[Iaude] MPEC Q35: COMET P/2018 P4 (PANSTARRS)

mpec at mpcdb1.cfa.harvard.edu mpec at mpcdb1.cfa.harvard.edu
Sat Aug 18 16:35:16 EDT 2018


M.P.E.C. 2018-Q35                                Issued 2018 Aug. 18, 20:23 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/2018 P4 (PANSTARRS)

     On the basis of F51 images on Aug. 8, R. Weryk reported this object as a
possible comet, with a 1".2 FWHM, compared to the stellar  value of 1".0.
R. Wainscoat (568, Aug. 10) reported a FWHM of 0".95 (vs stellar 0".7) and a
broad low-surface-brightness 15" tail in P.A. ~230.  K. Sarneczky and
O. Hanyecz (K88, Aug. 18.0 UTC) repor a nearly stellar coma and a slighty-
curved ~15" tail to the SW.

Observations:
    PK18P040  C2018 07 10.56729 23 57 12.145-06 06 59.99         21.6 wUEQ035F51
    PK18P040  C2018 07 10.58904 23 57 12.310-06 06 54.52         21.5 wUEQ035F51
    PK18P040  C2018 07 10.59984 23 57 12.403-06 06 51.73         21.5 wUEQ035F51
    PK18P040* C2018 08 08.50138 23 54 34.812-04 30 01.67         20.6 wUEQ035F51
    PK18P040  C2018 08 08.51317 23 54 34.553-04 29 59.88         20.6 wUEQ035F51
    PK18P040  C2018 08 08.52499 23 54 34.305-04 29 58.12         20.6 wUEQ035F51
    PK18P040  C2018 08 08.53682 23 54 34.046-04 29 56.41         20.6 wUEQ035F51
    PK18P040 KC2018 08 10.00723423 54 03.37 -04 26 23.8          20.5 GVEQ035L01
    PK18P040 KC2018 08 10.02468823 54 02.98 -04 26 21.3          20.3 GVEQ035L01
    PK18P040 KC2018 08 10.03779223 54 02.69 -04 26 19.2          20.4 GVEQ035L01
    PK18P040 _C2018 08 10.54585623 53 51.571-04 25 05.52         20.6 GVEQ035568
    PK18P040 _C2018 08 10.54680123 53 51.543-04 25 05.38         20.4 GVEQ035568
    PK18P040 _C2018 08 10.54774623 53 51.526-04 25 05.25         20.5 GVEQ035568
    PK18P040 1C2018 08 12.63856 23 53 03.28 -04 20 13.3                VEQ035Q62
    PK18P040 1C2018 08 12.64141 23 53 03.20 -04 20 13.2                VEQ035Q62
    PK18P040 1C2018 08 12.64426 23 53 03.12 -04 20 12.9          20.3  VEQ035Q62
    PK18P040 HC2018 08 14.36006 23 52 20.30 -04 16 29.7          19.3 RoEQ035691
    PK18P040 HC2018 08 14.37492 23 52 19.96 -04 16 28.1          19.6 RoEQ035691
    PK18P040 HC2018 08 14.39043 23 52 19.43 -04 16 27.1          19.0 RoEQ035691
    PK18P040 KC2018 08 17.04078 23 51 08.11 -04 10 53.8          19.4 RoEQ035K88
    PK18P040 KC2018 08 17.04783 23 51 07.89 -04 10 52.9          19.8 RoEQ035K88
    PK18P040 KC2018 08 17.05488 23 51 07.69 -04 10 52.0          19.6 RoEQ035K88
    PK18P040 KC2018 08 17.07927 23 51 07.00 -04 10 50.1          19.9 GVEQ035104
    PK18P040 KC2018 08 17.09023 23 51 06.68 -04 10 48.8          18.8 GVEQ035104
    PK18P040  C2018 08 17.44815 23 50 56.697-04 10 03.73         20.3 wUEQ035F51
    PK18P040  C2018 08 17.45937 23 50 56.360-04 10 02.38         20.4 wUEQ035F51
    PK18P040  C2018 08 17.47055 23 50 56.040-04 10 01.08         20.2 wUEQ035F51
    PK18P040  C2018 08 17.50773 23 50 54.929-04 09 56.55         20.2 wUEQ035F51
    PK18P040 KC2018 08 17.99720 23 50 40.87 -04 08 58.8          19.4 RoEQ035K88
    PK18P040 KC2018 08 18.00567 23 50 40.62 -04 08 58.0          19.7 RoEQ035K88
    PK18P040 KC2018 08 18.01413 23 50 40.37 -04 08 56.8          19.6 RoEQ035K88
    PK18P040 KC2018 08 18.05245 23 50 39.25 -04 08 53.0          19.5 RrEQ035106
    PK18P040 KC2018 08 18.06380 23 50 38.88 -04 08 51.9          19.2 RrEQ035106
 
