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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 43 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0649226566795445 3.0455e-08  
a 2.174483561773629 4.9761e-09 au
q 2.033310312037286 6.6971e-08 au
i .9395006293911129 4.3157e-06 deg
node 159.6023650205488 0.00019718 deg
peri 251.299588072572 0.00020017 deg
M 350.2194395235915 3.485e-05 deg
tp 2459032.319537459493
(2020-Jul-01.81953746)
0.00011339 TDB
period 1171.204197657976
3.21
4.0203e-06
1.101e-08
d
yr
n .3073759475246773 1.0551e-09 deg/d
Q 2.315656811509971 5.2992e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3176  
   data-arc span      47150 days (129.09 yr)  
   first obs. used      1891-09-28  
   last obs. used      2020-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43324  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:32:51  

Additional Information
 Earth MOID = 1.04375 au 
 Jupiter MOID = 2.86995 au 
 T_jup = 3.683 
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Orbital Elements at Epoch 2456216.5 (2012-Oct-16.0) TDB
Reference: JPL 43 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06476831185097376 3.0615e-08  
q 2.034045940175115 6.732e-08 au
tp 2456687.686632033234
(2014-Jan-30.18663203)
0.00011217 TDB
node 159.6433954804878 0.00019747 deg
peri 250.7274256035892 0.00020045 deg
i .9383682175971899 4.3142e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      3176  
   data-arc span      47150 days (129.09 yr)  
   first obs. used      1891-09-28  
   last obs. used      2020-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43324  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:32:51  

Additional Information
 Jupiter MOID = 2.86995 au 
 T_jup = 3.683 
Orbit Covariance (6×6)
  e q tp node peri i
e 9.372903554926586E-16 -2.056110288048785E-15 -7.474342518214334E-13 3.56834968037201E-15 -2.346367822228516E-13 -1.22162453214591E-16
q -2.056110288048785E-15 4.532011798849223E-15 1.67395125328568E-12 -8.075413689540917E-15 5.214257447499609E-13 2.705462443446447E-16
tp -7.474342518214334E-13 1.67395125328568E-12 1.25823583118307E-8 -5.096168937015355E-12 3.870154480540283E-9 3.971426299409602E-13
node 3.56834968037201E-15 -8.075413689540917E-15 -5.096168937015355E-12 3.899327697669739E-8 -3.898878069790927E-8 1.178118896918215E-11
peri -2.346367822228516E-13 5.214257447499609E-13 3.870154480540283E-9 -3.898878069790927E-8 4.01797057525174E-8 -1.165850569484248E-11
i -1.22162453214591E-16 2.705462443446447E-16 3.971426299409602E-13 1.178118896918215E-11 -1.165850569484248E-11 1.861203886249403E-11

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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