[Iaude] MPEC X149: COMET P/2021 R8 (Sheppard)

mpec at marsden.cfa.harvard.edu mpec at marsden.cfa.harvard.edu
Tue Dec 7 13:47:36 EST 2021


M.P.E.C. 2021-X149                             Issued 2021 December 7, 18:43 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/2021 R8 (Sheppard)                           

     S. Sheppard and D. Tholen report the discovery by Sheppard of a comet in
290 second sidereally-tracked exposures taken on Sep. 5 UT by Mauna Kea-
UH/Tholen NEO Follow-Up (Subaru) telescope (T09), noting a condensed 1".1 coma
and a straight 15" tail at position angle 240 deg. Prediscovery images were
reported to Aug. 2021. Additional reports of cometary features are as follows:

OC   Date        Reporter           Coma    Tail    PA          Exposures

T09  2021-09-06  S. Sheppard        0".9    15"    240 
F52  2021-09-30  R. Weryk           0".6                          4x45s

Observations:
    PK21R080  C2021 08 12.48771623 31 42.077-02 23 20.48         22.73GVEX149F51
    PK21R080  C2021 08 12.50017323 31 41.907-02 23 22.12         23.50GVEX149F51
    PK21R080  C2021 08 12.51268123 31 41.715-02 23 24.48         23.29GVEX149F51
    PK21R080  C2021 08 12.52518623 31 41.561-02 23 26.22         23.43GVEX149F51
    PK21R080  C2021 08 17.50312623 30 25.315-02 38 26.59         22.67GVEX149F51
    PK21R080  C2021 08 17.51509723 30 25.041-02 38 28.74         23.07GVEX149F51
    PK21R080  C2021 08 17.52699623 30 24.746-02 38 31.75         23.67GVEX149F51
    PK21R080  C2021 08 20.56300023 29 20.656-02 49 47.43         22.76GVEX149F51
    PK21R080  C2021 09 04.34915723 21 37.796-04 02 44.85         21.61GVEX149F51
    PK21R080  C2021 09 04.36002023 21 37.363-04 02 48.69         22.01GVEX149F51
    PK21R080  C2021 09 04.37084023 21 36.935-04 02 52.40         21.61GVEX149F51
    PK21R080  C2021 09 04.38173523 21 36.482-04 02 56.70         21.45GVEX149F51
    PK21R080* C2021 09 05.54775223 20 51.795-04 09 35.37         21.69GVEX149T09
    PK21R080  C2021 09 06.48120723 20 16.132-04 14 58.12         21.86GVEX149T09
    PK21R080  C2021 09 09.53617823 18 16.655-04 32 47.32         21.30GVEX149F51
    PK21R080  C2021 09 12.30599 23 16 27.59 -04 49 04.8          21.7 GVEX149G96
    PK21R080  C2021 09 12.32056 23 16 26.98 -04 49 10.1          21.5 GVEX149G96
    PK21R080  C2021 09 30.32076823 05 58.160-06 24 13.66         22.15GVEX149F52
    PK21R080  C2021 09 30.34243023 05 57.507-06 24 19.19         21.97GVEX149F52
    PK21R080  C2021 09 30.35325523 05 57.158-06 24 22.26         22.56GVEX149F52
    PK21R080  C2021 10 04.39879023 04 18.891-06 40 25.31         22.29GVEX149F52
    PK21R080  C2021 10 06.30867123 03 40.817-06 47 03.28         21.97GVEX149F51
    PK21R080  C2021 10 06.33202423 03 40.305-06 47 07.76         21.60GVEX149F51
    PK21R080 KC2021 11 19.25845323 16 37.306-06 05 12.39         23.05GVEX149F51
    PK21R080 |C2021 12 07.08268 23 35 00.83 -04 14 41.8                VEX149H06
    PK21R080 |C2021 12 07.10895 23 35 02.61 -04 14 30.9          22.3 GVEX149H06

