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239 Adrastea
Classification: Main-belt Asteroid          SPK-ID: 2000239
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 13 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2340262382334011 3.5977e-08  
a 2.968483592523919 1.1778e-08 AU
q 2.273780544107974 1.0822e-07 AU
i 6.171164634045515 5.1336e-06 deg
node 180.6310703736339 4.1443e-05 deg
peri 210.309625994569 4.3087e-05 deg
M 117.6967051037121 1.1288e-05 deg
tp 2456389.751779365923
(2013-Apr-07.25177937)
5.7324e-05 JED
period 1868.101228785657
5.11
1.1118e-05
3.044e-08
d
yr
n .1927090429858637 1.1469e-09 deg/d
Q 3.663186640939864 1.4534e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1577  
   data-arc span      47671 days (130.52 yr)  
   first obs. used      1884-08-20  
   last obs. used      2015-02-26  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .54595  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Mar-09 13:27:05  

Additional Information
 Earth MOID = 1.28136 AU 
 T_jup = 3.213 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 10.4 mag n/a MPO267706  
diameter diameter 41.52 km 1.4 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 15
rotation period rot_per 18.4707 h n/a LCDB (Rev. 2015-Feb); Warner et al., 2009 Published Reference List:
[Uzpen, B.; Kipp, S. (2003) Minor Planet Bul. 30, 59-61.]
[Behrend, R. (2007) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Carbo, L.; Green, D.; Kragh, K.; Krotz, J.; et al. (2009) Minor Planet Bul. 36, 152-157.]
[Behrend, R. (2012) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.0777   0.006 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 15

239 Adrastea          Discovered 1884-Aug-18 by Palisa, J. at Vienna
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1955 MK1 = 1956 UJ = A915 TD 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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