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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 | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1482124434527043 3.3869e-08  
a 2.551986599718113 1.0743e-08 au
q 2.173750430115333 8.6872e-08 au
i 3.717608594644654 3.5571e-06 deg
node 286.6591364651976 5.8409e-05 deg
peri 256.166640957738 5.9979e-05 deg
M 265.3450946793333 1.5338e-05 deg
tp 2459592.022419586320
(2022-Jan-12.52241959)
6.4245e-05 TDB
period 1489.073076282515
4.08
9.4024e-06
2.574e-08
d
yr
n .2417611370012433 1.5265e-09 deg/d
Q 2.930222769320893 1.2335e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1775  
   data-arc span      16052 days (43.95 yr)  
   first obs. used      1977-03-26  
   last obs. used      2021-03-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .47398  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:40:25  

Additional Information
 Earth MOID = 1.17941 au 
 Jupiter MOID = 2.05234 au 
 T_jup = 3.421 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.95   n/a E2021B10  
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

[ show close-approach data ]
Alternate Designations
 1999 US13 = 1977 FE2 = 1994 NG6 = 1997 HB 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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