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85820 (1998 XP9)
Classification: Main-belt Asteroid          SPK-ID: 2085820
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08491713435984453 3.8219e-08  
a 3.021018865806787 2.1152e-08 au
q 2.764482600875447 1.2149e-07 au
i 11.53417253178106 5.8159e-06 deg
node 69.46865339127885 2.7739e-05 deg
peri 48.69739762769616 5.5628e-05 deg
M 350.0718941946977 4.5578e-05 deg
tp 2459053.392303226133
(2020-Jul-22.89230323)
0.00024284 TDB
period 1917.911587045993
5.25
2.0143e-05
5.515e-08
d
yr
n .1877041686548646 1.9714e-09 deg/d
Q 3.277555130738127 2.2949e-08 au
  Orbit Determination Parameters
   # obs. used (total)      702  
   data-arc span      7719 days (21.13 yr)  
   first obs. used      1998-12-11  
   last obs. used      2020-01-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .58328  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-23 20:39:14  

Additional Information
 Earth MOID = 1.79628 au 
 Jupiter MOID = 1.92549 au 
 T_jup = 3.210 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457154.5 (2015-May-12.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08455792782214323 3.8291e-08  
q 2.766054792039855 1.2187e-07 au
tp 2457144.491884620812
(2015-May-01.99188462)
0.00024315 TDB
node 69.58188824493152 2.7758e-05 deg
peri 50.23315617759898 5.5623e-05 deg
i 11.53040023097272 5.8104e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      702  
   data-arc span      7719 days (21.13 yr)  
   first obs. used      1998-12-11  
   last obs. used      2020-01-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .58328  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-23 20:39:14  

Additional Information
 Jupiter MOID = 1.92549 au 
 T_jup = 3.210 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.466186896975646E-15 -4.609858721327164E-15 -3.22386323274906E-13 -3.779596806290721E-15 -7.149011113911381E-14 -4.425067456285661E-16
q -4.609858721327164E-15 1.485158285773918E-14 5.293014519337868E-13 1.492185928856178E-14 1.264571950383207E-13 1.699140025622482E-15
tp -3.22386323274906E-13 5.293014519337868E-13 5.911968958080679E-8 -7.716303718867001E-11 1.176682910632984E-8 -2.551884967059344E-11
node -3.779596806290721E-15 1.492185928856178E-14 -7.716303718867001E-11 7.704961006052437E-10 -7.695421597370427E-10 -6.840481904943131E-11
peri -7.149011113911381E-14 1.264571950383207E-13 1.176682910632984E-8 -7.695421597370427E-10 3.093966233008744E-9 6.198547130889207E-11
i -4.425067456285661E-16 1.699140025622482E-15 -2.551884967059344E-11 -6.840481904943131E-11 6.198547130889207E-11 3.376044375135862E-11

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 14.4   n/a MPO453289  
diameter diameter 3.379 km 0.969 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.323   0.140 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

85820 (1998 XP9)          Discovered 1998-Dec-14 by Korlevic, K. at Visnjan
Reference: 20040830/Numbers.arcLast Updated: 2004-09-06

[ show close-approach data ]
Alternate Designations
 1998 XP9 = 2000 EQ28 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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