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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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Orbit Diagram
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Note: This Java-based orbit viewer will eventually be retired.

Note: Make sure you have Java enabled on your browser to see the applet. This applet is provided as a 3D orbit visualization tool. The applet 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. For accurate long-term ephemerides, please instead use our Horizons system.

Note: If the applet is not working, here are some notes that might help.
Orbit Viewer

Additional Notes: the orbits shown in the applet are color coded. The planets are white lines, and the asteroid/comet is a blue line. The bright white line indicates the portion of the orbit that is above the ecliptic plane, and the darker portion is below the ecliptic plane. Likewise for the asteroid/comet orbit, the light blue indicates the portion above the ecliptic plane, and the dark blue the portion below the ecliptic plane.

Orbit Viewer applet originally written and kindly provided by Osamu Ajiki (AstroArts), and further modified by Ron Baalke (JPL).


Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1625857129438433 3.5258e-08  
a 2.639826064294649 9.4412e-09 au
q 2.210628061583564 9.2352e-08 au
i 13.79240254010215 3.9826e-06 deg
node 83.49478163450024 1.8377e-05 deg
peri 6.572348804091232 2.2792e-05 deg
M 315.8853857153833 1.4735e-05 deg
tp 2459192.473543487239
(2020-Dec-08.97354349)
6.4583e-05 TDB
period 1566.611808266578
4.29
8.4044e-06
2.301e-08
d
yr
n .2297952805541101 1.2328e-09 deg/d
Q 3.069024067005735 1.0976e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2417  
   data-arc span      40624 days (111.22 yr)  
   first obs. used      1908-10-29  
   last obs. used      2020-01-19  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41655  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 15:42:05  

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] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
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, http://obswww.unige.ch/~behrend/page_cou.html]
[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] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
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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