Observer details:
104 San Marcello Pistoiese.  Observers P. Bacci, M. Maestripieri, G. Succi.
    Measurers P. Bacci, L. Tesi, G. Fagioli.  0.6-m f/4.0 reflector + CCD.
106 Crni Vrh.  Observer B. Mikuz.  0.6-m f/3.3 Deltagraph + CCD.
568 Mauna Kea.  Observers R. J. Wainscoat, D. Woodworth.  Measurers
    M. Micheli, R. J. Wainscoat.  3.6-m Canada-France-Hawaii Telescope + CCD.
691 Steward Observatory, Kitt Peak-Spacewatch.  Observer R. A. Mastaler.
    0.9-m f/3 reflector + CCD.
F51 Pan-STARRS 1, Haleakala.  Observers J. Bulger, T. Lowe, A. Schultz,
    M. Willman.  Measurers K. Chambers, S. Chastel, L. Denneau, H. Flewelling,
    M. Huber, E. Magnier, Y. Ramanjooloo, R. Wainscoat, C. Waters, R. Weryk.
    1.8-m Ritchey-Chretien + CCD.
K88 GINOP-KHK, Piszkesteto.  Observer O. Hanyecz.  Measurer K. Sarneczky.
    1.02-m Ritchey-Chretien + CCD.
L01 Visnjan Observatory, Tican.  Observers K. Korlevic, D. Ivanic, M. Rakitic,
    L. Gelo, J. Minic, F. Hrzenjak.  Measurer E. Pettarin.  1.0-m f/2.9
    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/2018 P4 (PANSTARRS)
Epoch 2018 Nov. 18.0 TT = JDT 2458440.5
T 2018 Nov. 7.30326 TT                                  MPCW
q   3.6660684            (2000.0)            P               Q
n   0.05737517     Peri.    8.10873     +0.99841578     -0.03080367
a   6.6576365      Node   353.11020     -0.01281615     +0.69033517
e   0.4493439      Incl.   23.11087     +0.05478759     +0.72283365
P  17.18
>From 33 observations 2018 July 10-Aug. 18, mean residual 0".4.

    P/2018 P4 (PANSTARRS)
Epoch 2036 Jan. 28.0 TT = JDT 2464720.5
T 2036 Feb. 15.68250 TT                                 MPCW
q   3.6840733            (2000.0)            P               Q
n   0.05675640     Peri.    8.21144     +0.99836957     -0.03234256
a   6.7059373      Node   353.09812     -0.01164633     +0.69123252
e   0.4506251      Incl.   23.04127     +0.05587989     +0.72190828
P  17.37
>From 33 observations 2018 July 10-Aug. 18, mean residual 0".4.

    P/2018 P4 (PANSTARRS)
Epoch 2018 Mar. 23.0 TT = JDT 2458200.5
T 2018 Nov. 7.36042 TT                                  MPCW
q   3.6660281            (2000.0)            P               Q
n   0.05743101     Peri.    8.11729     +0.99841104     -0.03093676
a   6.6533200      Node   353.10906     -0.01273623     +0.69030283
e   0.4489927      Incl.   23.11366     +0.05489240     +0.72285886
P  17.16
>From 33 observations 2018 July 10-Aug. 18, mean residual 0".4.

Ephemeris:
    P/2018 P4 (PANSTARRS)
Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase   m1    m2
2018 07 19    23 57 53.7 -05 33 17   3.1311  3.7265   118.6    13.8  20.2
...
2018 08 03    23 56 10.2 -04 44 29   2.9443  3.7115   133.0    11.5  20.0
...
2018 08 11    23 53 41.4 -04 24 01   2.8602  3.7043   141.1     9.9  20.0
...
2018 08 17    23 51 09.3 -04 10 57   2.8060  3.6993   147.4     8.5  19.9
2018 08 18    23 50 40.8 -04 08 56   2.7978  3.6985   148.4     8.2  19.9
2018 08 19    23 50 11.4 -04 06 59   2.7898  3.6977   149.5     8.0  19.9
...
2018 08 25    23 46 58.6 -03 56 06   2.7470  3.6932   156.0     6.4  19.9
...
2018 09 02    23 42 03.2 -03 43 30   2.7046  3.6877   164.7     4.1  19.8
...
2018 09 17    23 31 39.2 -03 22 57   2.6741  3.6791   178.3     0.5  19.8

Gareth V. Williams           (C) Copyright 2018 MPC           M.P.E.C. 2018-Q35



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