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21243 (1995 XG1)
Classification: Main-belt Asteroid          SPK-ID: 2021243
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 39 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1335325169655008 1.78e-08  
a 2.555249513711805 1.0922e-08 au
q 2.214040614670996 4.8923e-08 au
i 12.80405615017088 8.8619e-07 deg
node 276.0459728635802 5.7904e-06 deg
peri 304.3929341040762 9.8866e-06 deg
M 277.7209387308174 1.0934e-05 deg
tp 2459541.484961523601
(2021-Nov-22.98496152)
4.5977e-05 TDB
period 1491.929833118716
4.08
9.5653e-06
2.619e-08
d
yr
n .2412982112218101 1.5471e-09 deg/d
Q 2.896458412752615 1.238e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1983  
   data-arc span      9214 days (25.23 yr)  
   first obs. used      1995-12-15  
   last obs. used      2021-03-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46968  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:42:13  

Additional Information
 Earth MOID = 1.22934 au 
 Jupiter MOID = 2.21632 au 
 T_jup = 3.391 
[ 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 13.87   n/a E2021B10  
diameter diameter 4.278 km 0.217 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.319   0.032 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21243 (1995 XG1)          Discovered 1995-Dec-15 by Kobayashi, T. at Oizumi
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1995 XG1 = 1998 QX73 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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