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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 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0653855747391059 3.5738e-08  
a 2.174718875066584 5.6006e-09 au
q 2.032523631524374 7.8123e-08 au
i .9392731123989501 4.0901e-06 deg
node 159.6152626128182 0.0002392 deg
peri 250.6086564250625 0.00024073 deg
M 280.6859882222799 2.8887e-05 deg
tp 2457858.577729563953
(2017-Apr-15.07772956)
9.4013e-05 JED
period 1171.394316850353
3.21
4.5251e-06
1.239e-08
d
yr
n .3073260599112079 1.1872e-09 deg/d
Q 2.316914118608795 5.9668e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1741  
   data-arc span      45493 days (124.55 yr)  
   first obs. used      1891-09-28  
   last obs. used      2016-04-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .53536  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Apr-25 12:25:44  

Additional Information
 Earth MOID = 1.04123 au 
 Jupiter MOID = 2.87692 au 
 T_jup = 3.683 
[ 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. 2016-February); 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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