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JPL Small-Body Database Browser
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85818 (1998 XM4)
Classification: Apollo [NEO]          SPK-ID: 2085818
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 168 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4163675269094086 5.4188e-08  
a 1.656675907315927 1.6458e-08 au
q .9668898568963935 9.0479e-08 au
i 62.71396872697738 1.2736e-05 deg
node 235.6567645182818 6.3688e-06 deg
peri 301.2556065789744 1.4414e-05 deg
M 286.874406748969 3.167e-05 deg
tp 2459158.705531169411
(2020-Nov-05.20553117)
7.0663e-05 TDB
period 778.8516809083785
2.13
1.1606e-05
3.178e-08
d
yr
n .4622189420970759 6.8876e-09 deg/d
Q 2.34646195773546 2.331e-08 au
  Orbit Determination Parameters
   # obs. used (total)      760  
   data-arc span      9702 days (26.56 yr)  
   first obs. used      1993-05-24  
   last obs. used      2019-12-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48535  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-17 14:00:18  

Additional Information
 Earth MOID = .108925 au 
 Jupiter MOID = 3.13427 au 
 T_jup = 3.611 
[ 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 15.4   n/a MPO436375  
diameter diameter 2.028 km 0.018 urn:nasa:pds:neowise_diameters_albedos::2.0[neos] (http://adsabs.harvard.edu/abs/2011ApJ...743..156M)  
rotation period rot_per 19.451 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Skiff, B.A.; McLelland, K.P.; Sanborn, J.J.; Pravec, P.; Koehn, B.W. (2019) Minor Plantet Bull. 46, 238-265.]
geometric albedo albedo 0.168   0.034 urn:nasa:pds:neowise_diameters_albedos::2.0[neos] (http://adsabs.harvard.edu/abs/2011ApJ...743..156M)  
SMASSII spectral type spec_B S   n/a Binzel et al. (2004) Icarus 170, 259-294  

85818 (1998 XM4)          Discovered 1998-Dec-10 by LINEAR at Socorro
Reference: 20040830/Numbers.arcLast Updated: 2004-09-06

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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