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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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 175 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4163167142272742 1.7989e-08  
a 1.656644069726171 8.6698e-09 au
q .966955453973672 3.0872e-08 au
i 62.71047165293685 1.9501e-06 deg
node 235.6522580694304 2.7416e-06 deg
peri 301.2572687719619 4.4553e-06 deg
M 109.9191586535305 1.2188e-05 deg
tp 2459158.699295487394
(2020-Nov-05.19929549)
2.4708e-05 TDB
period 778.8292293464408
2.13
6.1139e-06
1.674e-08
d
yr
n .4622322666319241 3.6285e-09 deg/d
Q 2.34633268547867 1.2279e-08 au
  Orbit Determination Parameters
   # obs. used (total)      796  
   data-arc span      10239 days (28.03 yr)  
   first obs. used      1993-05-24  
   last obs. used      2021-06-05  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .48063  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Sep-07 06:21:37  

Additional Information
 Earth MOID = .109376 au 
 Jupiter MOID = 3.132 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 15.39   n/a MPCxxxxx  
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. 2020-October); 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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