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JPL Small-Body Database Browser
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284 Amalia
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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 105 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2221125571393416 3.4856e-08  
a 2.35823527582459 5.8725e-09 au
q 1.83444160837499 8.2957e-08 au
i 8.057572907158914 3.7684e-06 deg
node 233.7120222837635 2.6554e-05 deg
peri 58.0638689782285 2.7629e-05 deg
M 272.1467965518962 8.8132e-06 deg
tp 2458923.300519837596
(2020-Mar-14.80051984)		 3.2849e-05 TDB
period 1322.754123703417
3.62		 4.9409e-06
1.353e-08		 d
yr
n .2721594236970362 1.0166e-09 deg/d
Q 2.88202894327419 7.1768e-09 au
   Orbit Determination Parameters
   # obs. used (total)      2662  
   data-arc span      45931 days (125.75 yr)  
   first obs. used      1893-08-08  
   last obs. used      2019-05-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44183  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-29 19:05:41  

Additional Information
 Earth MOID = .832825 au 
 Jupiter MOID = 2.32811 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 10.05   n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 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-January); 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          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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