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8157 (1988 XG2)
Classification: Main-belt Asteroid          SPK-ID: 2008157
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 .1974555436130422 3.6464e-08  
a 2.796742632210186 1.2153e-08 au
q 2.244510295421353 1.0646e-07 au
i 7.112332332442705 3.2657e-06 deg
node 264.4731785563825 4.169e-05 deg
peri 181.4939324767793 4.3638e-05 deg
M 311.649551674281 1.3737e-05 deg
tp 2459429.943197047915
(2021-Aug-03.44319705)
6.5777e-05 TDB
period 1708.351293473166
4.68
1.1135e-05
3.049e-08
d
yr
n .2107294918646981 1.3736e-09 deg/d
Q 3.348974968999019 1.4553e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1949  
   data-arc span      24330 days (66.61 yr)  
   first obs. used      1954-07-04  
   last obs. used      2021-02-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4755  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 20:22:36  

Additional Information
 Earth MOID = 1.26046 au 
 Jupiter MOID = 1.88666 au 
 T_jup = 3.287 
[ 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 13.54   n/a E2021B10  
diameter diameter 11.864 km 0.282 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 8.51876 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 sidereal period (not synodic); Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Durech, J.; Hanus, J.; Ali-Lagoa, V. (2018) Astron. Astrophys. 617, A57.]
geometric albedo albedo 0.066   0.018 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

8157 (1988 XG2)          Discovered 1988-Dec-15 by Oshima, Y. at Gekko
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 1988 XG2 = 1983 VX4 = 1992 SB24 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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