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  • MPEC 2023-R189 : 2021 QE2

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    M.P.E.C. 2023-R189                           Issued 2023 September 14, 11:50 UT
    
         The Minor Planet Electronic Circulars contain information on unusual
             minor planets, routine data on comets and natural satellites,
             and occasional editorial announcements.  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 QE2                                 
    
    
                               Revision to MPEC 2021-Q101                           
    
    Additional Observations:
         K21Q02E  C2023 09 07.58645000 46 08.371+20 22 21.00         21.00GVER189F51
         K21Q02E  C2023 09 07.59829200 46 00.324+20 21 58.20         21.19GVER189F51
         K21Q02E  C2023 09 07.59829200 46 00.325+20 21 58.20         21.19GVER189F51
         K21Q02E  C2023 09 10.39237500 15 00.351+18 40 11.12         20.94GVER189F51
         K21Q02E  C2023 09 10.39237500 15 00.351+18 40 11.10         20.95GVER189F51
         K21Q02E 7C2023 09 11.11915500 06 43.180+18 08 22.74         21.2 GVER189Z84
         K21Q02E 7C2023 09 11.12774800 06 37.163+18 07 59.30         21.3 GVER189Z84
         K21Q02E 7C2023 09 11.13374300 06 32.983+18 07 42.93         20.9 GVER189Z84
         K21Q02E 7C2023 09 11.14834300 06 22.742+18 07 02.53         21.3 GVER189Z84
         K21Q02E 7C2023 09 11.15518500 06 17.966+18 06 43.65         21.1 GVER189Z84
         K21Q02E  C2023 09 11.33459300 04 22.865+17 58 57.88         20.93GVER189F51
         K21Q02E  C2023 09 11.33459300 04 22.865+17 58 57.86         20.95GVER189F51
         K21Q02E  C2023 09 11.34617300 04 14.725+17 58 27.45         20.70GVER189F51
         K21Q02E  C2023 09 11.34617300 04 14.726+17 58 27.45         20.70GVER189F51
         K21Q02E  C2023 09 11.35775600 04 06.587+17 57 57.05         20.80GVER189F51
         K21Q02E  C2023 09 11.35775600 04 06.588+17 57 57.05         20.79GVER189F51
         K21Q02E  C2023 09 11.36938000 03 58.415+17 57 26.12         20.71GVER189F51
         K21Q02E  C2023 09 11.36938000 03 58.414+17 57 26.12         20.71GVER189F51
         K21Q02E  C2023 09 12.98583 23 45 44.44 +16 39 07.3          20.2 GVER189K88
         K21Q02E  C2023 09 12.99028 23 45 41.33 +16 38 53.4          20.5 GVER189K88
         K21Q02E KC2023 09 13.00529023 45 31.05 +16 38 08.6          20.4 RoER189K88
         K21Q02E KC2023 09 13.00857223 45 28.77 +16 37 58.7          20.5 RoER189K88
         K21Q02E KC2023 09 13.01185523 45 26.46 +16 37 48.0          20.3 RoER189K88
         K21Q02E 1C2023 09 13.07678 23 44 42.27 +16 34 25.1          20.9 VXER189033
         K21Q02E 1C2023 09 13.07770 23 44 41.65 +16 34 22.0          21.0 VXER189033
         K21Q02E 1C2023 09 13.07862 23 44 41.01 +16 34 19.6          20.9 VXER189033
         K21Q02E 6C2023 09 13.12577223 44 08.810+16 32 10.47         21.0 GVER189Z84
         K21Q02E 6C2023 09 13.13716923 44 00.980+16 31 35.11         21.0 GVER189Z84
         K21Q02E 6C2023 09 13.14855923 43 53.151+16 30 59.12         20.9 GVER189Z84
         K21Q02E KC2023 09 13.15866623 43 51.85 +16 30 28.0          20.6 VuER189H21
         K21Q02E KC2023 09 13.16146523 43 49.91 +16 30 19.6          20.5 VuER189H21
         K21Q02E KC2023 09 13.16426323 43 47.96 +16 30 11.2          21.2 VuER189H21
         K21Q02E KC2023 09 13.16612923 43 46.68 +16 30 05.3          21.2 VuER189H21
         K21Q02E KC2023 09 13.17317 23 43 42.33 +16 29 43.9          20.8 GVER189H36
         K21Q02E KC2023 09 13.19455 23 43 27.61 +16 28 39.9          20.6 GVER189H36
         K21Q02E !C2023 09 13.30887 23 42 09.69 +16 22 53.4          20.9 RVER189673
         K21Q02E !C2023 09 13.32267 23 42 00.12 +16 22 11.2                VER189673
         K21Q02E  C2023 09 14.34596923 30 46.722+15 28 29.56         20.83wXER189F52
         K21Q02E  C2023 09 14.35747823 30 38.888+15 27 53.10         21.06wXER189F52
         K21Q02E  C2023 09 14.36900623 30 31.027+15 27 16.38         20.98wXER189F52
         K21Q02E  C2023 09 14.38057523 30 23.127+15 26 39.40         21.03wXER189F52
    
