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100831 (1998 HW9)
Classification: Main-belt Asteroid          SPK-ID: 2100831
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 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1868397368210783 3.1846e-08  
a 2.315968308144007 7.8596e-09 au
q 1.883253398964422 7.2952e-08 au
i 3.649495287419743 3.7148e-06 deg
node 106.156258711909 7.2358e-05 deg
peri 163.4833382835386 7.3442e-05 deg
M 53.52454373176505 1.3818e-05 deg
tp 2458809.097406468715
(2019-Nov-21.59740647)
4.901e-05 TDB
period 1287.352098068792
3.52
6.5533e-06
1.794e-08
d
yr
n .2796437746441321 1.4235e-09 deg/d
Q 2.748683217323591 9.3281e-09 au
  Orbit Determination Parameters
   # obs. used (total)      872  
   data-arc span      8224 days (22.52 yr)  
   first obs. used      1998-04-19  
   last obs. used      2020-10-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .55891  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-12 20:04:00  

Additional Information
 Earth MOID = .867447 au 
 Jupiter MOID = 2.34873 au 
 T_jup = 3.555 
[ 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 16.0   n/a MPO436469  
rotation period rot_per 5.203 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]

100831 (1998 HW9)          Discovered 1998-Apr-19 by Spacewatch at Kitt Peak
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
2159-Nov-18 06:47 < 00:01 Amphi 0.0379642269012847 0.0379498750772363 0.0379785865892659 5.0137005877195 5.0137005575172 2509939.782549767 0.416333407410567 1121.42681279937 50.2939538663329 -50.41841159401 87061.7758039998 T 22 CATAB v2.0f-lin.ifort 2020-Nov-12 20:04:02 2020-Nov-12 20:04

Alternate Designations
 1998 HW9 = 2001 DD15 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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