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516 Amherstia (A903 SG)
Classification: Main-belt Asteroid          SPK-ID: 2000516
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 85 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2718870099379869 4.2317e-08  
a 2.680938166909607 7.4609e-09 au
q 1.952025904879926 1.1432e-07 au
i 12.95920011166311 4.2181e-06 deg
node 328.8015536705859 2.0057e-05 deg
peri 258.1911111052074 2.155e-05 deg
M 340.3112813501035 1.0465e-05 deg
tp 2459088.188688646551
(2020-Aug-26.68868865)
4.6728e-05 TDB
period 1603.351059766616
4.39
6.6931e-06
1.832e-08
d
yr
n .2245297421342033 9.3728e-10 deg/d
Q 3.409850428939288 9.4895e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2588  
   data-arc span      42630 days (116.71 yr)  
   first obs. used      1903-11-14  
   last obs. used      2020-08-01  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4492  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:17:17  

Additional Information
 Earth MOID = .992334 au 
 Jupiter MOID = 1.83989 au 
 T_jup = 3.287 
[ 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 8.2   n/a MPO502158 IRAS observations used: 8
diameter diameter 65.144 km 0.380 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 7.4842 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Lagerkvist, C.-I.; Hahn, G.; Magnusson, P.; Rickman, H. (1987) Astron. Astrophys. Suppl. Ser. 70, 21-32.]
[Michalowski, T.; Pych, W.; Berthier, J.; Kryszczynska, A.; et al. (2000) Astron. Astrophys. Suppl. Ser. 146, 471-479.]
[Behrend, R. (2008) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Durech, J.; Kaasalainen, M.; Warner, B.D.; Fauerbach, M.; et al. (2009) Astron. Astrophys. 493, 291-297.]
[Hanus, J.; Durech, J.; Broz, M.; Warner, B.D.; et al. (2011) Astron. Astrophys. 530, A134.]
[Behrend, R. (2017) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.202   0.015 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
B-V BV 0.736   0.018 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=7; phase (min.=3.91, mean=10.61, max.=27.13) deg.
U-B UB 0.265   0.045 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=6; phase (min.=3.91, mean=11.35, max.=27.13) deg.
Tholen spectral type spec_T M   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices; used ground-based radiometric albedo
SMASSII spectral type spec_B X   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)

516 Amherstia (A903 SG)          Discovered 1903-Sep-20 by Dugan, R. S. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 A903 SG = 1938 YO 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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