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149 Medusa (A875 SA)
Classification: Main-belt Asteroid          SPK-ID: 2000149
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.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 41 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06492265057283712 3.1026e-08  
a 2.174483562998974 5.0978e-09 au
q 2.033310326462014 6.8402e-08 au
i .9395014224503011 4.4297e-06 deg
node 159.6023706866679 0.00019746 deg
peri 251.2995903505883 0.00020057 deg
M 350.2194303862128 3.575e-05 deg
tp 2459032.319567213434
(2020-Jul-01.81956721)
0.00011633 TDB
period 1171.204198647956
3.21
4.1186e-06
1.128e-08
d
yr
n .3073759472648629 1.0809e-09 deg/d
Q 2.315656799535934 5.4287e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3014  
   data-arc span      47062 days (128.85 yr)  
   first obs. used      1891-09-28  
   last obs. used      2020-08-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43879  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:10:37  

Additional Information
 Earth MOID = 1.04375 au 
 Jupiter MOID = 2.86995 au 
 T_jup = 3.683 
[ 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 10.5   n/a MPO492750  
diameter diameter 23.719 km 0.267 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 26.023 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Harris, A.W.; Young, J.W.; Dockweiler, T.; Gibson, J.; et al. (1992) Icarus 95, 115-147.]
[Behrend, R. (2010) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Pilcher, F. (2011) Minor Planet Bull. 38, 76-78.]
[Hanus, J.; Durech, J.; Broz, M.; Marciniak, A.; et al. (2013) Astron. Astrophys. 551, A67.]
geometric albedo albedo 0.152   0.030 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
B-V BV 0.803   0.016 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=1.43, mean=1.96, max.=2.50) deg.
U-B UB 0.500   0.033 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=1.43, mean=1.96, max.=2.50) deg.
Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices

149 Medusa (A875 SA)          Discovered 1875-Sep-21 by Perrotin, J. at Toulouse
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 A875 SA = A905 BA = A906 HB 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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