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21598 (1998 WP9)
Classification: Main-belt Asteroid          SPK-ID: 2021598
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1556583151195055 4.0081e-08  
a 2.334228179134409 6.0633e-09 au
q 1.970886153665876 9.3204e-08 au
i .9689382140759388 4.3237e-06 deg
node 138.2391086099847 0.00024389 deg
peri .670266638177061 0.00024431 deg
M 2.418947980846148 1.4228e-05 deg
tp 2459191.747393244643
(2020-Dec-08.24739324)
5.147e-05 TDB
period 1302.606941893089
3.57
5.0754e-06
1.39e-08
d
yr
n .2763688634092562 1.0768e-09 deg/d
Q 2.697570204602943 7.0071e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1789  
   data-arc span      13761 days (37.68 yr)  
   first obs. used      1983-07-13  
   last obs. used      2021-03-16  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .50094  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:49:48  

Additional Information
 Earth MOID = .984109 au 
 Jupiter MOID = 2.32342 au 
 T_jup = 3.552 
[ 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 14.63   n/a E2021B10  
diameter diameter 3.121 km 0.111 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 50.063 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 sidereal period (not synodic); Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Durech, J.; Hanus, J.; Ali-Lagoa, V. (2018) Astron. Astrophys. 617, A57.]
geometric albedo albedo 0.358   0.066 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21598 (1998 WP9)          Discovered 1998-Nov-28 by Korlevic, K. at Visnjan
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1998 WP9 = 2000 JS45 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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