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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 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 
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Orbital Elements at Epoch 2456117.5 (2012-Jul-09.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1610566678749346 3.4957e-08  
q 2.215378132010666 9.1332e-08 au
tp 2456053.263996248238
(2012-May-05.76399625)
5.9973e-05 TDB
node 83.57478896442053 1.8413e-05 deg
peri 5.782537890687136 2.297e-05 deg
i 13.77633135579631 3.9774e-06 deg
  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
 Jupiter MOID = 2.16204 au 
 T_jup = 3.336 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.222024143857438E-15 -3.180566184298667E-15 3.037037871303428E-13 3.083488797489943E-15 5.655105134686693E-14 -1.262983546916941E-15
q -3.180566184298667E-15 8.341614545054595E-15 -6.896099079072747E-13 -6.823534029699226E-15 -1.259676119939393E-13 3.30246737429378E-15
tp 3.037037871303428E-13 -6.896099079072747E-13 3.596719461386289E-9 7.708905097348605E-12 8.465748283257514E-10 -2.468282459225585E-12
node 3.083488797489943E-15 -6.823534029699226E-15 7.708905097348605E-12 3.390348792759567E-10 -3.270485627647901E-10 4.039882667925907E-12
peri 5.655105134686693E-14 -1.259676119939393E-13 8.465748283257514E-10 -3.270485627647901E-10 5.276200635793527E-10 -4.552193949384255E-12
i -1.262983546916941E-15 3.30246737429378E-15 -2.468282459225585E-12 4.039882667925907E-12 -4.552193949384255E-12 1.581935813180864E-11

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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