Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
JPL Small-Body Database Browser
Search: [ help ]  
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 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1852127927375839 2.5768e-08  
a 2.226933407002536 7.1884e-09 au
q 1.814476851450974 5.6338e-08 au
i 6.811571742636552 2.9372e-06 deg
node 117.6240366266113 3.7594e-05 deg
peri 168.553159500511 3.9684e-05 deg
M 136.3613364505697 1.3812e-05 deg
tp 2458540.722175947234
(2019-Feb-26.22217595)
4.5874e-05 TDB
period 1213.833928057724
3.32
5.8773e-06
1.609e-08
d
yr
n .2965809339141164 1.436e-09 deg/d
Q 2.639389962554099 8.5198e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2109  
   data-arc span      17667 days (48.37 yr)  
   first obs. used      1972-06-13  
   last obs. used      2020-10-26  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47503  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 00:04:41  

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. 2019-August); 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 ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-Nov-26 17:03 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin