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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 39 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2176322555850317 4.2079e-08  
a 2.667780195738722 9.2954e-09 au
q 2.087185174335027 1.1169e-07 au
i 8.787424749166417 4.941e-06 deg
node 353.940143030803 2.2094e-05 deg
peri 9.552881427476425 2.3563e-05 deg
M 173.3472493219628 1.0332e-05 deg
tp 2458234.130968027434
(2018-Apr-25.63096803)
4.3744e-05 TDB
period 1591.561750124457
4.36
8.3183e-06
2.277e-08
d
yr
n .2261929202381552 1.1822e-09 deg/d
Q 3.248375217142418 1.1318e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2303  
   data-arc span      38817 days (106.28 yr)  
   first obs. used      1913-10-25  
   last obs. used      2020-02-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42471  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 15:42:31  

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

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
2174-Dec-20 08:50 00:02 Vesta 0.0386793414778107 0.0386754121123219 0.0386832745158835 6.70097141328757 6.70097095421878 2515450.867940159 1.8691960489209 634.958637300167 36.429844596542 72.3325317148328 151135.796617852 T 39 CATAB v2.0f-lin.ifort 2020-Feb-22 15:42:47 2020-Feb-22 15:42

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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