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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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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 41 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2176322521610289 4.2056e-08  
a 2.667780193738113 9.1149e-09 au
q 2.087185181904301 1.1162e-07 au
i 8.787424508382069 4.9315e-06 deg
node 353.9401466861682 2.0564e-05 deg
peri 9.552880958831526 2.2044e-05 deg
M 173.3472478774949 1.0293e-05 deg
tp 2458234.130975275502
(2018-Apr-25.63097528)
4.3486e-05 TDB
period 1591.561748334152
4.36
8.1568e-06
2.233e-08
d
yr
n .2261929204925935 1.1592e-09 deg/d
Q 3.248375205571925 1.1099e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2574  
   data-arc span      38951 days (106.64 yr)  
   first obs. used      1913-10-25  
   last obs. used      2020-06-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .40993  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:24:28  

Additional Information
 Earth MOID = 1.0852 au 
 Jupiter MOID = 2.21299 au 
 T_jup = 3.332 
[ 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-August); 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

[ show close-approach data ]
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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