          20.1 GVEB046I52
    PK19A060  C2019 01 11.37463 08 57 12.76 -10 54 10.3          20.0 RoEB046691
    PK19A060  C2019 01 11.38123 08 57 12.28 -10 54 15.9          20.4 RoEB046691
    PK19A060  C2019 01 11.38563 08 57 12.03 -10 54 20.5          20.1 RoEB046691
    PK19A060  C2019 01 12.47660 08 55 59.75 -11 10 11.1          21.3 GVEB046I52
    PK19A060  C2019 01 12.47957 08 55 59.46 -11 10 14.3          20.3 GVEB046I52
    PK19A060  C2019 01 12.48384 08 55 59.12 -11 10 18.9          20.7 GVEB046I52
    PK19A060  C2019 01 12.48681 08 55 58.98 -11 10 21.0          20.4 GVEB046I52
    PK19A060 KC2019 01 15.05872308 53 04.97 -11 45 58.9          20.5 GVEB046L01
    PK19A060 KC2019 01 15.06222808 53 04.73 -11 46 02.0          20.4 GVEB046L01
    PK19A060 pC2019 01 15.06573508 53 04.43 -11 46 03.4          20.3 GVEB046L01
    PK19A060 9C2019 01 15.13616 08 52 59.70 -11 46 59.7          20.5 GVEB046G40
    PK19A060 9C2019 01 15.15150 08 52 58.57 -11 47 11.4          20.7 GVEB046G40
    PK19A060 KC2019 01 15.98729 08 52 01.11 -11 58 12.4          20.3 RqEB046L27
    PK19A060 KC2019 01 16.01858 08 51 58.90 -11 58 36.2          20.5 RqEB046L27
    PK19A060 KC2019 01 16.04987 08 51 56.63 -11 59 00.5          20.4 RqEB046L27
    PK19A060 KC2019 01 17.31778 08 50 28.37 -12 15 06.8          20.2 RoEB046291
    PK19A060 KC2019 01 17.32284 08 50 28.00 -12 15 10.2                oEB046291
    PK19A060 KC2019 01 17.32601 08 50 27.79 -12 15 12.7                oEB046291
 
Observer details:
291 LPL/Spacewatch II.  Observer R. S. McMillan.  1.8-m f/2.7 reflector + CCD.
568 Mauna Kea.  Observers R. Wainscoat, D. Woodworth, A. Petric.  Measurers
    R. Weryk, R. Wainscoat.  3.6-m Canada-France-Hawaii Telescope + CCD.
691 Steward Observatory, Kitt Peak-Spacewatch.  Observer M. J. Brucker.
    0.9-m f/3 reflector + CCD.
F51 Pan-STARRS 1, Haleakala.  Observers J. Bulger, K. Chambers, T. Lowe,
    E. Magnier, A. Schultz, M. Willman.  Measurers S. Chastel, M. Huber,
    Y. Ramanjooloo, R. Wainscoat, R. Weryk, K. Chambers, L. Denneau,
    J. Fairlamb, H. Flewelling, C.-C. Lin, E. Magnier.  1.8-m
    Ritchey-Chretien + CCD.
G40 Slooh.com Canary Islands Observatory.  Observer B. Lutkenhoner.  0.5-m
    f/6.8 Corrected Dall-Kirkham + CCD.
G96 Mt. Lemmon Survey.  Observers A. R. Gibbs, R. A. Kowalski.  Measurers
    B. M. Africano, E. J. Christensen, G. A. Farneth, D. C. Fuls, A. R. Gibbs,
    A. D. Grauer, H. Groeller, R. A. Kowalski, S. M. Larson, G. J. Leonard,
    R. L. Seaman, F. C. Shelly.  1.5-m reflector + 10K CCD.
I52 Steward Observatory, Mt. Lemmon Station.  Observers A. R. Gibbs,
    B. M. Africano.  Measurers B. M. Africano, E. J. Christensen,
    G. A. Farneth, D. C. Fuls, A. R. Gibbs, A. D. Grauer, H. Groeller,
    R. A. Kowalski, S. M. Larson, G. J. Leonard, R. L. Seaman, F. C. Shelly.
    1.0-m reflector + CCD.
L01 Visnjan Observatory, Tican.  Observers K. Korlevic, F. Valentine.
    Measurer K. Korlevic.  1.0-m f/2.9 reflector + CCD.
L27 29PREMOTE Observatory, Dauban.  Observer J.-F. Soulier.  0.20-m f/4
    Newtonian reflector + CCD.
Q62 iTelescope Observatory, Siding Spring.  Observer H. Sato.  0.51-m f/6.8
    astrograph + CCD + f/4.5 focal reducer.
 
