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21743 Michaelsegal (1999 RB164)
Classification: Main-belt Asteroid          SPK-ID: 2021743
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05211413036909639 5.7787e-08  
a 2.587007133433001 1.138e-08 au
q 2.452187506415491 1.474e-07 au
i 5.765097943724283 5.1688e-06 deg
node 332.8869060177767 4.3079e-05 deg
peri 20.86028709233057 5.6929e-05 deg
M 345.1706044796775 3.6249e-05 deg
tp 2459063.105979407350
(2020-Aug-01.60597941)
0.00015298 TDB
period 1519.829487031971
4.16
1.0028e-05
2.746e-08
d
yr
n .2368686770928713 1.5629e-09 deg/d
Q 2.721826760450511 1.1973e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1275  
   data-arc span      10606 days (29.04 yr)  
   first obs. used      1991-10-11  
   last obs. used      2020-10-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51643  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 01:55:13  

Additional Information
 Earth MOID = 1.4469 au 
 Jupiter MOID = 2.51405 au 
 T_jup = 3.413 
[ 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 14.6   n/a MPO384940  
diameter diameter 6.268 km 0.104 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.086   0.011 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21743 Michaelsegal           Discovered 1999 Sept. 9 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Michael Segal (b. 1987) was awarded first place and Best in Category in the 2005 Intel International Science and Engineering Fair for his biochemistry project. He attends the Central High School, Philadelphia, Pennsylvania, 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 RB164 = 1998 KT57 = 1999 TT128 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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