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118212 (1995 XM4)
Classification: Main-belt Asteroid          SPK-ID: 2118212
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 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07094720802886548 3.7569e-08  
a 2.764485488222267 1.6912e-08 au
q 2.568352961196582 1.0546e-07 au
i 5.309981692905049 4.4041e-06 deg
node 116.9377672091991 4.629e-05 deg
peri 297.6248832829993 5.735e-05 deg
M 168.386708890772 3.4599e-05 deg
tp 2458415.218788665360
(2018-Oct-23.71878867)
0.00015961 TDB
period 1678.880939848117
4.60
1.5406e-05
4.218e-08
d
yr
n .2144285466916839 1.9677e-09 deg/d
Q 2.960618015247952 1.8112e-08 au
  Orbit Determination Parameters
   # obs. used (total)      747  
   data-arc span      9197 days (25.18 yr)  
   first obs. used      1995-12-14  
   last obs. used      2021-02-17  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .49668  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 16:56:13  

Additional Information
 Earth MOID = 1.58458 au 
 Jupiter MOID = 2.27864 au 
 T_jup = 3.330 
[ 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 15.48   n/a E2021B55  
diameter diameter 5.292 km 0.102 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 12.00 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on fragmentary lightcurve(s), may be completely wrong.
Published Reference List:
[Chang, C.-K.; Lin, H.-W.; Ip, W.-H.; Prince, T.A.; et al. (2016) Astrophys. J. Sup. Ser. 227, A20.]
geometric albedo albedo 0.052   0.011 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

118212 (1995 XM4)          Discovered 1995-Dec-14 by Spacewatch at Kitt Peak
Reference: 20051116/Numbers.arcLast Updated: 2005-11-21

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Alternate Designations
 1995 XM4 = 1999 RB257 = 2000 YB44 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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