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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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .185085237591096 1.6563e-08  
a 2.227084305606426 6.6784e-09 au
q 1.81488387776786 3.6061e-08 au
i 6.811446996815572 6.0414e-07 deg
node 117.6232822970697 4.8702e-06 deg
peri 168.6218416329284 6.8905e-06 deg
M 253.7009693460752 5.0098e-06 deg
tp 2459754.951346759537
(2022-Jun-24.45134676)
1.7924e-05 TDB
period 1213.957305533235
3.32
5.4605e-06
1.495e-08
d
yr
n .2965507916622065 1.3339e-09 deg/d
Q 2.639284733444993 7.9145e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2494  
   data-arc span      17883 days (48.96 yr)  
   first obs. used      1972-06-13  
   last obs. used      2021-05-30  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4585  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 07:38:04  

Additional Information
 Earth MOID = .798748 au 
 Jupiter MOID = 2.52324 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 14.00   n/a MPCxxxxx  
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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