[Iaude] MPEC J171: 2021 JR4 [a=2.06,e=0.52,i=2.8,H=25.0]

mpec at marsden.cfa.harvard.edu mpec at marsden.cfa.harvard.edu
Tue May 11 18:13:52 EDT 2021


M.P.E.C. 2021-J171                                 Issued 2021 May 11, 22:12 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

                                    2021 JR4                                    


Observations:
     K21J04R  C2021 04 15.25139711 30 37.139+09 48 25.52         22.23GVEJ171F51
     K21J04R  C2021 04 15.26315611 30 35.843+09 48 24.47         22.72GVEJ171F51
     K21J04R  C2021 04 15.27489611 30 34.549+09 48 23.15         23.03GVEJ171F51
     K21J04R  C2021 04 15.28667011 30 33.242+09 48 22.03         22.21GVEJ171F51
     K21J04R* C2021 05 10.16063910 20 42.48 -02 44 02.0          20.26GVEJ171G96
     K21J04R  C2021 05 10.16632110 20 39.30 -02 44 42.3          20.05GVEJ171G96
     K21J04R  C2021 05 10.17200210 20 36.09 -02 45 22.5          20.99GVEJ171G96
     K21J04R  C2021 05 10.17768310 20 32.90 -02 46 03.9          19.26GVEJ171G96
     K21J04R KC2021 05 10.23967410 19 58.66 -02 53 25.3          19.96GVEJ171I52
     K21J04R KC2021 05 10.24090610 19 58.00 -02 53 34.6          20.48GVEJ171I52
     K21J04R KC2021 05 10.24213710 19 57.29 -02 53 43.6          19.74GVEJ171I52
     K21J04R KC2021 05 10.24336810 19 56.68 -02 53 51.9          20.67GVEJ171I52
     K21J04R KC2021 05 11.13583510 12 01.56 -04 51 28.6          20.22GVEJ171I52
     K21J04R KC2021 05 11.13878810 11 59.54 -04 51 54.3          19.48GVEJ171I52
     K21J04R KC2021 05 11.13977310 11 58.91 -04 52 02.8          19.68GVEJ171I52
     K21J04R  C2021 05 11.17119210 11 37.81 -04 56 33.4          19.88GVEJ171G96
     K21J04R  C2021 05 11.17639310 11 34.29 -04 57 18.7          20.39GVEJ171G96
     K21J04R  C2021 05 11.18159310 11 30.81 -04 58 03.6          20.42GVEJ171G96
     K21J04R  C2021 05 11.18679510 11 27.32 -04 58 49.3          21.30GVEJ171G96

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.
G96 Mt. Lemmon Survey.  Observers H. Groeller, K. W. Wierzchos.  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.
I52 Steward Observatory, Mt. Lemmon Station.  Observers G. J. Leonard, T. A.
    Pruyne.  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.  1.0-m reflector + CCD.

Orbital elements:
2021 JR4                                                 Earth MOID = 0.0122 AU
Epoch 2020 Dec. 17.0 TT = JDT 2459200.5                 Veres                   
M 306.03026              (2000.0)            P               Q                  
n   0.33306415     Peri.  211.20241     -0.36340044     +0.93116615             
a   2.0611873      Node    37.51118     -0.84446598     -0.31586490             
e   0.5151977      Incl.    2.77604     -0.39346833     -0.18209604             
P   2.96           H   25.08          G   0.15           U   8                  
Residuals in seconds of arc
210415 F51  0.2+  0.1-    210510 G96  0.5-  0.9-    210511 I52  0.1+  0.1-
210415 F51  0.0   0.0     210510 I52  0.0   0.5+    210511 G96  0.4+  0.4+
210415 F51  0.1-  0.0     210510 I52  0.1+  0.0     210511 G96  0.1-  0.0
210415 F51  0.1-  0.2+    210510 I52  0.4-  0.1-    210511 G96  0.1-  0.1+
210510 G96  0.3+  0.0     210510 I52  0.5+  0.5+    210511 G96  0.2-  0.5-
210510 G96  0.2+  0.1+    210511 I52  0.2+  0.2+
210510 G96  0.3-  0.2+    210511 I52  0.4-  0.1-

Ephemeris:
2021 JR4                 a,e,i = 2.06, 0.52, 3                   q = 0.9993
Date    TT    R. A. (2000) Decl.     Delta      r    Elong.  Phase     V
2021 04 11    11 36 41.2 +09 51 36   0.1673  1.1487   149.0    26.7    22.7
...
2021 04 26    11 12 46.8 +08 22 33   0.09951 1.0730   130.1    45.8    22.0
...
2021 05 04    10 52 45.9 +04 45 53   0.06557 1.0418   119.2    57.7    21.3
...
2021 05 10    10 22 03.9 -02 23 10   0.04115 1.0236   108.5    69.3    20.6
2021 05 11    10 13 24.2 -04 29 44   0.03729 1.0210   106.2    71.8    20.5
2021 05 12    10 02 46.3 -07 04 47   0.03355 1.0185   103.5    74.7    20.4
...
2021 05 18    07 01 02.5 -38 27 54   0.01832 1.0068    74.8   104.2    20.2
...
2021 05 26    01 16 27.2 -33 05 22   0.03801 0.9996    68.3   109.7    22.1
...
2021 06 10    00 12 55.6 -21 27 10   0.09927 1.0121    85.4    89.0    23.2

M. P. C. Staff               (C) Copyright 2021 MPC           M.P.E.C. 2021-J171




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