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284 Amalia (A889 KA)
Classification: Main-belt Asteroid          SPK-ID: 2000284
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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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 109 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2221724527113322 3.2873e-08  
a 2.358703050575911 5.6512e-09 au
q 1.834664208611759 7.8046e-08 au
i 8.055899174740569 3.6111e-06 deg
node 233.7018770423547 2.595e-05 deg
peri 57.96531455549325 2.7024e-05 deg
M 21.07501116432047 8.5887e-06 deg
tp 2458923.040686692381
(2020-Mar-14.54068669)
3.1462e-05 TDB
period 1323.147711444735
3.62
4.7552e-06
1.302e-08
d
yr
n .2720784662862158 9.7781e-10 deg/d
Q 2.882741892540063 6.9067e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2945  
   data-arc span      46382 days (126.99 yr)  
   first obs. used      1893-08-08  
   last obs. used      2020-08-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43336  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:13:48  

Additional Information
 Earth MOID = .833631 au 
 Jupiter MOID = 2.32827 au 
 T_jup = 3.506 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 10.1   n/a MPO473764 IRAS observations used: 20
magnitude slope G 0.11   n/a PDS3 (MPC 17258) Fit
diameter diameter 52.95 km 2.6 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 20
rotation period rot_per 8.545 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Harris, A.W.; Young, J.W. (1989) Icarus 81, 314-364.]
[Behrend, R. (2004) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2006) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.0602   0.006 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 20
B-V BV 0.698   0.017 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=5; phase (min.=5.27, mean=10.83, max.=21.41) deg.
U-B UB 0.380   0.052 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=5; phase (min.=5.27, mean=10.83, max.=21.41) deg.
Tholen spectral type spec_T CX   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices
SMASSII spectral type spec_B Ch   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

284 Amalia (A889 KA)          Discovered 1889-May-29 by Charlois, A. at Nice
Reference: DISCOVERY.DBLast Updated: 2003-08-29
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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