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20794 Ryanolson (2000 SD161)
Classification: Main-belt Asteroid          SPK-ID: 2020794
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .166075179353364 4.0624e-08  
a 2.297616181781243 7.6267e-09 au
q 1.916039162306732 9.393e-08 au
i 5.095057138478648 3.7671e-06 deg
node 305.2176594369647 4.7734e-05 deg
peri 84.94676333552165 4.9275e-05 deg
M 323.7994037160138 1.1711e-05 deg
tp 2459328.416884140059
(2021-Apr-23.91688414)
4.1574e-05 TDB
period 1272.08065660488
3.48
6.3338e-06
1.734e-08
d
yr
n .2830009230395989 1.4091e-09 deg/d
Q 2.679193201255755 8.8933e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1307  
   data-arc span      11389 days (31.18 yr)  
   first obs. used      1989-09-03  
   last obs. used      2020-11-08  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .51741  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:31:41  

Additional Information
 Earth MOID = .928108 au 
 Jupiter MOID = 2.78315 au 
 T_jup = 3.570 
[ 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 15.29   n/a E2021B10  
diameter diameter 2.164 km 0.440 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 2.645 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on fragmentary lightcurve(s), may be completely wrong.
Published Reference List:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.344   0.209 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20794 Ryanolson           Discovered 2000 Sept. 27 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Ryan Olson (b. 1986) was awarded second place in the 2004 Intel International Science and Engineering Fair for his engineering project. He attends the Giles High School, Pearisburg, Virginia, 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: 20041226/MPCPages.arcLast Updated: 2004-12-25

Alternate Designations
 2000 SD161 = 1989 RR = 1996 TH59 = 1998 FN97 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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