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42923 (1999 SR18)
Classification: Main-belt Asteroid          SPK-ID: 2042923
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1852127924916398 2.5763e-08  
a 2.226933406871719 7.1827e-09 au
q 1.814476851892087 5.6329e-08 au
i 6.811571757485994 2.9361e-06 deg
node 117.6240374975317 3.7348e-05 deg
peri 168.5531592010965 3.943e-05 deg
M 136.3613359989201 1.3772e-05 deg
tp 2458540.722177510602
(2019-Feb-26.22217751)
4.5729e-05 TDB
period 1213.833927950767
3.32
5.8726e-06
1.608e-08
d
yr
n .2965809339402496 1.4349e-09 deg/d
Q 2.639389961851351 8.513e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2132  
   data-arc span      17687 days (48.42 yr)  
   first obs. used      1972-06-13  
   last obs. used      2020-11-15  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4756  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-17 21:16:02  

Additional Information
 Earth MOID = .798668 au 
 Jupiter MOID = 2.52479 au 
 T_jup = 3.613 
[ 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 13.9   n/a MPO324695  
diameter diameter 3.816 km 0.767 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)  
rotation period rot_per 8.392 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Clark, M. (2007) Minor Planet Bull. 34, 19-22.]
[Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.]
geometric albedo albedo 0.347   0.144 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)  

42923 (1999 SR18)          Discovered 1999-Sep-30 by LINEAR at Socorro
Reference: 20020624/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1999 SR18 = 1972 LA1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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