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21689 (1999 RL38)
Classification: Main-belt Asteroid          SPK-ID: 2021689
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 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1896733625534424 2.8964e-08  
a 2.406886497090691 9.9346e-09 au
q 1.950364241903024 7.0613e-08 au
i 3.849820201472999 3.5237e-06 deg
node 149.7639234849287 5.6839e-05 deg
peri 161.7970296449313 5.7951e-05 deg
M 235.5348459566122 1.3479e-05 deg
tp 2459472.049319859329
(2021-Sep-14.54931986)
5.265e-05 TDB
period 1363.89784316807
3.73
8.4444e-06
2.312e-08
d
yr
n .2639493872677368 1.6342e-09 deg/d
Q 2.863408752278359 1.1819e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1332  
   data-arc span      9512 days (26.04 yr)  
   first obs. used      1994-04-02  
   last obs. used      2020-04-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53077  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 05:24:56  

Additional Information
 Earth MOID = .936618 au 
 Jupiter MOID = 2.41248 au 
 T_jup = 3.494 
[ 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 15.1   n/a MPO324509  
diameter diameter 5.533 km 0.024 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 10.08457 h n/a LCDB (Rev. 2019-August); 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 0.058   0.008 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21689 (1999 RL38)          Discovered 1999-Sep-13 by Korlevic, K. at Visnjan
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1999 RL38 = 1998 HA21 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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