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187776 (1998 SH55)
Classification: Mars-crossing Asteroid          SPK-ID: 2187776
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2977399178581506 3.4662e-08  
a 2.287690883602606 8.8107e-09 au
q 1.606553987833926 7.9545e-08 au
i 5.046458804118006 5.7822e-06 deg
node 353.7128778340686 7.5369e-05 deg
peri 331.2614877074334 7.6854e-05 deg
M 171.7745855742222 1.8297e-05 deg
tp 2458597.453435281529
(2019-Apr-23.95343528)
6.1808e-05 TDB
period 1263.846817460922
3.46
7.3013e-06
1.999e-08
d
yr
n .284844646539715 1.6456e-09 deg/d
Q 2.968827779371286 1.1434e-08 au
  Orbit Determination Parameters
   # obs. used (total)      372  
   data-arc span      8203 days (22.46 yr)  
   first obs. used      1998-08-04  
   last obs. used      2021-01-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .56367  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 19:51:58  

Additional Information
 Earth MOID = .595293 au 
 Jupiter MOID = 2.38795 au 
 T_jup = 3.536 
[ 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 16.7   n/a MPO254273  

187776 (1998 SH55)          Discovered 1998-Sep-16 by LONEOS at Anderson Mesa
Reference: 20080618/Numbers.arcLast Updated: 2008-06-20

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