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100871 (1998 HH81)
Classification: Main-belt Asteroid          SPK-ID: 2100871
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 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1153957812480237 4.3764e-08  
a 2.297885719024411 8.9274e-09 au
q 2.032719401258912 9.9627e-08 au
i 2.012266250639265 4.554e-06 deg
node 199.1806256403116 0.00010996 deg
peri 24.09216624972359 0.00011112 deg
M 115.3810821706401 1.5598e-05 deg
tp 2458592.722580577959
(2019-Apr-19.22258058)
5.4705e-05 TDB
period 1272.304508072031
3.48
7.4144e-06
2.03e-08
d
yr
n .2829511313651801 1.6489e-09 deg/d
Q 2.563052036789909 9.9575e-09 au
  Orbit Determination Parameters
   # obs. used (total)      434  
   data-arc span      8222 days (22.51 yr)  
   first obs. used      1998-04-21  
   last obs. used      2020-10-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .58628  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-12 20:03:48  

Additional Information
 Earth MOID = 1.02408 au 
 Jupiter MOID = 2.41087 au 
 T_jup = 3.584 
[ 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 17.1   n/a MPO432536  

100871 (1998 HH81)          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
2180-Apr-20 05:00 < 00:01 Hebe 0.046544791878543 0.046530855266312 0.0465587429015116 7.6431428951714 7.64314287769651 2517398.708166686 0.654781146881387 1471.15395083722 62.8511714064293 -61.8983865187371 97732.5958925003 T 15 CATAB v2.0f-lin.ifort 2020-Nov-12 20:03:49 2020-Nov-12 20:03

Alternate Designations
 1998 HH81 = 2002 PH18 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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