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251732 (1998 HG49)
Classification: Amor [NEO]          SPK-ID: 2251732
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 42 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1124695793178567 8.2273e-08  
a 1.20053595015915 2.662e-09 au
q 1.065512176888787 9.719e-08 au
i 4.195049064012356 4.3397e-06 deg
node 44.81731495199398 5.8933e-05 deg
peri 324.2705601914313 6.2872e-05 deg
M 279.7189599860662 3.0982e-05 deg
tp 2459307.644941104639
(2021-Apr-03.14494110)
4.1537e-05 TDB
period 480.4643635779405
1.32
1.598e-06
4.375e-09
d
yr
n .7492751331631302 2.4921e-09 deg/d
Q 1.335559723429513 2.9614e-09 au
  Orbit Determination Parameters
   # obs. used (total)      125  
   data-arc span      7646 days (20.93 yr)  
   first obs. used      1998-04-27  
   last obs. used      2019-04-03  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .52638  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-14 02:17:05  

Additional Information
 Earth MOID = .0759325 au 
 Jupiter MOID = 3.8877 au 
 T_jup = 5.286 
[ 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 21.5   n/a MPO470685  

251732 (1998 HG49)          Discovered 1998-Apr-27 by Spacewatch at Kitt Peak
Reference: 20101128/Numbers.arcLast Updated: 2010-12-06

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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