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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 167 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4164952300358854 5.4243e-08  
a 1.656553125404528 1.656e-08 au
q .9666066503725043 9.0609e-08 au
i 62.71724390087015 1.2859e-05 deg
node 235.6533316000631 6.376e-06 deg
peri 301.2690067427657 1.4436e-05 deg
M 101.9535099063382 2.922e-05 deg
tp 2458379.950458110972
(2018-Sep-18.45045811)
6.0291e-05 TDB
period 778.7650974742368
2.13
1.1678e-05
3.197e-08
d
yr
n .4622703317952813 6.9317e-09 deg/d
Q 2.346499600436552 2.3457e-08 au
  Orbit Determination Parameters
   # obs. used (total)      756  
   data-arc span      9663 days (26.46 yr)  
   first obs. used      1993-05-24  
   last obs. used      2019-11-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48554  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-08 20:17:34  

Additional Information
 Earth MOID = .108574 au 
 Jupiter MOID = 3.1345 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)  
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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