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21024 (1989 GD3)
Classification: Main-belt Asteroid          SPK-ID: 2021024
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 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .168138664026001 3.3136e-08  
a 2.596914484148585 9.9752e-09 au
q 2.16027275219407 8.329e-08 au
i 13.46505579951991 3.5953e-06 deg
node 216.3266418386137 1.4991e-05 deg
peri 48.93756892671232 1.8865e-05 deg
M 159.6326388428652 1.2188e-05 deg
tp 2458522.696055395411
(2019-Feb-08.19605540)
5.0294e-05 TDB
period 1528.568479644338
4.18
8.8073e-06
2.411e-08
d
yr
n .2355144730472027 1.357e-09 deg/d
Q 3.033556216103099 1.1652e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1933  
   data-arc span      11643 days (31.88 yr)  
   first obs. used      1989-04-03  
   last obs. used      2021-02-17  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .47142  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:36:14  

Additional Information
 Earth MOID = 1.16902 au 
 Jupiter MOID = 2.07 au 
 T_jup = 3.358 
[ 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 13.97   n/a E2021B10  
diameter diameter 4.311 km 0.068 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 5.76534 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 sidereal period (not synodic); Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Durech, J.; Hanus, J.; Ali-Lagoa, V. (2018) Astron. Astrophys. 617, A57.]
geometric albedo albedo 0.329   0.036 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21024 (1989 GD3)          Discovered 1989-Apr-03 by Elst, E. W. at La Silla
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1989 GD3 = 1998 QE64 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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