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JPL Small-Body Database Browser
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971 Alsatia (A921 WH)
Classification: Main-belt Asteroid          SPK-ID: 2000971
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 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1625856710433724 3.5486e-08  
a 2.639826063134211 9.4795e-09 au
q 2.210628171221751 9.288e-08 au
i 13.79240127951316 4.0034e-06 deg
node 83.49477284928803 1.8377e-05 deg
peri 6.572363058381259 2.2795e-05 deg
M 315.8853797334428 1.4739e-05 deg
tp 2459192.473569392262
6.4602e-05 TDB
period 1566.61180723358
n .2297952807056333 1.2378e-09 deg/d
Q 3.069023955046671 1.1021e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2375  
   data-arc span      40580 days (111.10 yr)  
   first obs. used      1908-10-29  
   last obs. used      2019-12-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42309  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-13 20:51:31  

Additional Information
 Earth MOID = 1.22757 au 
 Jupiter MOID = 2.16204 au 
 T_jup = 3.336 
[ 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 MPO502162 IRAS observations used: 11
diameter diameter 60.867 km 0.527 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 9.614 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Behrend, R. (2005) Observatoire de Geneve web site,]
[Melton, E.; Carver, S.; Harris, A.; Karnemaat, R.; et al. (2012) Minor Planet Bull. 39, 131-133.]
[Warner, B.D (2012) Minor Planet Bull. 39, 69-80.]
[Klinglesmith III, D.A.; Hendrickx, S.; Kimber, C.; Madden, K. (2017) Minor Planet Bull. 44, 244-246.]
geometric albedo albedo 0.046   0.005 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
B-V BV 0.669   0.020 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=4.04 deg.
U-B UB 0.298   0.030 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=4.04 deg.
SMASSII spectral type spec_B C   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)

971 Alsatia (A921 WH)          Discovered 1921-Nov-23 by Schaumasse, A. at Nice
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 A921 WH = 1961 AA = A908 UE 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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