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21748 Srinivasan (1999 RH170)
Classification: Main-belt Asteroid          SPK-ID: 2021748
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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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 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1873253209809497 3.0922e-08  
a 2.226960997000789 6.5445e-09 au
q 1.80979481342556 6.8084e-08 au
i 3.458859335280291 3.9855e-06 deg
node 336.6114288739238 5.2817e-05 deg
peri 320.1804727020377 5.4268e-05 deg
M 239.9420151322397 1.4137e-05 deg
tp 2459801.314343355844
(2022-Aug-09.81434336)
4.8182e-05 TDB
period 1213.856485835771
3.32
5.3508e-06
1.465e-08
d
yr
n .2965754223837515 1.3073e-09 deg/d
Q 2.644127180576017 7.7704e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1361  
   data-arc span      11544 days (31.61 yr)  
   first obs. used      1989-08-28  
   last obs. used      2021-04-06  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .49879  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 18:36:31  

Additional Information
 Earth MOID = .795223 au 
 Jupiter MOID = 2.56188 au 
 T_jup = 3.619 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 15.52   n/a MPCxxxxx  
rotation period rot_per 33.040 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.]

21748 Srinivasan           Discovered 1999 Sept. 9 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Harish Mayur Srinivasan (b. 1987) was awarded second place in the 2005 Intel International Science and Engineering Fair for his computer science team project. He attends the duPont Manual Magnet High School, Louisville, Kentucky, U.S.A.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20050822/MPCPages.arcLast Updated: 2005-08-26

Alternate Designations
 1999 RH170 = 1989 QB1 = 1998 AW5 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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