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JPL Small-Body Database Browser
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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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1853248774420613 2.6576e-08  
a 2.226645712064925 7.3597e-09 au
q 1.813992868369601 5.8405e-08 au
i 6.811417441636988 3.0774e-06 deg
node 117.6265455194648 3.9875e-05 deg
peri 168.4875177736805 4.2017e-05 deg
M 17.76846446135516 1.404e-05 deg
tp 2458540.600595452262
(2019-Feb-26.10059545)
4.725e-05 TDB
period 1213.598714964084
3.32
6.0169e-06
1.647e-08
d
yr
n .2966384156155389 1.4707e-09 deg/d
Q 2.639298555760248 8.7236e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1942  
   data-arc span      17339 days (47.47 yr)  
   first obs. used      1972-06-13  
   last obs. used      2019-12-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47318  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-14 03:27:51  

Additional Information
 Earth MOID = .797551 au 
 Jupiter MOID = 2.52345 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. 2019-January); 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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