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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 111 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2221724647141526 2.9564e-08  
a 2.358703048754324 5.1342e-09 au
q 1.83466417888379 6.938e-08 au
i 8.055901461683233 3.4095e-06 deg
node 233.7018932547546 2.4607e-05 deg
peri 57.96529831368209 2.5803e-05 deg
M 21.0750129960062 8.1625e-06 deg
tp 2458923.040680049915
(2020-Mar-14.54068005)
2.9928e-05 TDB
period 1323.147709911968
3.62
4.3202e-06
1.183e-08
d
yr
n .2720784666013982 8.8835e-10 deg/d
Q 2.882741918624858 6.2749e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3222  
   data-arc span      46465 days (127.21 yr)  
   first obs. used      1893-08-08  
   last obs. used      2020-10-26  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41793  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:31:20  

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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