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  • MPEC 2019-Q28 : 2017 BR31

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    M.P.E.C. 2019-Q28                                Issued 2019 August 21, 11:21 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
    
                                    2017 BR31                                
    
    
                               Revision to MPEC 2017-B141                           
    
    Additional Observations:
         K17B31R  C2019 08 19.33459919 59 24.657-07 52 05.04         23.99GVEQ028T14
         K17B31R  C2019 08 19.33856419 59 24.331-07 52 05.92         24.08GVEQ028T14
         K17B31R  C2019 08 19.34252319 59 24.007-07 52 06.81         23.91GVEQ028T14
         K17B31R  C2019 08 20.29593219 58 08.621-07 55 52.00         24.54GVEQ028T14
         K17B31R  C2019 08 20.29990419 58 08.304-07 55 53.03         24.18GVEQ028T14
    
    Observer details:
    T14 Mauna Kea-UH/Tholen NEO Follow-Up (CFHT).  Observer C. Wipper.  
        Measurer D. J. Tholen.  3.6-m f/4.1 reflector + MegaCam.
    
    First and last observations above in comparison with prediction:
    Residuals in seconds of arc (or two decimals in degrees), reference and Delta-T
    190819 T14 0.03+ 0.01+    190820 T14 0.03+ 0.01+    MPO409576   +0.10 days
    
    Orbital elements:
    2017 BR31                                           PHA, Earth MOID = 0.0250 AU
    Epoch 2019 Apr. 27.0 TT = JDT 2458600.5                 Williams
    M 265.95510              (2000.0)            P               Q
    n   0.31301665     Peri.  184.77297     +0.24346462     -0.96106200
    a   2.1482810      Node   251.18049     +0.89438294     +0.27459551
    e   0.5536759      Incl.    7.93741     +0.37523878     -0.03093750
    P   3.15           H   21.4           G   0.15           U   1
    Residuals in seconds of arc
    170128 F51  0.0   0.0     170131 291  0.2-  0.1+    170214 807  0.6+  0.3+
    170128 F51  0.1-  0.0     170131 291  0.0   0.3-    170214 807  0.4+  0.6+
    170128 F51  0.2+  0.2+    170131 691  0.7+  0.2+    170214 291  0.1-  0.5-
    170129 568  0.1+  0.0     170131 691 (1.8+  0.2+)   170214 291  0.1-  0.7-
    170129 568  0.2+  0.0     170201 T12  0.0   0.0     170214 291  0.2-  0.3-
    170129 568  0.2+  0.0     170201 T12  0.1-  0.0     170221 291  0.2+  0.4-
    170129 K93  0.1+  0.3-    170202 807  0.0   0.1+    170221 291  0.0   0.0
    170129 K93  0.2+  0.1-    170202 807  0.1+  0.1-    170221 291  0.1+  0.3+
    170129 K93  0.2+  0.1-    170202 807  0.0   0.1-    170315 695  0.1-  0.3+
    170130 807  0.0   0.3+    170202 I52  0.0   0.1-    170315 695  0.0   0.2+
    170130 807  0.2+  0.0     170202 I52  0.8-  0.8-    170315 695  0.0   0.2+
    170130 807  0.5+  0.1+    170202 I52  0.3+  0.0     170329 291  0.2-  0.6+
    170130 I52  0.0   0.1-    170202 I52  0.5-  0.0     170329 291  0.1-  0.2-
    170130 I52  0.2-  0.2-    170206 807  0.0   0.1+    170329 291  0.4+  0.3-
    170130 I52  0.1+  0.3-    170206 807  0.0   0.4+    190819 T14  0.0   0.0
    170130 I52  0.2-  0.1+    170206 807  0.4-  0.0     190819 T14  0.0   0.0
    170130 691  0.5-  0.2-    170211 695  0.1+  0.2-    190819 T14  0.0   0.1+
    170130 691  0.4-  0.3+    170211 695  0.1-  0.1-    190820 T14  0.0   0.0
    170130 691  0.6+  0.1-    170211 695  0.0   0.1+    190820 T14  0.1+  0.1-
    170131 291  0.1-  0.5+    170214 807  0.3+  0.0
    
    Ephemeris:
    2017 BR31                a,e,i = 2.15, 0.55, 8                   q = 0.9588
    Date    TT    R. A. (2000) Decl.     Delta      r    Elong.  Phase     V
    2019 07 22    20 39 09.1 -06 44 21   1.3311  2.3241   163.8     7.0    24.4
    ...
    2019 08 06    20 18 19.5 -07 07 44   1.2361  2.2328   165.5     6.5    24.1
    ...
    2019 08 14    20 06 45.3 -07 32 16   1.2101  2.1823   157.9    10.1    24.2
    ...
    2019 08 20    19 58 31.8 -07 54 38   1.2013  2.1436   151.0    13.2    24.2
    2019 08 21    19 57 13.5 -07 58 37   1.2007  2.1370   149.9    13.7    24.2
    2019 08 22    19 55 56.6 -08 02 39   1.2002  2.1305   148.7    14.3    24.2
    ...
    2019 08 28    19 48 48.1 -08 27 52   1.2022  2.0908   141.7    17.4    24.3
    ...
    2019 09 05    19 41 05.8 -09 02 46   1.2155  2.0368   132.4    21.4    24.4
    ...
    2019 09 20    19 33 28.8 -10 04 53   1.2632  1.9324   116.4    27.7    24.6
    
    A. U. Tomatic                (C) Copyright 2019 MPC           M.P.E.C. 2019-Q28
    


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