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  • MPEC 2021-R257 : COMET P/2021 R5 (Rankin)

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    M.P.E.C. 2021-R257                           Issued 2021 September 11, 22:57 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@CFA.HARVARD.EDU
                URL https://www.minorplanetcenter.net/    ISSN 1523-6714
    
                            COMET P/2021 R5 (Rankin)                         
    
         D. Rankin reports the discovery of a comet in survey images taken on
    Sep. 9 UT by Mt. Lemmon Survey (G96), noting a condensed 8" coma. Prediscovery
    positions were reported back to June 2021. Additional reports of cometary 
    features are as follows:
    
    OC   Date        Reporter           Coma    Tail    PA          Exposures
    
    F52  2021-09-05  R. Weryk           0".7                          4x45s
    246  2021-09-09  M. Tichy           5"
    P87  2021-09-09  K. Yoshimoto      14"                           19x60s
    H06  2021-09-09  H. Sato           12"      15"    150-200       12x60s
    246  2021-09-09  M. Tichy           5"
    G40  2021-09-10  N. Paul            8".4                         34x50s
    
    Observations:
        PK21R050  C2021 06 22.59006500 19 15.676+08 37 07.42         21.80GVER257F51
        PK21R050  C2021 06 22.59393300 19 15.821+08 37 08.60         21.40GVER257F51
        PK21R050  C2021 06 22.59783300 19 16.009+08 37 10.20         21.05GVER257F51
        PK21R050  C2021 08 11.48998700 40 05.301+11 15 39.88         20.21GVER257F51
        PK21R050  C2021 08 11.50106300 40 05.307+11 15 40.18         20.17GVER257F51
        PK21R050  C2021 08 11.51223700 40 05.316+11 15 40.48         20.04GVER257F51
        PK21R050  C2021 09 01.39894800 37 05.837+10 55 39.86         19.96GVER257F52
        PK21R050  C2021 09 05.38709 00 35 44.850+10 45 04.02         19.9 wUER257F52
        PK21R050  C2021 09 05.39799 00 35 44.601+10 45 02.06         20.0 wUER257F52
        PK21R050  C2021 09 05.40892 00 35 44.344+10 45 00.28         20.1 wUER257F52
        PK21R050  C2021 09 05.41989 00 35 44.090+10 44 58.29         20.1 wUER257F52
        PK21R050  C2021 09 06.36104 00 35 22.90 +10 42 07.5          20.1 GVER257703
        PK21R050  C2021 09 06.36627 00 35 22.77 +10 42 07.3          20.3 GVER257703
        PK21R050  C2021 09 06.37150 00 35 22.62 +10 42 06.2          19.6 GVER257703
        PK21R050  C2021 09 07.46559100 34 57.32 +10 38 41.4          19.39oVER257T08
        PK21R050  C2021 09 07.46836400 34 57.28 +10 38 42.0          19.59oVER257T08
        PK21R050  C2021 09 07.47113100 34 57.23 +10 38 41.7          19.44oVER257T08
        PK21R050  C2021 09 07.47619400 34 57.07 +10 38 38.5          19.49oVER257T08
        PK21R050* C2021 09 09.28644000 34 13.28 +10 32 39.6          19.34GVER257G96
        PK21R050  C2021 09 09.29208200 34 13.13 +10 32 38.3          19.26GVER257G96
        PK21R050  C2021 09 09.29865300 34 12.96 +10 32 36.9          19.35GVER257G96
        PK21R050  C2021 09 09.30527600 34 12.78 +10 32 35.6          19.26GVER257G96
        PK21R050  C2021 09 09.38955600 34 10.57 +10 32 18.1          19.45GVER257G96
        PK21R050  C2021 09 09.39600300 34 10.39 +10 32 16.9          19.43GVER257G96
        PK21R050  C2021 09 09.40265800 34 10.24 +10 32 15.5          19.37GVER257G96
        PK21R050 |C2021 09 09.42866 00 34 09.53 +10 32 10.0                VER257H06
        PK21R050 |C2021 09 09.43373 00 34 09.37 +10 32 08.9          18.8 GVER257H06
        PK21R050 KC2021 09 09.67330 00 34 03.50 +10 31 18.8                VER257P87
        PK21R050 KC2021 09 09.68100 00 34 03.24 +10 31 18.1          19.3 RVER257P87
        PK21R050 KC2021 09 09.89034 00 33 58.10 +10 30 33.0          19.3 GXER257G02
        PK21R050 1C2021 09 09.90359900 33 57.81 +10 30 30.0          19   GVER257246
        PK21R050 KC2021 09 09.90362 00 33 57.76 +10 30 29.7          19.2 GXER257G02
        PK21R050 1C2021 09 09.90394100 33 57.78 +10 30 29.8                VER257246
        PK21R050 1C2021 09 09.90648300 33 57.69 +10 30 29.6                VER257246
        PK21R050 KC2021 09 09.91619 00 33 57.41 +10 30 26.8          19.4 GXER257G02
        PK21R050 KC2021 09 10.02940500 33 54.47 +10 30 03.8          19.0 GXER257L01
        PK21R050 9C2021 09 10.03080 00 33 54.58 +10 30 04.5          19.1 GVER257G40
        PK21R050 KC2021 09 10.03173400 33 54.40 +10 30 03.4          19.3 GXER257L01
        PK21R050 KC2021 09 10.03486300 33 54.32 +10 30 02.6          19.2 GXER257L01
        PK21R050 9C2021 09 10.17977 00 33 50.53 +10 29 32.1          19.3 GVER257G40
        PK21R050 2C2021 09 10.20626 00 33 49.89 +10 29 27.1          19.3 GVER257G40
        PK21R050 2C2021 09 10.22649 00 33 49.29 +10 29 22.2          19.1 GVER257G40
        PK21R050  C2021 09 10.49754200 33 42.42 +10 28 26.4          19.65cVER257T05
        PK21R050  C2021 09 10.52549600 33 41.79 +10 28 20.1          19.59cVER257T05
        PK21R050  C2021 09 10.52854200 33 41.62 +10 28 19.7          19.72cVER257T05
        PK21R050  C2021 09 10.55670200 33 40.86 +10 28 12.6          19.58cVER257T05
        PK21R050 KC2021 09 10.89549 00 33 32.35 +10 26 58.5          19.0 RqER257L27
        PK21R050 KC2021 09 10.89805 00 33 32.27 +10 26 56.5          19.2 GVER257A71
        PK21R050 KC2021 09 10.90676 00 33 32.01 +10 26 54.7          19.3 GVER257A71
        PK21R050 KC2021 09 10.91619 00 33 31.78 +10 26 53.0          19.3 GVER257A71
        PK21R050 KC2021 09 10.94245 00 33 31.08 +10 26 48.2          19.0 RqER257L27
        PK21R050 KC2021 09 10.98945 00 33 29.82 +10 26 38.0          19.0 RqER257L27
        PK21R050 KC2021 09 11.03792 00 33 28.48 +10 26 27.5          19.6 GVER257K83
        PK21R050 KC2021 09 11.04598 00 33 28.28 +10 26 26.0          19.4 GVER257K83
        PK21R050 KC2021 09 11.05404 00 33 28.04 +10 26 23.6          19.3 GVER257K83
        PK21R050 KC2021 09 11.05420 00 33 28.03 +10 26 23.4          19.7 VqER257A77
        PK21R050 KC2021 09 11.07463 00 33 27.49 +10 26 18.9          19.6 VqER257A77
        PK21R050 KC2021 09 11.09458 00 33 26.94 +10 26 14.4          19.8 VqER257A77
        PK21R050 pC2021 09 11.37553 00 33 19.63 +10 25 13.8                qER257H06
        PK21R050 pC2021 09 11.37982 00 33 19.49 +10 25 13.0          19.4 RqER257H06
        PK21R050 KC2021 09 11.88183 00 33 06.37 +10 23 19.9          19.4 RqER257C10
        PK21R050 KC2021 09 11.89879 00 33 05.92 +10 23 16.1          19.2 RqER257C10
        PK21R050 KC2021 09 11.90620 00 33 05.70 +10 23 13.9          19.1 GXER257G02
        PK21R050 KC2021 09 11.91321 00 33 05.51 +10 23 12.6          19.1 GXER257G02
        PK21R050 KC2021 09 11.91575 00 33 05.47 +10 23 12.2          19.4 RqER257C10
        PK21R050 KC2021 09 11.92092 00 33 05.29 +10 23 11.1          19.2 GXER257G02
    
