[Iaude] MPEC E81: 2011 LH21 [a=1.79,e=0.42,i=6.9,H=20.0]

[mpec at mpcdb1.cfa.harvard.edu]

M.P.E.C. 2018-E81                                Issued 2018 Mar. 13, 11:33 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


                                   2011 LH21
 
                           Revision to MPEC 2011-L58
 
Additional Observations:
     K11L21H |C2018 03 12.37030 13 29 02.84 -23 08 53.6          21.6 GUEE081807
     K11L21H |C2018 03 12.37782 13 29 02.59 -23 08 55.3          21.7 GUEE081807
     K11L21H |C2018 03 12.38558 13 29 02.35 -23 08 57.3          21.7 GUEE081807
     K11L21H |C2018 03 13.12725 13 28 40.30 -23 12 02.1          21.8 GUEE081807
     K11L21H |C2018 03 13.13968 13 28 39.87 -23 12 05.4          21.7 GUEE081807
     K11L21H |C2018 03 13.15172 13 28 39.46 -23 12 08.5          21.7 GUEE081807
 
Observer details:
807 Cerro Tololo.  Observers T. Linder, R. Holmes.  1.00-m f/10.0 astrograph
    + CCD.
 
First and last observations above in comparison with prediction:
Residuals in seconds of arc (or two decimals in degrees), reference and Delta-T
180312 807 0.07+ 0.02-    180313 807 0.07+ 0.02-    MPO423762   -0.11 day
 
Orbital elements:
2011 LH21                                                Earth MOID = 0.0627 AU
Epoch 2018 Mar. 23.0 TT = JDT 2458200.5                 MPC
M 290.95107              (2000.0)            P               Q
n   0.41062519     Peri.   37.20784     +0.65098676     +0.74964536
a   1.7926919      Node   273.73604     -0.72205451     +0.56300549
e   0.4150223      Incl.    6.87014     -0.23420829     +0.34793197
P   2.40           H   20.0           G   0.15           U   1
Residuals in seconds of arc
110612 F51  0.0   0.2+    110614 G96  0.5+  0.5-    111117 291  0.0   0.0
110612 F51  0.0   0.3+    110614 G96  0.2+  0.5-    111117 291  0.5-  0.8+
110612 F51  0.3-  0.0     110621 291  0.3+  1.0+    111117 291  0.1+  0.2+
110613 807  0.5-  0.1-    110621 291  0.7-  0.7+    180312 807  0.1+  0.1+
110613 807  0.2-  0.5-    110627 291  0.4+  0.5-    180312 807  0.1+  0.3+
110613 G96  0.7-  0.0     110627 291  1.4-  0.2-    180312 807  0.3+  0.2+
110613 G96  0.4+  0.3+    110819 T12  0.1+  0.0     180313 807  0.1+  0.3+
110613 G96  1.0+  0.1-    110819 T12  0.0   0.1-    180313 807  0.0   0.2+
110613 G96  0.5+  0.4-    110819 T12  0.1+  0.1-    180313 807  0.0   0.2+
110614 G96  0.2+  0.3+    110829 568  0.0   0.1+
110614 G96  0.1+  0.1-    110829 568  0.0   0.1+

Ephemeris:
2011 LH21                a,e,i = 1.79, 0.42, 7                   q = 1.0487
Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase     V
2018 02 11    13 27 06.5 -19 46 28   1.4094  2.0236   114.1    26.4    23.5
...
2018 02 26    13 31 53.3 -21 45 50   1.1919  1.9541   126.9    23.9    23.0
...
2018 03 06    13 31 20.1 -22 37 00   1.0860  1.9153   134.3    21.8    22.6
...
2018 03 12    13 29 14.0 -23 07 19   1.0123  1.8854   140.1    19.8    22.4
2018 03 13    13 28 43.9 -23 11 33   1.0006  1.8804   141.1    19.4    22.4
2018 03 14    13 28 11.1 -23 15 32   0.9890  1.8754   142.1    19.0    22.3
...
2018 03 20    13 23 58.1 -23 33 29   0.9230  1.8446   148.0    16.6    22.0
...
2018 03 28    13 15 52.3 -23 38 55   0.8452  1.8028   155.9    13.1    21.7
...
2018 04 12    12 54 22.6 -22 38 36   0.7346  1.7215   164.5     8.9    21.1

A. U. Tomatic                (C) Copyright 2018 MPC           M.P.E.C. 2018-E81