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  • MPEC 2021-H50 : 2021 HM

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    M.P.E.C. 2021-H50                                Issued 2021 April 18, 14:01 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
    
                                     2021 HM                                 
    
    
    Observations:
         K21H00M* C2021 04 17.33144810 36 43.98 -21 14 27.4          15.86oVEH050T05
         K21H00M  C2021 04 17.33464810 37 04.10 -21 15 29.0          15.83oVEH050T05
         K21H00M  C2021 04 17.34106810 37 44.81 -21 17 32.8          15.86oVEH050T05
         K21H00M  C2021 04 17.35113010 38 49.11 -21 20 44.9          15.85oVEH050T05
         K21H00M  C2021 04 17.46293510 51 35.19 -21 53 34.5          15.93cVEH050T08
         K21H00M  C2021 04 17.46334610 51 39.65 -21 54 11.9          15.85oVEH050T05
         K21H00M  C2021 04 17.46339510 51 38.57 -21 53 42.0          15.96cVEH050T08
         K21H00M  C2021 04 17.46380310 51 42.95 -21 54 19.3          15.87oVEH050T05
         K21H00M  C2021 04 17.46385610 51 42.02 -21 53 49.6          15.89cVEH050T08
         K21H00M  C2021 04 17.46426010 51 46.35 -21 54 27.0          15.83oVEH050T05
         K21H00M  C2021 04 17.46431710 51 45.36 -21 53 57.7          15.90cVEH050T08
         K21H00M  C2021 04 17.46471710 51 49.72 -21 54 34.8          15.85oVEH050T05
         K21H00M  C2021 04 17.46477710 51 48.80 -21 54 05.3          15.93cVEH050T08
         K21H00M  C2021 04 17.46517510 51 53.06 -21 54 42.3          15.85oVEH050T05
         K21H00M KC2021 04 17.78367911 41 43.55 -23 35 11.3          15.4 GVEH050595
         K21H00M KC2021 04 17.78820011 42 27.96 -23 36 19.4                VEH050595
         K21H00M KC2021 04 17.79046111 42 50.23 -23 36 53.4          15.8 GVEH050595
         K21H00M KC2021 04 17.79249711 43 10.27 -23 37 23.3          15.7 GVEH050595
         K21H00M KC2021 04 17.79694 11 43 59.03 -23 37 51.1          14.8 GVEH050G17
         K21H00M KC2021 04 17.79762 11 44 05.75 -23 38 01.1          14.8 GVEH050G17
         K21H00M KC2021 04 17.79831 11 44 12.57 -23 38 11.6          14.9 GVEH050G17
         K21H00M KC2021 04 17.84990311 52 53.50 -23 49 59.9          14.9 GVEH050203
         K21H00M KC2021 04 17.85151711 53 20.94 -23 50 46.6          14.8 GVEH050J95
         K21H00M KC2021 04 17.85247411 53 30.83 -23 50 58.8          15.0 GVEH050J95
         K21H00M KC2021 04 17.85306611 53 25.84 -23 50 38.2          14.8 GVEH050203
         K21H00M KC2021 04 17.85553111 54 02.44 -23 51 36.1          14.9 GVEH050J95
         K21H00M KC2021 04 17.85648911 54 12.36 -23 51 47.7          14.9 GVEH050J95
         K21H00M KC2021 04 17.85970311 54 34.03 -23 51 56.5          15.4 GVEH050203
         K21H00M KC2021 04 17.86266711 55 04.55 -23 52 30.9          15.1 GVEH050203
         K21H00M KC2021 04 17.86903011 56 10.51 -23 53 46.7                VEH050204
         K21H00M KC2021 04 17.87150511 56 36.16 -23 54 13.7                VEH050204
         K21H00M KC2021 04 17.87398711 57 01.94 -23 54 41.2                VEH050204
         K21H00M KC2021 04 17.87646711 57 27.73 -23 55 08.0          14.9 GVEH050204
         K21H00M KC2021 04 17.87893411 57 53.41 -23 55 34.1                VEH050204
         K21H00M  C2021 04 17.88749 11 59 19.43 -23 56 41.6          13.8 R EH050160
         K21H00M  C2021 04 17.88834 11 59 28.60 -23 56 49.4          14.3 R EH050160
         K21H00M  C2021 04 17.88971 11 59 42.92 -23 57 01.7          14.5 R EH050160
         K21H00M  C2021 04 17.89096 11 59 55.95 -23 57 15.6          14.4 R EH050160
         K21H00M hC2021 04 17.89497912 00 33.26 -23 58 09.5          14.9 GVEH050L01
         K21H00M hC2021 04 17.89712912 00 55.91 -23 58 30.1          14.8 GVEH050L01
         K21H00M hC2021 04 17.89799312 01 05.03 -23 58 38.3          14.7 GVEH050L01
         K21H00M KC2021 04 17.89966412 03 11.28 -23 26 54.6          15.2 GXEH050Y00
         K21H00M KC2021 04 17.90080812 03 23.52 -23 27 08.4          14.8 GXEH050Y00
         K21H00M KC2021 04 17.90195012 03 35.76 -23 27 22.0          14.7 GXEH050Y00
         K21H00M KC2021 04 17.90306712 03 47.77 -23 27 34.6          14.6 GXEH050Y00
         K21H00M KC2021 04 17.90418812 03 59.76 -23 27 48.1          15.3 GXEH050Y00
         K21H00M KC2021 04 17.93754 12 10 11.84 -23 25 44.3          14.6 GVEH050X31
         K21H00M KC2021 04 17.93806 12 10 17.56 -23 25 49.4          14.6 GVEH050X31
         K21H00M KC2021 04 17.93860 12 10 23.56 -23 25 54.7          14.7 GVEH050X31
         K21H00M KC2021 04 17.93916 12 10 29.72 -23 26 00.3          14.7 GVEH050X31
         K21H00M KC2021 04 17.93969 12 10 35.66 -23 26 05.7          14.7 GVEH050X31
         K21H00M KC2021 04 17.94022 12 10 41.49 -23 26 10.6          14.6 GVEH050X31
         K21H00M KC2021 04 17.94080 12 10 47.95 -23 26 16.5          14.7 GVEH050X31
         K21H00M KC2021 04 17.95301612 11 00.06 -24 05 23.4          15.3 GVEH050104
         K21H00M KC2021 04 17.95585412 11 31.70 -24 05 41.8          14.8 GVEH050K63
         K21H00M KC2021 04 17.95762212 11 51.17 -24 05 51.5          14.6 GVEH050K63
         K21H00M KC2021 04 17.96148512 12 33.46 -24 06 14.3          14.9 GVEH050K63
         K21H00M KC2021 04 17.96314912 12 51.07 -24 06 19.9          15.1 GVEH050104
         K21H00M KC2021 04 17.96436112 13 04.45 -24 06 25.7          15.5 GVEH050104
         K21H00M  C2021 04 18.54227 14 15 42.69 -22 06 59.6          16.3 RrEH050P93
         K21H00M  C2021 04 18.54282 14 15 49.28 -22 06 43.0          16.0 RrEH050P93
         K21H00M  C2021 04 18.54337 14 15 55.85 -22 06 26.8          15.9 RrEH050P93
         K21H00M  C2021 04 18.54447 14 16 08.93 -22 05 57.4          15.8 RrEH050P93
    
