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2920 Automedon (1981 JR)
Classification: Jupiter Trojan          SPK-ID: 2002920
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .02698405544388278 4.98e-08  
a 5.109183707569843 7.2303e-08 au
q 4.971317211131796 2.9803e-07 au
i 21.11984213705006 4.3357e-06 deg
node 230.9421401099561 1.283e-05 deg
peri 196.7386002187904 9.3664e-05 deg
M 290.3916932570749 9.4508e-05 deg
tp 2459816.113251872965
(2022-Aug-24.61325187)
0.0011107 TDB
period 4218.185794385964
11.55
8.9541e-05
2.451e-07
d
yr
n .08534474713729502 1.8116e-09 deg/d
Q 5.24705020400789 7.4254e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2732  
   data-arc span      14426 days (39.50 yr)  
   first obs. used      1981-05-03  
   last obs. used      2020-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .40692  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:04:48  

Additional Information
 Earth MOID = 3.98657 au 
 Jupiter MOID = .0354407 au 
 T_jup = 2.866 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 8.7   n/a MPO502181  
diameter diameter 88.574 km 1.796 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  
rotation period rot_per 10.212 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Molnar, L.A.; Haegert, M.J.; Hoogenboom, K.M. (2008) Minor Planet Bull. 35, 82-84.]
[Mottola, S.; Di Martino, M.; Erikson, A.; Gonano-Beurer, M.; et al. (2011) Astron. J. 141, A170.]
[Stephens, R.D. Warner, B.D. (2017) Minor Planet Bull. 44, 312-316.]
[Stephens, R.D.; Warner, B.D. (2019) Minor Planet Bull. 46, 73-75.]
geometric albedo albedo 0.068   0.009 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  

2920 Automedon (1981 JR)          Discovered 1981-May-03 by Bowell, E. at Flagstaff (AM)
Discovered at the Anderson Mesa station, which is operated by the Lowell Observatory.
Reference: DISCOVERY.DBLast Updated: 2003-08-29
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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