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871 Amneris (A917 JD)
Classification: Main-belt Asteroid          SPK-ID: 2000871
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.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 43 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .120325248852791 1.522e-08  
a 2.222178508587341 4.473e-09 au
q 1.954794326546246 3.5383e-08 au
i 4.25247112054261 6.5014e-07 deg
node 157.9885152283751 2.873e-06 deg
peri 66.51668519460357 7.7609e-06 deg
M 96.17401551852623 8.7582e-06 deg
tp 2458877.262238820769
(2020-Jan-28.76223882)
2.9072e-05 TDB
period 1209.948377398335
3.31
3.6532e-06
1e-08
d
yr
n .2975333549139363 8.9834e-10 deg/d
Q 2.489562690628437 5.0112e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3160  
   data-arc span      41516 days (113.66 yr)  
   first obs. used      1907-05-09  
   last obs. used      2021-01-06  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .44593  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 11:33:52  

Additional Information
 Earth MOID = .949471 au 
 Jupiter MOID = 2.48789 au 
 T_jup = 3.635 
[ 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 12.62   n/a E2021B10  
diameter diameter 8.011 km 0.063 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 78.704 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Pilcher, F.; Benishek, V.; Oey, J. (2016) Minor Planet Bull. 43, 264-265.]
geometric albedo albedo 0.380   0.020 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

871 Amneris (A917 JD)          Discovered 1917-May-14 by Wolf, M. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 A917 JD = 1930 DD = 1953 EZ = A907 JA 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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