[Iaude] MPEC K67: 2021 HY9 = 2021 HW2

[mpec at marsden.cfa.harvard.edu]

M.P.E.C. 2021-K67                                  Issued 2021 May 21, 02:36 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 HY9 = 2021 HW2                               

                           Revision to MPEC 2021-HY9

Observations:
     K21H09Y  C2021 04 18.38126 13 27 32.42 +25 16 27.9                VEK067G96

Observer details:
G96 Mt. Lemmon Survey.  Observer K. W. Wierzchos.  Measurers E. J.
    Christensen, B. Gray, D. Rankin, F. C. Shelly.  1.5-m reflector + 10K CCD.

Orbital elements:
2021 HY9 = 2021 HW2                                      Earth MOID = 0.0103 AU
Id. F. Manca
Epoch 2020 Dec. 17.0 TT = JDT 2459200.5                 Veres
M 314.32874              (2000.0)            P               Q
n   0.32673639     Peri.  196.72715     -0.66561767     +0.73891748
a   2.0877142      Node    31.77485     -0.65994105     -0.51729976
e   0.5194419      Incl.   11.46425     -0.34846941     -0.43174289
P   3.02           H   28.1           G   0.15           U   6
Residuals in seconds of arc
210417 G96  0.2-  0.5-    210420 U68  0.5+  1.2-    210421 U68  0.8+  0.3-
210417 G96  0.5+  0.4+    210420 U68  0.5-  0.7+    210421 U68  0.3+  0.4-
210417 G96  0.7+  0.3-    210420 U68  0.1-  0.1+    210422 J95  0.1+  0.6+
210418 G96  0.8+  1.7-    210420 U68  0.5+  1.2+    210422 J95  0.2+  0.1-
210418 G96  0.2-  0.5+    210421 U68  0.3+  0.5-    210422 J95  0.4-  0.5-
210418 G96  1.3-  0.9+    210421 U68  0.6-  0.6+

Ephemeris:
2021 HY9                 a,e,i = 2.09, 0.52, 11                  q = 1.0033
Date    TT    R. A. (2000) Decl.     Delta      r    Elong.  Phase     V
2021 04 21    14 16 31.2 -00 24 30   0.01517 1.0197   167.4    12.4    19.8
...
2021 05 06    23 33 24.9 -55 57 40   0.07943 1.0029    83.5    92.0    25.9
...
2021 05 14    23 50 47.5 -53 25 21   0.1236  1.0078    85.2    87.8    26.7
...
2021 05 20    23 56 58.6 -52 23 35   0.1554  1.0178    87.8    83.4    27.0
2021 05 21    23 57 43.5 -52 15 39   0.1606  1.0199    88.3    82.7    27.1
2021 05 22    23 58 24.6 -52 08 15   0.1657  1.0222    88.8    81.9    27.1
...
2021 05 28    00 01 22.7 -51 33 39   0.1955  1.0389    92.1    77.1    27.3
...
2021 06 05    00 02 33.7 -51 10 13   0.2324  1.0682    97.0    70.5    27.5
...
2021 06 20    23 54 44.0 -51 21 25   0.2931  1.1412   108.0    57.9    27.8

M. P. C. Staff               (C) Copyright 2021 MPC           M.P.E.C. 2021-K67