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136993 (1998 ST49)
Classification: Apollo [NEO]          SPK-ID: 2136993
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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 142 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .5953336492863728 1.5086e-08  
a 2.307928778114629 2.3865e-09 au
q .9339411163466075 3.4553e-08 au
i 24.4861750698469 6.0189e-06 deg
node 18.20865242196482 2.3998e-06 deg
peri 48.07923361449044 5.7547e-06 deg
M 162.5625133160345 1.742e-06 deg
tp 2458818.204337378710
(2019-Nov-30.70433738)
5.3973e-06 TDB
period 1280.654649691184
3.51
1.9864e-06
5.438e-09
d
yr
n .2811062296043748 4.3602e-10 deg/d
Q 3.68191643988265 3.8073e-09 au
  Orbit Determination Parameters
   # obs. used (total)      745  
   # delay obs. used      5  
   # Doppler obs. used      2  
   data-arc span      7882 days (21.58 yr)  
   first obs. used      1998-09-29  
   last obs. used      2020-04-28  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .38601  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 18:19:51  

Additional Information
 Earth MOID = .05494 au 
 Jupiter MOID = 2.16271 au 
 T_jup = 3.229 
[ 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 17.77   n/a E2021B55  
rotation period rot_per 2.3017 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Galad, A. (2007) Earth, Moon, and Planets 100, 77-82.]
[Hicks, M.; Brewer, M.; Somers, J. (2012) Astronomer's Telegram 4588. http://www.astronomerstelegram.org]
[Observers at Arecibo and Goldstone. (2012) http://www.naic.edu/~pradar/ http://www.jpl.nasa.gov/asteroidwatch]
SMASSII spectral type spec_B Q   n/a Binzel et al. (2001) Icarus 151, 139-149  

136993 (1998 ST49)          Discovered 1998-Sep-29 by LINEAR at Socorro
Reference: 20061205/Numbers.arcLast Updated: 2006-12-13

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