Orbital elements:
    P/2019 A6 (Lemmon-PANSTARRS)
Epoch 2018 Aug. 30.0 TT = JDT 2458360.5
T 2018 Aug. 29.32543 TT                                 MPCW
q   1.9381028            (2000.0)            P               Q
n   0.07911295     Peri.  156.30017     +0.16770066     -0.82537706
a   5.3740827      Node   280.26486     +0.79403836     +0.43718699
e   0.6393612      Incl.   33.22096     +0.58427697     -0.35723975
P  12.46
>From 49 observations 2018 Dec. 14-2019 Jan. 17, mean residual 0".4.

    P/2019 A6 (Lemmon-PANSTARRS)
Epoch 2031 Jan. 14.0 TT = JDT 2462880.5
T 2031 Jan. 29.30322 TT                                 MPCW
q   1.9347110            (2000.0)            P               Q
n   0.07926140     Peri.  156.20391     +0.17145595     -0.82413751
a   5.3673701      Node   280.11622     +0.79280172     +0.44070027
e   0.6395421      Incl.   33.25319     +0.58486605     -0.35578172
P  12.43
>From 49 observations 2018 Dec. 14-2019 Jan. 17, mean residual 0".4.

    P/2019 A6 (Lemmon-PANSTARRS)
Epoch 2019 Apr. 27.0 TT = JDT 2458600.5
T 2018 Aug. 29.29375 TT                                 MPCW
q   1.9379921            (2000.0)            P               Q
n   0.07916351     Peri.  156.28617     +0.16787203     -0.82533130
a   5.3717942      Node   280.26637     +0.79393156     +0.43737019
e   0.6392282      Incl.   33.22230     +0.58437288     -0.35712122
P  12.45
>From 49 observations 2018 Dec. 14-2019 Jan. 17, mean residual 0".4.

Ephemeris:
    P/2019 A6 (Lemmon-PANSTARRS)
Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase   m1    m2
2018 12 18    09 16 35.6 -03 25 09   1.5396  2.2152   121.2    22.3  20.4
...
2019 01 02    09 06 34.9 -08 20 27   1.4920  2.2859   133.8    18.1  20.5
...
2019 01 10    08 58 42.0 -10 33 28   1.4861  2.3257   139.8    15.8  20.5
...
2019 01 16    08 52 00.2 -11 58 17   1.4919  2.3564   143.5    14.4  20.6
2019 01 17    08 50 50.6 -12 11 03   1.4937  2.3616   144.0    14.2  20.6
2019 01 18    08 49 40.5 -12 23 25   1.4958  2.3668   144.5    14.0  20.6
...
2019 01 24    08 42 33.1 -13 29 02   1.5136  2.3984   146.8    13.0  20.7
...
2019 02 01    08 33 08.1 -14 33 16   1.5515  2.4414   147.6    12.5  20.8
...
2019 02 16    08 17 53.2 -15 27 20   1.6653  2.5246   142.9    13.6  21.1

Gareth V. Williams           (C) Copyright 2019 MPC           M.P.E.C. 2019-B46



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