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103 Hera (A868 RA)
Classification: Main-belt Asteroid          SPK-ID: 2000103
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.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 116 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07922951093182569 3.5424e-08  
a 2.702717682317449 7.114e-09 au
q 2.48858268216064 9.5341e-08 au
i 5.418467247542871 3.9944e-06 deg
node 136.0771220161525 4.0372e-05 deg
peri 188.8406349403369 4.7511e-05 deg
M 127.9077572259329 2.5937e-05 deg
tp 2458623.874512839306
(2019-May-20.37451284)
0.00011653 TDB
period 1622.928740836077
4.44
6.4077e-06
1.754e-08
d
yr
n .2218211995029064 8.758e-10 deg/d
Q 2.916852682474258 7.6776e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2779  
   data-arc span      54704 days (149.77 yr)  
   first obs. used      1871-04-04  
   last obs. used      2021-01-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50076  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 00:43:26  

Additional Information
 Earth MOID = 1.47452 au 
 Jupiter MOID = 2.3312 au 
 T_jup = 3.356 
[ 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 7.63   n/a E2021B10 IRAS observations used: 25
diameter diameter 83.908 km 2.091 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 23.740 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Harris, A.W.; Young, J.W. (1983) Icarus 54, 59-109.]
[Pilcher, F.; Higgins, D. (2011) Minor Planet Bull. 38, 32.]
[Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.]
geometric albedo albedo 0.217   0.024 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
B-V BV 0.853   0.012 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=7; phase (min.=3.66, mean=7.54, max.=19.73) deg.
U-B UB 0.441   0.015 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=8; phase (min.=3.66, mean=9.26, max.=21.25) deg.
Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo
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)

103 Hera (A868 RA)          Discovered 1868-Sep-07 by Watson, J. C. at Ann Arbor
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 A868 RA = 1927 CV = 1950 CM 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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