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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 ]

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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1868397380836038 3.1754e-08  
a 2.315968307951235 7.8502e-09 au
q 1.883253395883699 7.271e-08 au
i 3.649495129172054 3.6968e-06 deg
node 106.1562574641355 7.23e-05 deg
peri 163.4833397611379 7.3385e-05 deg
M 53.52454368975025 1.3818e-05 deg
tp 2458809.097406642856
(2019-Nov-21.59740664)		 4.9009e-05 TDB
period 1287.352097908061
3.52		 6.5454e-06
1.792e-08		 d
yr
n .2796437746790468 1.4218e-09 deg/d
Q 2.74868322001877 9.3169e-09 au
   Orbit Determination Parameters
   # obs. used (total)      880  
   data-arc span      8247 days (22.58 yr)  
   first obs. used      1998-04-19  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .55832  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-17 22:28:33  

Additional Information
 Earth MOID = .867447 au 
 Jupiter MOID = 2.34873 au 
 T_jup = 3.555 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457153.5 (2015-May-11.0) TDB
Reference: JPL 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1864204477938486 3.1789e-08  
q 1.885281100859083 7.275e-08 au
tp 2457521.225566639503
(2016-May-12.72556664)		 4.6894e-05 TDB
node 106.1803832162535 7.2289e-05 deg
peri 163.3981607961127 7.3376e-05 deg
i 3.649193184746117 3.6962e-06 deg
   Orbit Determination Parameters
   # obs. used (total)      880  
   data-arc span      8247 days (22.58 yr)  
   first obs. used      1998-04-19  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .55832  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-17 22:28:33  

Additional Information
 Jupiter MOID = 2.34873 au 
 T_jup = 3.555 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.010564787929696E-15 -2.304013695564127E-15 5.841218225121422E-14 6.093414703901512E-15 8.506152902307552E-15 5.235826768559116E-16
q -2.304013695564127E-15 5.292532271289969E-15 -4.720890666421096E-14 -1.443465936887147E-14 3.982497701669981E-16 -1.153850773799011E-15
tp 5.841218225121422E-14 -4.720890666421096E-14 2.199022480088494E-9 -1.046327668685876E-11 6.137584544509048E-10 7.190228641594293E-13
node 6.093414703901512E-15 -1.443465936887147E-14 -1.046327668685876E-11 5.225675019640349E-9 -5.217545435151836E-9 3.366244110812862E-11
peri 8.506152902307552E-15 3.982497701669981E-16 6.137584544509048E-10 -5.217545435151836E-9 5.384009539830795E-9 -3.340011855088417E-11
i 5.235826768559116E-16 -1.153850773799011E-15 7.190228641594293E-13 3.366244110812862E-11 -3.340011855088417E-11 1.366197524220292E-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 16.0   n/a MPO436469  
rotation period rot_per 5.203 h n/a LCDB (Rev. 2020-October); 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

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