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30981 (1995 SJ4)
Classification: Main-belt Asteroid          SPK-ID: 2030981
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .145270935814682 5.135e-08  
a 3.13512732658117 2.2429e-08 au
q 2.679684445950541 1.6044e-07 au
i 20.16474225055117 5.0963e-06 deg
node 257.9765028762324 1.6296e-05 deg
peri 91.54624275340062 2.3707e-05 deg
M 201.5408550236988 1.7732e-05 deg
tp 2460092.974897296111
(2023-May-28.47489730)
0.00010331 TDB
period 2027.594955625006
5.55
2.1758e-05
5.957e-08
d
yr
n .177550254305614 1.9053e-09 deg/d
Q 3.590570207211798 2.5687e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1242  
   data-arc span      9310 days (25.49 yr)  
   first obs. used      1995-09-25  
   last obs. used      2021-03-22  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .48301  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-04 04:32:59  

Additional Information
 Earth MOID = 1.76796 au 
 Jupiter MOID = 1.99892 au 
 T_jup = 3.102 
[ 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 13.17   n/a MPCxxxxx  
diameter diameter 13.739 km 0.238 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 2.951 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Warner, B.D. (2013) Minor Planet Bull. 40, 71-80.]
geometric albedo albedo 0.065   0.015 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

30981 (1995 SJ4)          Discovered 1995-Sep-25 by Spahr, T. B. at Catalina Station
Reference: 20011130/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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