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3838 Epona (1986 WA)
Classification: Apollo [NEO]          SPK-ID: 2003838
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.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 120 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .7024587246135878 8.2579e-08  
a 1.505036467634238 5.4469e-09 au
q .4478104700829519 1.2472e-07 au
i 29.20289835155993 9.654e-06 deg
node 235.4947724187411 1.0667e-05 deg
peri 49.70768561043524 1.1077e-05 deg
M 198.3603574543672 1.3021e-05 deg
tp 2459503.305906520587
(2021-Oct-15.80590652)
2.5742e-05 TDB
period 674.4021740621976
1.85
3.6611e-06
1.002e-08
d
yr
n .5338061083516 2.8978e-09 deg/d
Q 2.562262465185525 9.2731e-09 au
  Orbit Determination Parameters
   # obs. used (total)      705  
   data-arc span      12532 days (34.31 yr)  
   first obs. used      1986-11-30  
   last obs. used      2021-03-23  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .50491  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 15:37:10  

Additional Information
 Earth MOID = .159472 au 
 Jupiter MOID = 2.88706 au 
 T_jup = 4.126 
[ 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 15.58   n/a E2021B10  
rotation period rot_per 2.3812 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Pravec, P.; Wolf, M.; Sarounova, L. (1999) http://www.asu.cas.cz/~ppravec/neo.htm]
[Skiff, B.A. (2011) Posting on CALL web site. http://www.minorplanet.info/call.html]
[Skiff, B.A.; McLelland, K.P.; Sanborn, J.; Pravec, P.; Koehn, B.W. (2019). Minor Planet Bull. 46, 458-503.]

3838 Epona (1986 WA)          Discovered 1986-Nov-27 by Maury, A. at Palomar
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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