Observer details:
F51 Pan-STARRS 1, Haleakala.  Observers J. Bulger, K. Chambers, T. Lowe, A.
    Schultz, I. Smith.  Measurers S. Chastel, M. Huber, Y. Ramanjooloo, R.
    Wainscoat, R. Weryk.  1.8-m Ritchey-Chretien + CCD.
F52 Pan-STARRS 2, Haleakala.  Observers J. Bulger, K. Chambers, T. Dukes, T.
    Lowe, A. Schultz, I. Smith.  Measurers S. Chastel, M. Huber, Y.
    Ramanjooloo, R. Wainscoat, R. Weryk.  1.8-m Ritchey-Chretien + CCD.
G96 Mt. Lemmon Survey.  Observer H. Groeller.  Measurers B. Gray, D. Rankin,
    F. C. Shelly.  1.5-m reflector + 10K CCD.
H06 iTelescope Observatory, Mayhill.  Observer H. Sato.  0.43-m f/6.8
    astrograph + CCD + f/4.5 focal reducer.
T09 Mauna Kea-UH/Tholen NEO Follow-Up (Subaru).  Observers S. S. Sheppard, D.
    J. Tholen.  Measurer D. J. Tholen.  8.2-m f/2.2 reflector.

Orbital elements:
    P/2021 R8 (Sheppard)                                                        
Epoch 2021 Sept. 23.0 TT = JDT 2459480.5                                        
T 2021 Oct. 7.49504 TT                                  Bell                    
q   2.1310223            (2000.0)            P               Q                  
n   0.18793504     Peri.  190.78631     +0.99923974     +0.03801908             
a   3.0185442      Node   167.02548     -0.03229339     +0.93118476             
e   0.2940232      Incl.    2.20306     -0.02184209     +0.36255963             
P   5.24                                                                        
>From 26 observations 2021 Aug. 12-Dec. 7, mean residual 0".3.                   
                                                                                
    P/2021 R8 (Sheppard)                                                        
Epoch 2026 Dec. 26.0 TT = JDT 2461400.5                                         
T 2027 Jan. 5.75052 TT                                  Bell                    
q   2.1376684            (2000.0)            P               Q                  
n   0.18775205     Peri.  190.83095     +0.99925376     +0.03764559             
a   3.0205052      Node   167.00225     -0.03194001     +0.93119424             
e   0.2922812      Incl.    2.20283     -0.02172010     +0.36257426             
P   5.25                                                                        
>From 26 observations 2021 Aug. 12-Dec. 7, mean residual 0".3.                   
                                                                                
    P/2021 R8 (Sheppard)                                                        
Epoch 2022 Jan. 21.0 TT = JDT 2459600.5                                         
T 2021 Oct. 7.45058 TT                                  Bell                    
q   2.1310089            (2000.0)            P               Q                  
n   0.18805055     Peri.  190.76904     +0.99923023     +0.03826854             
a   3.0173080      Node   167.02845     -0.03252630     +0.93117842             
e   0.2937384      Incl.    2.20332     -0.02193158     +0.36254968             
P   5.24                                                                        
>From 26 observations 2021 Aug. 12-Dec. 7, mean residual 0".3.                   
                                                                                
Ephemeris:
Date    TT    R. A. (2000) Decl.     Delta      r    Elong.  Phase   m1    m2
2021 11 07    23 07 47.9 -06 53 29   1.4556  2.1399   120.8    23.4  22.6
...
2021 11 22    23 19 03.5 -05 51 02   1.6198  2.1507   108.7    25.8  22.9
...
2021 11 30    23 27 00.9 -05 03 38   1.7143  2.1581   102.7    26.5  23.0
...
2021 12 06    23 33 44.1 -04 22 32   1.7874  2.1644    98.5    26.8  23.1
2021 12 07    23 34 54.8 -04 15 16   1.7998  2.1655    97.8    26.8  23.1
2021 12 08    23 36 06.4 -04 07 52   1.8122  2.1666    97.1    26.8  23.1
...
2021 12 14    23 43 34.3 -03 21 14   1.8873  2.1737    93.0    26.9  23.3
...
2021 12 22    23 54 15.6 -02 13 38   1.9890  2.1842    87.8    26.7  23.4
...
2022 01 06    00 16 09.5 +00 06 25   2.1824  2.2065    78.4    25.9  23.6

M. P. C. Staff               (C) Copyright 2021 MPC           M.P.E.C. 2021-X149




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