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881 Athene (A917 OD)
Classification: Main-belt Asteroid          SPK-ID: 2000881
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 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .205568443380066 3.6621e-08  
a 2.613698715514698 9.0525e-09 au
q 2.076404739101863 9.4784e-08 au
i 14.19107765770606 4.5341e-06 deg
node 277.0333528360434 1.61e-05 deg
peri 41.31311732371238 1.9734e-05 deg
M 121.3025051449488 1.2666e-05 deg
tp 2458480.445351357446
(2018-Dec-27.94535136)
5.3379e-05 TDB
period 1543.411434805934
4.23
8.0184e-06
2.195e-08
d
yr
n .233249535335512 1.2118e-09 deg/d
Q 3.150992691927532 1.0913e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2393  
   data-arc span      37536 days (102.77 yr)  
   first obs. used      1917-07-22  
   last obs. used      2020-04-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42774  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 01:14:29  

Additional Information
 Earth MOID = 1.08307 au 
 Jupiter MOID = 2.17845 au 
 T_jup = 3.336 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456368.5 (2013-Mar-17.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2072388518852342 3.657e-08  
q 2.070436419709654 9.4755e-08 au
tp 2456938.490752043507
(2014-Oct-07.99075204)
5.0858e-05 TDB
node 277.1450105399896 1.612e-05 deg
peri 41.40516606298596 1.969e-05 deg
i 14.18807670874627 4.5324e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2393  
   data-arc span      37536 days (102.77 yr)  
   first obs. used      1917-07-22  
   last obs. used      2020-04-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42774  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 01:14:29  

Additional Information
 Jupiter MOID = 2.17845 au 
 T_jup = 3.336 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.337365794245325E-15 -3.455552007678946E-15 1.191580612813061E-13 -1.061722472286511E-15 -2.75382219000267E-14 3.103538586310318E-16
q -3.455552007678946E-15 8.978446844638065E-15 -2.518656390053283E-13 2.690271543760881E-15 7.844620076126309E-14 -4.035285796444165E-16
tp 1.191580612813061E-13 -2.518656390053283E-13 2.586576743395391E-9 -8.36235305946965E-12 5.855577295802441E-10 -3.071634666589543E-12
node -1.061722472286511E-15 2.690271543760881E-15 -8.36235305946965E-12 2.598649847672501E-10 -2.532064763536488E-10 -1.300828235755106E-11
peri -2.75382219000267E-14 7.844620076126309E-14 5.855577295802441E-10 -2.532064763536488E-10 3.876819877163657E-10 1.183055688935771E-11
i 3.103538586310318E-16 -4.035285796444165E-16 -3.071634666589543E-12 -1.300828235755106E-11 1.183055688935771E-11 2.054273952635087E-11

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 11.8   n/a MPO439070  
diameter diameter 12.153 km 0.101 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 13.895 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Behrend, R. (2006) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2010) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Durech, J.; Hanus, J.; Oszkiewsicz, D.; Vanco, R. (2016) Astron. Astrophys. 587, A48.]
[Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.]
geometric albedo albedo 0.237   0.039 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

881 Athene (A917 OD)          Discovered 1917-Jul-22 by Wolf, M. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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