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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.


Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 47 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2358214821682555 1.547e-08  
a 2.964859647293908 8.8827e-09 au
q 2.265682050848208 4.7127e-08 au
i 6.177063919785335 7.9776e-07 deg
node 180.6252899316792 2.129e-06 deg
peri 209.9026715005771 5.2581e-06 deg
M 220.3598354361449 7.5619e-06 deg
tp 2460119.790043634343
(2023-Jun-24.29004363)
4.1391e-05 TDB
period 1864.681386774606
5.11
8.3799e-06
2.294e-08
d
yr
n .1930624730601846 8.6762e-10 deg/d
Q 3.664037243739609 1.0977e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3621  
   data-arc span      50026 days (136.96 yr)  
   first obs. used      1884-08-20  
   last obs. used      2021-08-08  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .42065  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 06:23:17  

Additional Information
 Earth MOID = 1.27265 au 
 Jupiter MOID = 1.79238 au 
 T_jup = 3.214 
[ 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 10.51   n/a E2021B10  
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. 2020-October); 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.]
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
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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