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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 52 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06517560160433847 8.2763e-09  
a 2.174822557448544 4.2024e-09 au
q 2.03307718888415 1.9235e-08 au
i .9396277526670879 6.6541e-07 deg
node 159.5934406048662 2.8599e-05 deg
peri 251.2980198353946 3.2308e-05 deg
M 111.9127337670142 1.6226e-05 deg
tp 2459032.324123540280
(2020-Jul-01.82412354)
5.256e-05 TDB
period 1171.478089333756
3.21
3.3955e-06
9.296e-09
d
yr
n .3073040830023031 8.907e-10 deg/d
Q 2.31656792601294 4.4763e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3695  
   data-arc span      47370 days (129.69 yr)  
   first obs. used      1891-09-28  
   last obs. used      2021-06-08  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .42396  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 10:35:44  

Additional Information
 Earth MOID = 1.04298 au 
 Jupiter MOID = 2.86864 au 
 T_jup = 3.683 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456662.5 (2014-Jan-05.0) TDB
Reference: JPL 52 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06479140943692727 8.3238e-09  
q 2.033614913537297 1.9319e-08 au
tp 2456688.373554544469
(2014-Jan-30.87355454)
5.1565e-05 TDB
node 159.6409398741961 2.865e-05 deg
peri 250.9697424854517 3.2361e-05 deg
i .9384214284910813 6.652e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      3695  
   data-arc span      47370 days (129.69 yr)  
   first obs. used      1891-09-28  
   last obs. used      2021-06-08  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .42396  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 10:35:44  

Additional Information
 Jupiter MOID = 2.86864 au 
 T_jup = 3.683 
Orbit Covariance (6×6)
  e q tp node peri i
e 6.928542998101527E-17 -1.576197643845172E-16 -1.411856883714892E-13 6.337261094954053E-14 -1.073583362442296E-13 6.777886389097552E-16
q -1.576197643845172E-16 3.732306587815661E-16 3.253896995886996E-13 -1.374119658372E-13 2.40103154535038E-13 -1.410898870281104E-15
tp -1.411856883714892E-13 3.253896995886996E-13 2.658995196925433E-9 -8.145144479947879E-12 7.779283983839276E-10 3.850172859794662E-14
node 6.337261094954053E-14 -1.374119658372E-13 -8.145144479947879E-12 8.208183343828979E-10 -8.222786681645236E-10 2.30238330517149E-12
peri -1.073583362442296E-13 2.40103154535038E-13 7.779283983839276E-10 -8.222786681645236E-10 1.047235383003716E-9 -2.372684774736477E-12
i 6.777886389097552E-16 -1.410898870281104E-15 3.850172859794662E-14 2.30238330517149E-12 -2.372684774736477E-12 4.424846186287455E-13

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 10.57   n/a MPCxxxxx  
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. 2020-October); 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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