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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 11 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2340262376533667 3.6111e-08  
a 2.968483586306722 1.2012e-08 AU
q 2.273780541067587 1.087e-07 AU
i 6.171164498003728 5.1546e-06 deg
node 180.6310600955899 4.2643e-05 deg
peri 210.3096410765992 4.4332e-05 deg
M 117.6967028274454 1.1454e-05 deg
tp 2456389.751793096587
(2013-Apr-07.25179310)
5.8231e-05 JED
period 1868.101222916825
5.11
1.1339e-05
3.104e-08
d
yr
n .192709043591279 1.1697e-09 deg/d
Q 3.663186631545857 1.4823e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1522  
   data-arc span      47606 days (130.34 yr)  
   first obs. used      1884-08-20  
   last obs. used      2014-12-23  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .54229  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Jan-07 23:44:00  

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 Asteroid Lightcurve DataBase (Rev. 2014-Mar-01) 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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