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21724 Ratai (1999 RA132)
Classification: Main-belt Asteroid          SPK-ID: 2021724
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 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1257137742680778 3.5011e-08  
a 2.327532367651851 7.7271e-09 au
q 2.034929488983222 8.1477e-08 au
i 5.749149156371637 3.837e-06 deg
node 211.8617999904241 3.6337e-05 deg
peri 150.927667625971 3.9032e-05 deg
M 31.34582840341904 1.5046e-05 deg
tp 2459283.567414344007
5.4037e-05 TDB
period 1297.0061059775
n .2775623016274723 1.3822e-09 deg/d
Q 2.620135246320481 8.6985e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1730  
   data-arc span      12877 days (35.26 yr)  
   first obs. used      1985-09-20  
   last obs. used      2020-12-22  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .52002  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 15:02:47  

Additional Information
 Earth MOID = 1.03425 au 
 Jupiter MOID = 2.84998 au 
 T_jup = 3.556 
[ 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 14.95   n/a E2021B10  
diameter diameter 2.109 km 0.556 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 24.9432 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 0.397   0.135 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  

21724 Ratai           Discovered 1999 Sept. 9 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Daniel Ratai (b. 1985) was awarded first place and Best in Category in the 2005 Intel International Science and Engineering Fair for his computer science project. He also received the Achievement Award and the Seaborg SIYSS Award. He attends the John von Neumann Computer Science High School, Budapest, Hungary.
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 RA132 = 1985 ST4 = 1991 HZ3 = 1998 HB19 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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