    Observer details:
    246 Klet Observatory-KLENOT.  Observers M. Tichy, J. Ticha, M. Honkova.
        Measurer M. Tichy.  1.06-m f/2.7 reflector + 2048x2048 CCD.
    703 Catalina Sky Survey.  Observer R. A. Kowalski.  Measurers B. Gray, D.
        Rankin, F. C. Shelly.  0.68-m Schmidt + 10K CCD.
    A71 Stixendorf.  Observers M. Jaeger, E. Prosperi, S. Prosperi.  Measurer M.
        Jaeger.  0.3-m f/4.0 reflector + CCD.
    A77 Observatoire Chante-Perdrix, Dauban.  Observer F. Kugel.  0.4-m f/2.8
        reflector + CCD.
    C10 Maisoncelles.  Observer J.-F. Soulier.  0.30-m f/3.8 Newtonian reflector +
        CCD.
    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, K. Chambers, T. de Boer, J. Fairlamb,
        H. Gao, C.-C. Lin, E. Magnier.  1.8-m Ritchey-Chretien + CCD.
    G02 KYSUCE Observatory, Kysucke Nove Mesto.  Observer M. Urbanik.
    G40 Slooh.com Canary Islands Observatory.  Observers B. Lutkenhoner, N. Paul.
        0.5-m f/6.8 Corrected Dall-Kirkham + CCD.
    G96 Mt. Lemmon Survey.  Observer D. Rankin.  Measurers 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, T. A. Pruyne, D. Rankin, R. L.
        Seaman, F. C. Shelly, K. W. Wierzchos.  1.5-m reflector + 10K CCD.
    H06 iTelescope Observatory, Mayhill.  Observers H. Sato, K. Yoshimoto.  0.51-m
        f/6.8 astrograph + CCD + f/4.5 focal reducer, 0.50-m f/6.8 reflector + CCD
        + f/4.5 focal reducer.
    K83 Beppe Forti Astronomical Observatory, Montelupo.  Observers M. Tombelli,
        A. Mazzanti, M. Lombardo, M. Iozzi, A. Squilloni, M. Calamandrei.
        Measurers M. Tombelli, F. Bernardi.
    L01 Visnjan Observatory, Tican.  Observers V. Dobos, E. Pettarin, D. Pujagic.
        Measurer D. Pujagic.  1.0-m f/2.9 reflector + CCD.
    L27 29PREMOTE Observatory, Dauban.  Observer J.-F. Soulier.  0.25-m f/3.5
        Newtonian reflector + CCD.
    P87 Hirao Observatory, Yamaguchi.  Observer K. Yoshimoto.  0.20-m f/8.0
        Ritchey-Chretien + CCD + f/5.4 focal reducer.
    T05 ATLAS-HKO, Haleakala.  Observers L. Denneau, J. Tonry, H. Weiland.
        Measurers L. Denneau, J. Tonry, H. Weiland, A. Fitzsimmons, J. Robinson,
        N. Erasmus.  0.5-m reflector + CCD.
    T08 ATLAS-MLO, Mauna Loa.  Observers L. Denneau, J. Tonry, H. Weiland.
        Measurers L. Denneau, J. Tonry, H. Weiland, A. Fitzsimmons, J. Robinson,
        N. Erasmus.  0.5-m reflector + CCD.
    
