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JPL Small-Body Database Browser
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990 Yerkes (A922 WE)
Classification: Main-belt Asteroid          SPK-ID: 2000990
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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .217298740357611 4.2077e-08  
a 2.668619460683871 9.4917e-09 au
q 2.088731813383459 1.1176e-07 au
i 8.785176144580934 4.9582e-06 deg
node 353.9475875038922 2.3428e-05 deg
peri 9.597773790673211 2.4908e-05 deg
M 82.84830422324085 1.0161e-05 deg
tp 2458234.054390411332
(2018-Apr-25.55439041)
4.4101e-05 TDB
period 1592.312850441105
4.36
8.4952e-06
2.326e-08
d
yr
n .2260862241363387 1.2062e-09 deg/d
Q 3.248507107984283 1.1554e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2203  
   data-arc span      38759 days (106.12 yr)  
   first obs. used      1913-10-25  
   last obs. used      2019-12-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4293  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-13 20:51:31  

Additional Information
 Earth MOID = 1.0859 au 
 Jupiter MOID = 2.20937 au 
 T_jup = 3.331 
[ 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 11.8   n/a MPO502162  
diameter diameter 21.428 km 0.101 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 24.56 h n/a LCDB (Rev. 2019-January); Warner et al., 2009 Published Reference List:
[Martinez, J.; Aymami, J.M.; Bosque, R.; Martin, J. (2010) Minor Planet Bull. 37, 42-43.]
[Ruthroff, J.C. (2010) Minor Planet Bull. 37, 74.]
geometric albedo albedo 0.061   0.009 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

990 Yerkes (A922 WE)          Discovered 1922-Nov-23 by Van Biesbroeck, G. at Williams Bay
Independent discovery Dec. 14 by M. Wolf, Heidelberg, was announced first.
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 A922 WE = 1961 VB1 = A913 UA 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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