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100878 (1998 HJ90)
Classification: Main-belt Asteroid          SPK-ID: 2100878
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 16 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1646315448160703 4.4065e-08  
a 2.351115354672356 1.1696e-08 au
q 1.964047601791863 1.0305e-07 au
i 2.886960829035074 4.1338e-06 deg
node 134.1991344511427 9.3846e-05 deg
peri 98.12914385914883 9.4705e-05 deg
M 88.14575754179126 1.2976e-05 deg
tp 2458878.090190256368
(2020-Jan-29.59019026)
4.6767e-05 TDB
period 1316.768211478335
3.61
9.8256e-06
2.69e-08
d
yr
n .2733966364481325 2.0401e-09 deg/d
Q 2.73818310755285 1.3621e-08 au
  Orbit Determination Parameters
   # obs. used (total)      315  
   data-arc span      9119 days (24.97 yr)  
   first obs. used      1995-07-27  
   last obs. used      2020-07-14  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .62379  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-12 20:03:45  

Additional Information
 Earth MOID = .954411 au 
 Jupiter MOID = 2.25518 au 
 T_jup = 3.538 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457230.5 (2015-Jul-27.0) TDB
Reference: JPL 16 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1644797470447441 4.4092e-08  
q 1.96457793721563 1.0304e-07 au
tp 2457560.591930389353
(2016-Jun-21.09193039)
4.5166e-05 TDB
node 134.2228476269682 9.3883e-05 deg
peri 98.03401101949831 9.4742e-05 deg
i 2.885863540406579 4.1327e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      315  
   data-arc span      9119 days (24.97 yr)  
   first obs. used      1995-07-27  
   last obs. used      2020-07-14  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .62379  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-12 20:03:45  

Additional Information
 Jupiter MOID = 2.25518 au 
 T_jup = 3.538 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.944125260023782E-15 -4.523422292946097E-15 -3.890732259267465E-13 2.007699572662086E-14 -7.445372836901691E-14 -2.323678146592373E-15
q -4.523422292946097E-15 1.061725694012412E-14 9.44220015081872E-13 -4.688811864876435E-14 1.778099832482357E-13 5.493978287867585E-15
tp -3.890732259267465E-13 9.44220015081872E-13 2.039955597181306E-9 -6.324355846101207E-12 5.956473692237071E-10 1.342953688768936E-12
node 2.007699572662086E-14 -4.688811864876435E-14 -6.324355846101207E-12 8.814081276476264E-9 -8.803960162968063E-9 7.937822924363163E-11
peri -7.445372836901691E-14 1.778099832482357E-13 5.956473692237071E-10 -8.803960162968063E-9 8.976008456385264E-9 -7.893489943650111E-11
i -2.323678146592373E-15 5.493978287867585E-15 1.342953688768936E-12 7.937822924363163E-11 -7.893489943650111E-11 1.707894198012513E-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 17.30   n/a E2021B55  

100878 (1998 HJ90)          Discovered 1998-Apr-21 by LINEAR at Socorro
Reference: 20051019/Numbers.arcLast Updated: 2005-10-26

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1985-Feb-17 00:00 00:02 Psych 0.0238944722192982 0.0238928359263372 0.0238961085578254 3.87902341344597 3.87902328290905 2446113.499919927 2.377837316825 272.491070994054 79.8733576827133 -86.4195071105275 44629.0593835443 T 16 CATAB v2.0f-lin.ifort 2020-Nov-12 20:03:46 2020-Nov-12 20:03

Alternate Designations
 1998 HJ90 = 1995 OQ9 = 2002 OY18 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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