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20293 Sirichelson (1998 FQ72)
Classification: Main-belt Asteroid          SPK-ID: 2020293
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 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1941119709608313 3.3855e-08  
a 2.441687996031964 7.2145e-09 au
q 1.967727126650797 8.3699e-08 au
i 3.255761025010063 3.4822e-06 deg
node 30.71816655847108 6.9135e-05 deg
peri 317.6854961682957 6.9715e-05 deg
M 203.0779914768121 9.9741e-06 deg
tp 2459807.956294351908
(2022-Aug-16.45629435)
3.9681e-05 TDB
period 1393.585692821237
3.82
6.1764e-06
1.691e-08
d
yr
n .2583264178546494 1.1449e-09 deg/d
Q 2.915648865413131 8.6149e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2825  
   data-arc span      14767 days (40.43 yr)  
   first obs. used      1980-10-10  
   last obs. used      2021-03-16  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .41416  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:16:36  

Additional Information
 Earth MOID = .96111 au 
 Jupiter MOID = 2.50914 au 
 T_jup = 3.473 
[ 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 14.31   n/a E2021B10  
diameter diameter 3.944 km 0.271 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 4.35868 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:
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
geometric albedo albedo 0.285   0.057 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20293 Sirichelson           Discovered 1998 Mar. 20 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Silas Isaac Richelson (b. 1986) is a finalist in the 2004 Intel Science Talent Search, a science competition for high school seniors, for his mathematics project. He attends the Byram Hills High School, Armonk, New York.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20040415/MPCPages.arcLast Updated: 2004-04-20

Alternate Designations
 1998 FQ72 = 1980 TJ7 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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