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82 Alkmene (A864 WA)
Classification: Main-belt Asteroid          SPK-ID: 2000082
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 118 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2203304475470879 1.6053e-08  
a 2.763405256845337 3.8624e-09 au
q 2.154542939850628 4.5501e-08 au
i 2.826257312465931 8.5641e-07 deg
node 25.44361545707056 6.2343e-06 deg
peri 111.1168888991231 7.2281e-06 deg
M 304.574798777464 6.2789e-06 deg
tp 2459458.827162563151
(2021-Sep-01.32716256)
2.9628e-05 TDB
period 1677.896993992712
4.59
3.5178e-06
9.631e-09
d
yr
n .2145542910493847 4.4983e-10 deg/d
Q 3.372267573840045 4.7135e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3492  
   data-arc span      57086 days (156.29 yr)  
   first obs. used      1864-12-05  
   last obs. used      2021-03-23  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46735  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 17:49:54  

Additional Information
 Earth MOID = 1.17013 au 
 Jupiter MOID = 1.67005 au 
 T_jup = 3.303 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 8.28   n/a E2021B10 IRAS observations used: 12
magnitude slope G 0.28   n/a PDS3 (MPC 17257) Fit
diameter diameter 57.621 km 0.714 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 12.999 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Harris, A.W.; Young, J.; Scaltriti, F.; Zappala, V. (1984) Icarus 57, 251-258.]
[Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2006) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Durech, J. (2006) IAU 2006, poster paper.]
[Durech, J.; Kaasalainen, M.; Warner, B.D.; Fauerbach, M.; et al. (2009) Astron. Astrophys. 493, 291-297.]
[Hanus, J.; Durech, J.; Broz, M.; Warner, B.D.; et al. (2011) Astron. Astrophys. 530, A134.]
geometric albedo albedo 0.167   0.024 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
B-V BV 0.814   0.014 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=5; phase (min.=8.57, mean=15.80, max.=23.77) deg.
U-B UB 0.380   0.029 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=5; phase (min.=8.57, mean=15.80, max.=23.77) deg.
Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo
SMASSII spectral type spec_B Sq   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

82 Alkmene (A864 WA)          Discovered 1864-Nov-27 by Luther, R. at Dusseldorf
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1950-Nov-19 13:16 < 00:01 Jupiter 1.69770506353046 1.69770488932071 1.69770523774243 1.24991635395219 0.751296724125846 2433605.052498545 0.382664040128224 228.691525165745 45.9651075813138 41.6044453913793 9785085.05587447 T 118 CATAB v2.0g-lin.ifort 2021-May-03 17:51:10 2021-May-03 17:51
1973-Feb-26 23:44 < 00:01 Jupiter 1.86368386246887 1.86368361726467 1.86368410767319 1.36320940472457 0.974352749437531 2441740.488967877 0.245693545236881 98.6841687594846 16.7771744751926 31.2599596001813 10158299.8473428 T 118 CATAB v2.0g-lin.ifort 2021-May-03 17:51:10 2021-May-03 17:51
2010-Dec-08 02:09 < 00:01 Jupiter 1.87468739525858 1.87468726136004 1.87468752915713 1.99833625811497 1.75775608791145 2455538.589745044 0.0426227777372535 14.7640411494671 7.57779181741668 79.9334087342831 6826670.11155893 T 118 CATAB v2.0g-lin.ifort 2021-May-03 17:51:10 2021-May-03 17:51
2033-Mar-15 04:04 < 00:01 Jupiter 1.69063646210626 1.69063634161898 1.69063658261237 1.04056725687826 0.284190210732341 2463671.669184216 0.14940568606591 2764.32375707899 132.768153802498 16.1848334263942 24798756.0404982 T 118 CATAB v2.0g-lin.ifort 2021-May-03 17:51:10 2021-May-03 17:51
2093-Mar-27 13:42 < 00:01 Jupiter 1.68601579880197 1.68601562562236 1.68601597198646 1.22167380077209 0.698372843561794 2485599.070518809 0.520408708993899 324.73442730517 52.4874192169585 40.4753043543463 10801272.9473922 T 118 CATAB v2.0g-lin.ifort 2021-May-03 17:51:10 2021-May-03 17:51
2115-Jul-06 16:48 < 00:01 Jupiter 1.89268126227881 1.89268086393758 1.89268166062015 1.47559403405054 1.13239896036205 2493734.199981471 0.685777004047381 67.7260617140424 17.6056717410835 44.5988156841272 8777452.68581539 T 118 CATAB v2.0g-lin.ifort 2021-May-03 17:51:10 2021-May-03 17:51
2153-Apr-20 09:21 < 00:01 Jupiter 1.85555680088378 1.85555627295176 1.85555732881549 1.90913458535784 1.65282699714686 2507536.889840835 0.920955356990345 31.90252423761 10.7092784583264 52.4901882291936 3301516.88542294 T 118 CATAB v2.0g-lin.ifort 2021-May-03 17:51:10 2021-May-03 17:51
2175-Jul-29 00:20 00:01 Jupiter 1.69915696639457 1.69915667047496 1.69915726233032 1.08121140860636 0.414760928719879 2515671.514224207 1.03275494968923 975.817560919466 269.755164761275 33.46847733849 9688167.47521416 T 118 CATAB v2.0g-lin.ifort 2021-May-03 17:51:10 2021-May-03 17:51

Alternate Designations
 A864 WA = 1952 BB = 1963 OA = 1973 GO 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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