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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 14 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2340262397700541 3.5945e-08  
a 2.968483591402728 1.1722e-08 AU
q 2.273780538687642 1.0809e-07 AU
i 6.171164197599353 5.1215e-06 deg
node 180.6310817088351 4.025e-05 deg
peri 210.3096173179918 4.1879e-05 deg
M 117.6967035401615 1.1171e-05 deg
tp 2456389.751787825471
(2013-Apr-07.25178783)
5.665e-05 JED
period 1868.101227727289
5.11
1.1066e-05
3.03e-08
d
yr
n .1927090430950425 1.1415e-09 deg/d
Q 3.663186644117814 1.4466e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1617  
   data-arc span      47703 days (130.60 yr)  
   first obs. used      1884-08-20  
   last obs. used      2015-03-30  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .54452  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Apr-07 15:59:04  

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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