    Observer details:
    033 Karl Schwarzschild Observatory, Tautenburg.  Observers S. Melnikov, C.
        Hoegner, F. Ludwig, M. Hartmann, B. Stecklum.  Measurer B. Stecklum.
        1.34-m f/3 Schmidt + CCD.
    673 Table Mountain Observatory, Wrightwood.  Observer J. Pittichova.  1.0-m
        f/15 reflector + CCD.
    F51 Pan-STARRS 1, Haleakala.  Observers J. Bulger, K. Chambers, T. Lowe, P.
        Minguez, A. Schultz, I. Smith.  Measurers S. Chastel, J. Fairlamb, M.
        Huber, Y. Ramanjooloo, R. Wainscoat, R. Weryk.  1.8-m Ritchey-Chretien +
        CCD.
    F52 Pan-STARRS 2, Haleakala.  Observers J. Bulger, T. Lowe, P. Minguez, A.
        Schultz, I. Smith.  Measurers K. Chambers, T. de Boer, J. Bulger, J.
        Fairlamb, H. Gao, M. Huber, C.-C. Lin, T. Lowe, E. Magnier, P. Minguez, Y.
        Ramanjooloo, A. Schultz, I. Smith, R. Wainscoat, R. Weryk.  1.8-m Ritchey-
        Chretien + CCD.
    H21 Astronomical Research Observatory, Westfield.  Observer R. Holmes.
        Measurers T. Linder, R. Holmes, L. Horn.  0.76-m f/3.0 astrograph + CCD.
    H36 Sandlot Observatory, Scranton.  Observer G. Hug.  .57 meter f/4.2 + CCD.
    K88 GINOP-KHK, Piszkesteto.  Observer K. Sarneczky.  0.60-m Schmidt + CCD.
    Z84 Calar Alto-Schmidt.  Observers R. Kresken, F. Ocana, M. Micheli, L.
        Conversi.  0.8-m f/3 Schmidt + CCD.
    
    First and last observations above in comparison with prediction:
    Residuals in seconds of arc (or two decimals in degrees), reference and Delta-T
    230907 F51 0.47- 0.14-    230914 F52 0.59- 0.26-    MPO750185   -0.09 days
    
