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  • MPEC 2023-Y21 : 2017 AL4

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    M.P.E.C. 2023-Y21                             Issued 2023 December 17, 14:08 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
    
                                    2017 AL4                                 
    
    
                               Revision to MPEC 2017-A37                            
    
    Additional Observations:
         K17A04L  C2023 07 26.44063422 17 19.705+24 11 16.56         23.05GVEY021F52
         K17A04L  C2023 07 26.45279922 17 19.806+24 11 59.43         23.34GVEY021F52
         K17A04L  C2023 07 26.46516322 17 19.932+24 12 42.47         23.11GVEY021F52
         K17A04L  C2023 10 31.58640110 31 43.832+57 47 34.31         22.00GVEY021F51
         K17A04L  C2023 10 31.59927110 31 42.867+57 46 50.42         21.75GVEY021F51
         K17A04L  C2023 11 24.57323610 10 46.079+32 43 12.16         22.11GVEY021F51
         K17A04L  C2023 11 24.58290310 10 45.328+32 42 36.20         22.09GVEY021F51
         K17A04L  C2023 11 24.59903210 10 44.095+32 41 35.22         21.68GVEY021F51
         K17A04L  C2023 11 24.60997010 10 43.249+32 40 53.89         22.05GVEY021F51
         K17A04L  C2023 12 15.53156809 40 02.111+11 14 58.32         21.73wXEY021F52
         K17A04L  C2023 12 15.55505409 39 58.927+11 13 39.09         21.40wXEY021F52
         K17A04L 0C2023 12 16.65536409 37 43.262+10 12 02.66         21.75GVEY021T12
         K17A04L 0C2023 12 16.65669409 37 43.082+10 11 58.15         22.00GVEY021T12
         K17A04L 0C2023 12 16.65807409 37 42.891+10 11 53.53         21.85GVEY021T12
         K17A04L 0C2023 12 16.65950709 37 42.691+10 11 48.77         21.75GVEY021T12
         K17A04L 1C2023 12 17.43369509 36 07.520+09 28 55.31         21.47GVEY021G96
         K17A04L 1C2023 12 17.43881209 36 06.844+09 28 38.86         21.63GVEY021G96
         K17A04L 1C2023 12 17.44393309 36 06.131+09 28 22.12         21.46GVEY021G96
         K17A04L 1C2023 12 17.44906809 36 05.360+09 28 04.37         22.01GVEY021G96
         K17A04L  C2023 12 17.47185309 36 02.060+09 26 49.06         21.4 GVEY021H01
         K17A04L  C2023 12 17.47695109 36 01.352+09 26 32.29         21.5 GVEY021H01
         K17A04L  C2023 12 17.48617609 36 00.060+09 26 01.84         21.1 GVEY021H01
         K17A04L  C2023 12 17.49411709 35 58.946+09 25 35.58         21.6 GVEY021H01
    
    Observer details:
    F51 Pan-STARRS 1, Haleakala.  Observers J. Herman, T. Lowe, P. Minguez, A.
        Schultz, I. Smith.  Measurers K. Chambers, T. de Boer, J. Fairlamb, H.
        Gao, M. Huber, C.-C. Lin, E. Magnier, Y. Ramanjooloo, R. Wainscoat, R.
        Weryk.  1.8-m Ritchey-Chretien + CCD.
    F52 Pan-STARRS 2, Haleakala.  Observers J. Herman, T. Lowe, P. Minguez, A.
        Schultz, I. Smith.  Measurers K. Chambers, T. de Boer, J. Fairlamb, H.
        Gao, M. Huber, C.-C. Lin, E. Magnier, Y. Ramanjooloo, R. Wainscoat, R.
        Weryk.  1.8-m Ritchey-Chretien + CCD.
    G96 Mt. Lemmon Survey.  Observer A. R. Gibbs.  Measurers E. C. Beshore, D.
        Fay, J. B. Fazekas, D. C. Fuls, A. R. Gibbs, A. D. Grauer, H. Groeller, J.
        K. Hogan, R. A. Kowalski, S. M. Larson, G. J. Leonard, D. Rankin, R. L.
        Seaman, F. C. Shelly, K. W. Wierzchos.  1.5-m reflector + 10K CCD.
    H01 Magdalena Ridge Observatory, Socorro.  Observers W. H. Ryan, E. V. Ryan.
        Measurer W. H. Ryan.  2.4-m f/8.9 Ritchey-Chretien + CCD.
    T12 University of Hawaii 88-inch telescope, Maunakea.  Observer D. J. Tholen.
        2.24-m f/10.1 reflector + 2112 x 2112 pixels STA1600 10k CCD.
    
