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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.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 111 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2202808135719321 3.3889e-08  
a 2.762811974182417 4.225e-09 au
q 2.154217504763238 9.3212e-08 au
i 2.82647313160241 2.9515e-06 deg
node 25.44437279777465 7.8665e-05 deg
peri 111.1670751618484 7.8928e-05 deg
M 261.5988252268187 7.7222e-06 deg
tp 2459458.982964785732
(2021-Sep-01.48296479)
3.654e-05 TDB
period 1677.356674890512
4.59
3.8476e-06
1.053e-08
d
yr
n .2146234044250002 4.9231e-10 deg/d
Q 3.371406443601596 5.1556e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3264  
   data-arc span      56942 days (155.90 yr)  
   first obs. used      1864-12-05  
   last obs. used      2020-10-30  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47647  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:33:33  

Additional Information
 Earth MOID = 1.16989 au 
 Jupiter MOID = 1.67133 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 8.2   n/a MPO502153 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. 2019-August); 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

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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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