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239 Adrastea (A884 QA)
Classification: Main-belt Asteroid          SPK-ID: 2000239
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2354000626345244 2.9715e-08  
a 2.96586006664895 9.2912e-09 au
q 2.267696421194553 8.9116e-08 au
i 6.175728759112352 3.9397e-06 deg
node 180.6187563591174 2.948e-05 deg
peri 209.9447911334511 3.059e-05 deg
M 143.8689778576186 9.739e-06 deg
tp 2458254.928893825278
(2018-May-16.42889383)
4.8734e-05 TDB
period 1865.625253058586
5.11
8.7667e-06
2.4e-08
d
yr
n .1929647979463188 9.0676e-10 deg/d
Q 3.664023712103348 1.1478e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3096  
   data-arc span      49658 days (135.96 yr)  
   first obs. used      1884-08-20  
   last obs. used      2020-08-05  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44086  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:12:31  

Additional Information
 Earth MOID = 1.27538 au 
 Jupiter MOID = 1.79017 au 
 T_jup = 3.213 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 10.4   n/a MPO431493  
diameter diameter 37.609 km 0.415 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 18.4707 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Uzpen, B.; Kipp, S. (2003) Minor Planet Bull. 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 Bull. 36, 152-157.]
[Behrend, R. (2012) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Durech, J.; Hanus, J.; Oszkiewsicz, D.; Vanco, R. (2016) Astron. Astrophys. 587, A48.]
geometric albedo albedo 0.095   0.012 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

239 Adrastea (A884 QA)          Discovered 1884-Aug-18 by Palisa, J. at Vienna
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 A884 QA = 1955 MK1 = 1956 UJ = A915 TD 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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