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3258 Somnium (1983 RJ)
Classification: Main-belt Asteroid          SPK-ID: 2003258
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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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 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1960018109555858 3.726e-08  
a 2.206254514893297 5.6602e-09 au
q 1.773824634545274 8.2895e-08 au
i 7.551977179117835 4.5431e-06 deg
node 45.00472716109662 2.4977e-05 deg
peri 296.9218956460948 2.6799e-05 deg
M 81.91785463151957 8.8775e-06 deg
tp 2458728.130851408554
(2019-Sep-01.63085141)
2.9583e-05 TDB
period 1196.966081863095
3.28
4.6063e-06
1.261e-08
d
yr
n .3007604020321568 1.1574e-09 deg/d
Q 2.638684395241321 6.7696e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2305  
   data-arc span      14894 days (40.78 yr)  
   first obs. used      1979-04-25  
   last obs. used      2020-02-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43556  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 16:42:28  

Additional Information
 Earth MOID = .781942 au 
 Jupiter MOID = 2.79067 au 
 T_jup = 3.624 
[ 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 13.2   n/a MPO439096  
rotation period rot_per 5.3379 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Oey, J.; Vilagi, J.; Gajdos, S.; Kornos, L.; Galad, A. (2007) Minor Planet Bull. 34, 81-83.]
[Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.]
SMASSII spectral type spec_B S   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)

3258 Somnium (1983 RJ)          Discovered 1983-Sep-08 by Wild, P. at Zimmerwald
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1983 RJ = 1979 HF3 = 1980 YG 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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