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21245 (1995 XQ4)
Classification: Main-belt Asteroid          SPK-ID: 2021245
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 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08355758502839022 5.0982e-08  
a 2.780814471058078 1.4348e-08 au
q 2.548456329444464 1.3933e-07 au
i 5.396153563777963 3.9416e-06 deg
node 117.9177602750493 4.7063e-05 deg
peri 254.1900346293641 5.2171e-05 deg
M 146.5701201540857 2.2744e-05 deg
tp 2458310.896602991534
(2018-Jul-11.39660299)
0.0001064 TDB
period 1693.777849551197
4.64
1.3109e-05
3.589e-08
d
yr
n .2125426307206637 1.6449e-09 deg/d
Q 3.013172612671691 1.5546e-08 au
  Orbit Determination Parameters
   # obs. used (total)      994  
   data-arc span      8819 days (24.15 yr)  
   first obs. used      1995-12-14  
   last obs. used      2020-02-05  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51767  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 23:20:47  

Additional Information
 Earth MOID = 1.55464 au 
 Jupiter MOID = 2.41655 au 
 T_jup = 3.322 
[ 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 15.0   n/a MPO452470  
diameter diameter 6.085 km 0.324 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.033   0.002 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21245 (1995 XQ4)          Discovered 1995-Dec-14 by Spacewatch at Kitt Peak
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1995 XQ4 = 1999 RL186 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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