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342 Endymion (A892 UA)
Classification: Main-belt Asteroid          SPK-ID: 2000342
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 48 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1295856269750353 3.1095e-08  
a 2.568002435037635 7.2047e-09 au
q 2.235226229419866 7.8799e-08 au
i 7.352526597519319 3.3031e-06 deg
node 232.6667229555864 3.0523e-05 deg
peri 225.1410505615602 3.4161e-05 deg
M 310.5068358505858 1.701e-05 deg
tp 2459207.149468446317
(2020-Dec-23.64946845)
7.1363e-05 TDB
period 1503.112801923264
4.12
6.3256e-06
1.732e-08
d
yr
n .239502983102381 1.0079e-09 deg/d
Q 2.900778640655405 8.1383e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2888  
   data-arc span      46675 days (127.79 yr)  
   first obs. used      1892-10-17  
   last obs. used      2020-08-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .39893  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:14:35  

Additional Information
 Earth MOID = 1.25879 au 
 Jupiter MOID = 2.30093 au 
 T_jup = 3.408 
[ 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 10.3   n/a MPO502156 IRAS observations used: 5
diameter diameter 64.266 km 1.720 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 6.319 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Behrend, R. (2003) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2007) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.035   0.007 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
B-V BV 0.712   0.049 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=8.31, mean=8.51, max.=8.70) deg.
U-B UB 0.356   0.034 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=8.31, mean=8.51, max.=8.70) deg.
Tholen spectral type spec_T C   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices
SMASSII spectral type spec_B Ch   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)

342 Endymion (A892 UA)          Discovered 1892-Oct-17 by Wolf, M. at Heidelberg
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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