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18870 (1999 US13)
Classification: Main-belt Asteroid          SPK-ID: 2018870
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 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1481639827117368 3.3828e-08  
a 2.552344389022632 1.0769e-08 au
q 2.174178879093084 8.6774e-08 au
i 3.717306521016921 3.5568e-06 deg
node 286.6599238882945 5.837e-05 deg
peri 256.1053817703795 5.9942e-05 deg
M 312.777681143996 1.543e-05 deg
tp 2459591.867422015500
(2022-Jan-12.36742202)
6.425e-05 TDB
period 1489.386240011752
4.08
9.4258e-06
2.581e-08
d
yr
n .2417103034315392 1.5297e-09 deg/d
Q 2.93050989895218 1.2364e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1783  
   data-arc span      16085 days (44.04 yr)  
   first obs. used      1977-03-26  
   last obs. used      2021-04-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .47328  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 18:04:51  

Additional Information
 Earth MOID = 1.18116 au 
 Jupiter MOID = 2.05122 au 
 T_jup = 3.421 
[ 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 13.96   n/a MPCxxxxx  
diameter diameter 4.533 km 0.151 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.164   0.017 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

18870 (1999 US13)          Discovered 1999-Oct-29 by CSS at Catalina
Reference: 20001111/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1999 US13 = 1977 FE2 = 1994 NG6 = 1997 HB 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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