    Observer details:
    104 San Marcello Pistoiese.  Observers P. Bacci, M. Maestripieri.  Measurers
        P. Bacci, L. Tesi, G. Fagioli.  0.60-m reflector + CCD.
    160 Castelmartini.  Observers M. Jaeger, E. Prosperi, S. Prosperi.  Measurer
        E. Prosperi.  0.36-m f/10.2 Schmidt-Cassegrain + CCD.
    203 GiaGa Observatory.  Observers S. Foglia, G. Galli.  Measurer G. Galli.
        0.36-m f/5.76 Schmidt-Cassegrain + CCD.
    204 Schiaparelli Observatory.  Observer L. Buzzi.  0.84-m f/3.5 reflector +
        CCD.
    595 Farra d'Isonzo.  Observer E. Pettarin.  0.61-m f/4.5 reflector + CCD.
    G17 BAS Observatory, Scandicci.  Observer L. Grazzini.  0.20-m f/10 Schmidt-
        Cassegrain + CCD + f/6.3 focal reducer.
    J95 Great Shefford.  Observer P. Birtwhistle.  0.41-m f/6.3 Schmidt-Cassegrain
        + CCD.
    K63 G. Pascoli Observatory, Castelvecchio Pascoli.  Observer R. Bacci.  0.41-m
        f/3.2 Newtonian reflector + CCD.
    L01 Visnjan Observatory, Tican.  Observers K. Korlevic, M. Himelreich.
        Measurer M. Himelreich.  1.0-m f/2.9 reflector + CCD.
    P93 Space Tracking and Communications Center, JAXA.  Observers K. Nishiyama,
        M. Hagino.  0.5-m f/2.0 reflector + CCD.
    T05 ATLAS-HKO, Haleakala.  Observers L. Denneau, J. Tonry, A. Heinze, H.
        Weiland.  Measurers L. Denneau, J. Tonry, A. Heinze, H. Weiland, A.
        Fitzsimmons, J. Robinson, N. Erasmus.  0.5-m reflector + CCD.
    T08 ATLAS-MLO, Mauna Loa.  Observers L. Denneau, J. Tonry, A. Heinze, H.
        Weiland.  Measurers L. Denneau, J. Tonry, A. Heinze, H. Weiland, A.
        Fitzsimmons, J. Robinson, N. Erasmus.  0.5-m reflector + CCD.
    X31 Galileo Galilei Observatory, Oro Verde.  Observer C. Fornari.  0.40-m f/8
        Ritchey-Chretien + CCD.
    Y00 SONEAR Observatory, Oliveira.  Observers C. Jacques, E. Pimentel, J.
        Barros.  Measurer C. Jacques.  0.28-m f/2.2 astrograph + CCD.
    
    Orbital elements:
    2021 HM                                                  Earth MOID = 0.0034 AU
    Epoch 2020 Dec. 17.0 TT = JDT 2459200.5                 Veres                   
    M 311.79482              (2000.0)            P               Q                  
    n   0.40624690     Peri.  354.98545     -0.91396690     +0.40371155             
    a   1.8055493      Node   208.93362     -0.36929484     -0.86939547             
    e   0.4419120      Incl.    4.86215     -0.16818388     -0.28490086             
    P   2.43           H   25.60          G   0.15           U   6                  
    Residuals in seconds of arc
    210417 T05  0.2+  0.5-    210417 203  0.2+  0.1-    210417 Y00  1.4-  0.7+
    210417 T05  0.4-  0.3-    210417 J95  0.1-  0.3+    210417 Y00  1.5-  0.5+
    210417 T05  0.2+  0.5-    210417 J95  0.1-  0.1-    210417 Y00  1.2-  1.0+
    210417 T05  0.3+  0.5-    210417 203  0.3-  0.1-    210417 Y00  1.8-  0.5+
    210417 T08  0.3-  0.3-    210417 J95  0.3-  0.2+    210417 X31  1.5+  0.5+
    210417 T05  0.3+  0.4-    210417 J95  0.1-  0.3+    210417 X31  1.2+  0.5+
    210417 T08  0.4-  0.2-    210417 203  0.2+  0.1+    210417 X31  1.0+  0.6+
    210417 T05  0.5-  0.2-    210417 203  0.0   0.0     210417 X31  1.1+  0.4+
    210417 T08  0.3+  0.1-    210417 204  0.3-  0.4-    210417 X31  2.2+  0.2+
    210417 T05  0.1-  0.3-    210417 204  0.7-  0.1+    210417 X31  0.4+  0.5+
    210417 T08  0.4-  0.5-    210417 204  0.0   0.3-    210417 X31  2.3+  0.1+
    210417 T05  0.1-  0.4-    210417 204  0.1+  0.4-    210417 104  0.0   0.7+
    210417 T08  0.2+  0.4-    210417 204  0.1+  0.2-    210417 K63  0.4+  0.4-
    210417 T05  0.5-  0.3-    210417 160 (2.7-  1.8-)   210417 K63  1.8+  0.2-
    210417 595  0.2-  0.0     210417 160  0.3+  1.0-    210417 K63 (0.4+  2.0-)
    210417 595  0.2+  0.2+    210417 160  0.6+  0.2+    210417 104 (2.3-  0.0 )
    210417 595  0.5+  0.0     210417 160  0.2-  1.4-    210417 104  0.6-  0.4+
    210417 595  0.3+  0.3+    210417 L01  0.3-  0.5+    210418 P93  0.0   0.9-
    210417 G17  0.5-  0.1+    210417 L01  0.1-  0.0     210418 P93  0.2+  0.1+
    210417 G17  0.5-  0.1+    210417 L01  0.1+  0.3-    210418 P93  0.3+  0.7+
    210417 G17  0.6-  0.3-    210417 Y00  1.0-  1.0+    210418 P93  0.3-  1.1-
    
    Ephemeris:
    2021 HM                  a,e,i = 1.81, 0.44, 5                   q = 1.0077
    Date    TT    R. A. (2000) Decl.     Delta      r    Elong.  Phase     V
    2021 03 19    07 45 04.5 -06 45 03   0.1115  1.0517   117.5    57.1    23.0
    ...
    2021 04 03    07 46 28.4 -07 35 02   0.05793 1.0163   105.0    71.8    22.0
    ...
    2021 04 11    08 02 23.1 -09 20 06   0.02832 1.0085   102.2    76.2    20.5
    ...
    2021 04 17    10 04 17.3 -19 13 38   0.0068791.0080   127.3    52.4    16.7
    2021 04 18    12 20 24.9 -23 40 54   0.0046511.0083   156.3    23.6    15.1
    2021 04 19    15 38 26.1 -16 56 43   0.0049971.0088   152.5    27.4    15.3
    ...
    2021 04 25    18 55 55.0 +02 23 53   0.02551 1.0138   107.4    71.2    20.2
    ...
    2021 05 03    19 14 47.0 +04 28 45   0.05526 1.0275   109.2    67.9    21.8
    ...
    2021 05 18    19 16 18.6 +04 48 25   0.1095  1.0725   121.3    53.7    22.9
    
    M. P. C. Staff               (C) Copyright 2021 MPC           M.P.E.C. 2021-H50
    


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