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149 Medusa
Classification: Main-belt Asteroid          SPK-ID: 2000149
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06526617502857518 3.691e-08  
a 2.175020735559533 6.1958e-09 AU
q 2.033065451541724 8.1256e-08 AU
i .9388974752395226 4.166e-06 deg
node 159.6132313359035 0.00025618 deg
peri 250.9752109417861 0.00025768 deg
M 95.90144497929839 3.0479e-05 deg
tp 2456688.383894356389
(2014-Jan-30.88389436)
9.9396e-05 JED
period 1171.638217296464
3.21
5.0063e-06
1.371e-08
d
yr
n .3072620837093332 1.3129e-09 deg/d
Q 2.316976019577342 6.6002e-09 AU
  Orbit Determination Parameters
   # obs. used (total)      1557  
   data-arc span      45044 days (123.32 yr)  
   first obs. used      1891-09-28  
   last obs. used      2015-01-25  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .53928  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Feb-04 12:52:16  

Additional Information
 Earth MOID = 1.04306 AU 
 T_jup = 3.682 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 10.79 mag n/a MPO267705  
diameter diameter 19.75 km 0.9 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 18
rotation period rot_per 26.023 h n/a LCDB (Rev. 2015-Feb); 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 Bul. 38, 76-78.]
geometric albedo albedo 0.2334   0.022 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 18
B-V BV .803 mag .016 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=2; phase (min.=1.43, mean=1.96, max.=2.50) deg.
U-B UB .500 mag .033 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #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          Discovered 1875-Sep-21 by Perrotin, J. at Toulouse
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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