    Orbital elements:
    2021 QE2                                                 Earth MOID = 0.0070 AU
    Epoch 2023 Sept. 13.0 TT = JDT 2460200.5                Veres                   
    M 160.46910              (2000.0)            P               Q                  
    n   1.50218756     Peri.  213.96344     -0.99905801     -0.02004825             
    a   0.7550689      Node   324.82663     +0.03515613     -0.89384626             
    e   0.4879643      Incl.    3.83077     -0.02543909     -0.44792515             
    P   0.66           H   24.47          G   0.15           U   2                  
    Residuals in seconds of arc
    210830 T08  0.5+  0.2-    210831 E23  1.0+  0.6+    230910 F51  0.2+  0.1-
    210830 T08  0.2-  0.3+    210831 E23  0.1+  0.1-    230911 Z84  0.1-  0.0
    210830 T08  0.6-  0.3-    210831 N51  0.1-  0.4-    230911 Z84  0.1+  0.1+
    210830 T08  0.0   0.3+    210831 N51  0.4+  0.5+    230911 Z84  0.4+  0.2+
    210830 104  0.9-  0.3-    210831 C82  1.1-  0.4+    230911 Z84  0.1+  0.0
    210830 104  0.3-  0.2+    210831 A17  0.8+  0.4-    230911 Z84  0.2+  0.0
    210830 104  0.4-  0.2-    210831 A17  0.2+  0.6-    230911 F51  0.2+  0.0
    210830 203  0.4-  0.5+    210831 C82  0.2+  0.4+    230911 F51  0.2-  0.0
    210830 203  0.1-  0.3+    210831 A17  0.4+  0.3+    230911 F51  0.3-  0.1+
    210830 K78  0.2+  0.1+    210831 C82  0.4-  1.3-    230911 F51  0.2-  0.1-
    210830 K78  0.7+  0.1+    210831 033  0.1-  0.0     230912 K88  0.1-  0.3-
    210830 595  0.4+  0.2-    210831 033  0.2-  0.2-    230912 K88  0.5-  0.6-
    210830 K78  0.2-  0.1+    210831 A57  0.2-  0.1-    230913 K88  1.0+  0.2+
    210830 203  0.3+  0.0     210831 033  0.0   0.1-    230913 K88  0.8+  0.3+
    210830 595  0.3-  0.5-    210831 033  0.0   0.3-    230913 K88  0.2+  0.3-
    210830 587  0.2+  0.2-    210831 033  0.1-  0.1-    230913 033  0.1-  0.1-
    210830 587  0.3-  0.4-    210831 A57  0.0   0.1-    230913 033  0.0   0.3-
    210830 L01  0.1-  0.8-    210831 A57  0.5-  0.5+    230913 033  0.1-  0.1+
    210830 L01  0.9-  0.7+    210902 033  0.1-  0.4+    230913 Z84  0.0   0.1-
    210830 958  0.5+  0.0     210902 033  0.2+  0.1-    230913 Z84  0.3+  0.2+
    210830 958  0.9+  0.9-    210902 033  0.3+  0.1+    230913 Z84  0.3+  0.0
    210830 958  0.5+  0.1+    210902 033  0.2+  0.2+    230913 H21  0.1+  0.1+
    210831 L74  0.3+  0.6+    210907 291  0.6+  0.0     230913 H21  0.0   0.1+
    210831 L74  1.2+  0.8-    210907 291  0.1+  0.2-    230913 H21  0.3-  0.1+
    210831 858  0.1+  0.1+    210907 291  0.0   0.1-    230913 H21  0.2-  0.2-
    210831 858  0.1-  0.1+    210910 691  0.1-  0.1-    230913 H36  0.1+  0.2+
    210831 858  0.3-  0.0     210910 691  0.2-  0.3-    230913 H36  0.5+  0.5+
    210831 858  0.2-  0.0     210910 691  0.3+  0.1-    230913 673  4.9-  1.6-
    210831 858  0.1+  0.2-    210914 807  0.1+  0.1-    230913 673  4.7-  1.4-
    210831 734  0.1+  0.7+    210914 807  0.1-  0.1+    230914 F52  0.0   0.1-
    210831 734  0.0   0.2-    210914 807  0.3-  0.2+    230914 F52  0.1+  0.0
    210831 734  0.2-  0.4-    230907 F51  0.0   0.1-    230914 F52  0.1+  0.0
    210831 E23  1.3+  0.3+    230907 F51  0.0   0.1-    230914 F52  0.1+  0.1-
    
    Ephemeris:
    2021 QE2                 a,e,i = 0.76, 0.49, 4                   q = 0.3866
    Date    TT    R. A. (2000) Decl.     Delta      r    Elong.  Phase     V
    2023 08 15    03 25 40.6 +21 28 56   0.1890  1.0212    87.1    82.2    23.8
    ...
    2023 08 30    02 06 53.9 +22 35 10   0.1368  1.0816   118.4    55.2    22.3
    ...
    2023 09 07    00 52 31.5 +20 39 45   0.1182  1.1028   141.4    34.8    21.5
    ...
    2023 09 13    23 45 36.1 +16 39 07   0.1146  1.1138   158.4    19.4    21.0
    2023 09 14    23 34 31.7 +15 47 12   0.1151  1.1153   160.4    17.6    20.9
    2023 09 15    23 23 40.1 +14 53 03   0.1159  1.1166   161.7    16.4    20.9
    ...
    2023 09 21    22 25 50.2 +09 12 11   0.1272  1.1221   156.5    20.9    21.3
    ...
    2023 09 29    21 33 00.3 +02 46 10   0.1554  1.1230   138.4    36.3    22.2
    ...
    2023 10 14    20 48 25.6 -04 02 34   0.2263  1.1049   112.7    56.4    23.5
    
    A. U. Tomatic                (C) Copyright 2023 MPC           M.P.E.C. 2023-R189
    


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