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JPL Small-Body Database Browser
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3655 Eupraksia (1978 SA3)
Classification: Outer Main-belt Asteroid          SPK-ID: 2003655
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 .2014920685950667 4.6649e-08  
a 4.019320855328332 3.4017e-08 au
q 3.209459581840933 1.9323e-07 au
i 3.821500531245616 5.1379e-06 deg
node 338.0198196885114 6.7099e-05 deg
peri 39.52019456818012 6.7855e-05 deg
M 66.60257294780844 9.8286e-06 deg
tp 2458455.977352023600
(2018-Dec-03.47735202)
7.9515e-05 TDB
period 2943.25195852594
8.06
3.7365e-05
1.023e-07
d
yr
n .1223136874018416 1.5528e-09 deg/d
Q 4.829182128815731 4.0871e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1973  
   data-arc span      23995 days (65.69 yr)  
   first obs. used      1954-08-04  
   last obs. used      2020-04-14  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46293  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 01:57:01  

Additional Information
 Earth MOID = 2.21254 au 
 Jupiter MOID = .709521 au 
 T_jup = 3.012 
[ 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 11.0   n/a MPO452215  
diameter diameter 36.657 km 0.269 urn:nasa:pds:neowise_diameters_albedos::2.0[hildas] (http://adsabs.harvard.edu/abs/2012ApJ...744..197G)  
rotation period rot_per 75.668 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.063   0.013 urn:nasa:pds:neowise_diameters_albedos::2.0[hildas] (http://adsabs.harvard.edu/abs/2012ApJ...744..197G)  

3655 Eupraksia (1978 SA3)          Discovered 1978-Sep-26 by Zhuravleva, L. at Nauchnyj
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 1978 SA3 = 1979 YW2 = 1981 ED49 = 1982 FZ3 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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