    First and last observations above in comparison with prediction:
    Residuals in seconds of arc (or two decimals in degrees), reference and Delta-T
    230726 F52 0.37- 0.15-    231217 H01 0.31- 0.23-    E2023-R13   -0.12 days
    
    Orbital elements:
    2017 AL4                                                 Earth MOID = 0.0880 AU
    Epoch 2023 Sept. 13.0 TT = JDT 2460200.5                Veres                   
    M 336.46356              (2000.0)            P               Q                  
    n   0.56296843     Peri.  127.94144     +0.75939595     -0.60915674             
    a   1.4526022      Node   270.77272     +0.50185686     +0.77199910             
    e   0.3114057      Incl.   13.21433     +0.41407424     +0.18150881             
    P   1.75           H   23.09          G   0.15           U   0                  
    Residuals in seconds of arc
    170103 F51  0.3+  0.1+    170202 T12  0.0   0.0     231215 F52  0.1+  0.1+
    170103 F51  0.0   0.3+    170202 T12  0.0   0.0     231215 F52  0.2-  0.0
    170103 F51  0.0   0.2+    170206 705  0.2+  0.0     231216 T12  0.1+  0.0
    170103 F51  0.1+  0.1-    170206 705  0.6+  0.2+    231216 T12  0.2+  0.0
    170104 568  0.0   0.0     170206 705  0.1+  0.3-    231216 T12  0.2+  0.0
    170104 568  0.0   0.0     230726 F52  0.1-  0.1-    231216 T12  0.1+  0.0
    170104 568  0.0   0.0     230726 F52  0.2-  0.2+    231217 G96  0.4-  0.2-
    170106 807  0.2+  0.4+    230726 F52  0.1+  0.1-    231217 G96  0.2+  0.1+
    170106 807  0.4-  0.0     231031 F51  0.1+  0.2-    231217 G96  0.3+  0.2+
    170106 807  0.0   0.2+    231031 F51  0.2-  0.4+    231217 G96  0.5-  0.6-
    170108 H21  0.2-  0.3-    231124 F51  0.1-  0.1-    231217 H01  0.0   0.0
    170108 H21  0.1-  0.7-    231124 F51  0.2-  0.3+    231217 H01  0.1+  0.0
    170108 H21  0.3-  0.9-    231124 F51  0.0   0.0     231217 H01  0.1+  0.0
    170108 H21  0.1-  0.5-    231124 F51  0.1+  0.1-    231217 H01  0.0   0.1-
    
    Ephemeris:
    2017 AL4                 a,e,i = 1.45, 0.31, 13                  q = 1.0003
    Date    TT    R. A. (2000) Decl.     Delta      r    Elong.  Phase     V
    2023 11 17    10 17 49.5 +40 46 23   0.2212  1.0244    93.0    74.6    22.5
    ...
    2023 12 02    10 02 09.5 +24 51 15   0.2173  1.0631   105.0    63.6    22.2
    ...
    2023 12 10    09 50 14.4 +16 37 51   0.2187  1.0897   113.2    56.2    22.0
    ...
    2023 12 16    09 39 04.5 +10 48 47   0.2221  1.1118   119.9    50.1    21.9
    2023 12 17    09 37 01.5 +09 53 07   0.2229  1.1156   121.1    49.1    21.9
    2023 12 18    09 34 55.3 +08 58 17   0.2238  1.1195   122.2    48.0    21.9
    ...
    2023 12 24    09 21 17.5 +03 49 38   0.2309  1.1436   129.2    41.8    21.8
    ...
    2024 01 01    09 01 01.4 -01 55 13   0.2459  1.1775   138.0    34.0    21.8
    ...
    2024 01 16    08 22 06.0 -08 29 37   0.2936  1.2450   149.2    23.9    22.0
    
    A. U. Tomatic                (C) Copyright 2023 MPC           M.P.E.C. 2023-Y21
    


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