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21683 Segal (1999 RL33)
Classification: Main-belt Asteroid          SPK-ID: 2021683
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 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1237081070860803 3.2389e-08  
a 2.27797971266006 6.5421e-09 au
q 1.996175154426391 7.4921e-08 au
i 5.2071601271925 3.2679e-06 deg
node 329.1957125819202 4.4818e-05 deg
peri 110.2667891166215 4.9376e-05 deg
M 38.14457104239759 1.7938e-05 deg
tp 2459263.438186095925
(2021-Feb-17.93818610)
6.2758e-05 TDB
period 1255.807882915337
3.44
5.4098e-06
1.481e-08
d
yr
n .286668052412815 1.2349e-09 deg/d
Q 2.55978427089373 7.3514e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1939  
   data-arc span      16133 days (44.17 yr)  
   first obs. used      1977-03-12  
   last obs. used      2021-05-13  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .45331  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 15:02:17  

Additional Information
 Earth MOID = 1.01883 au 
 Jupiter MOID = 2.64242 au 
 T_jup = 3.592 
[ 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 14.62   n/a MPCxxxxx  
diameter diameter 4.293 km 1.093 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2015ApJ...814..117N)  
geometric albedo albedo 0.173   0.096 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

21683 Segal           Discovered 1999 Sept. 9 by C. W. Juels at Fountain Hills.
Bruce A. Segal (b. 1959), an eye physician and surgeon in Florida, is also an amateur astronomer. Since 1999 he has participated in an ongoing minor-planet astrometry program at Jupiter Observatory using automated equipment.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20031110/MPCPages.arcLast Updated: 2003-11-12

Alternate Designations
 1999 RL33 = 1977 EZ4 = 1979 YP9 = 1989 VL2 = 1998 KF13 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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