    Orbital elements:
        P/2021 R5 (Rankin)                                                          
    Epoch 2022 Jan. 21.0 TT = JDT 2459600.5                                         
    T 2022 Jan.  9.97761 TT                                 Rudenko                 
    q   3.3257695            (2000.0)            P               Q                  
    n   0.09374491     Peri.  166.93060     +0.89035656     -0.44672396             
    a   4.7992229      Node   219.97941     +0.40444691     +0.86464469             
    e   0.3070192      Incl.    7.85106     +0.20901651     +0.22984182             
    P  10.5                                                                         
    From 66 observations 2021 June 22-Sept. 11, mean residual 0".4.                 
                                                                                    
        P/2021 R5 (Rankin)                                                          
    Epoch 2032 July 27.0 TT = JDT 2463440.5                                         
    T 2032 July 16.31365 TT                                 Rudenko                 
    q   3.3248763            (2000.0)            P               Q                  
    n   0.09376101     Peri.  167.29473     +0.88738368     -0.45259728             
    a   4.7986733      Node   219.99388     +0.41014033     +0.86194778             
    e   0.3071259      Incl.    7.85022     +0.21055907     +0.22847697             
    P  10.5                                                                         
    From 66 observations 2021 June 22-Sept. 11, mean residual 0".4.                 
                                                                                    
        P/2021 R5 (Rankin)                                                          
    Epoch 2021 July 5.0 TT = JDT 2459400.5                                          
    T 2022 Jan.  9.55990 TT                                 Rudenko                 
    q   3.3259815            (2000.0)            P               Q                  
    n   0.09355352     Peri.  166.83814     +0.89091244     -0.44561626             
    a   4.8057660      Node   220.00033     +0.40335464     +0.86512511             
    e   0.3079186      Incl.    7.84674     +0.20875839     +0.23018404             
    P  10.5                                                                         
    From 66 observations 2021 June 22-Sept. 11, mean residual 0".4.                 
                                                                                    
    Ephemeris:
    Date    TT    R. A. (2000) Decl.     Delta      r    Elong.  Phase   m1    m2
    2021 08 12    00 40 06.0 +11 15 53   2.7291  3.4167   125.3    14.0  19.5
    ...
    2021 08 27    00 38 32.9 +11 06 34   2.5633  3.3999   140.0    11.0  19.4
    ...
    2021 09 04    00 36 14.4 +10 49 00   2.4923  3.3916   148.2     9.0  19.3
    ...
    2021 09 10    00 33 55.2 +10 30 12   2.4486  3.3857   154.5     7.3  19.2
    2021 09 11    00 33 29.5 +10 26 38   2.4422  3.3848   155.6     7.1  19.2
    2021 09 12    00 33 03.1 +10 22 56   2.4360  3.3838   156.7     6.8  19.2
    ...
    2021 09 18    00 30 12.8 +09 58 21   2.4044  3.3782   163.0     5.0  19.2
    ...
    2021 09 26    00 26 02.3 +09 20 03   2.3774  3.3712   170.9     2.7  19.2
    ...
    2021 10 11    00 17 59.8 +07 57 43   2.3756  3.3594   168.3     3.4  19.1
    
    M. P. C. Staff               (C) Copyright 2021 MPC           M.P.E.C. 2021-R257
    


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