Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
JPL Small-Body Database Browser
Search: [ help ]  
21724 Ratai (1999 RA132)
Classification: Main-belt Asteroid          SPK-ID: 2021724
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1263084950667392 3.6807e-08  
a 2.328492971634664 7.9209e-09 au
q 2.03438452861401 8.5304e-08 au
i 5.748652005185444 3.9635e-06 deg
node 211.9057918221229 3.6547e-05 deg
peri 150.9096022378485 3.9211e-05 deg
M 281.4763253198618 1.4993e-05 deg
tp 2459283.579837943762
(2021-Mar-10.07983794)
5.4503e-05 TDB
period 1297.80912667261
3.55
6.6221e-06
1.813e-08
d
yr
n .2773905596757409 1.4154e-09 deg/d
Q 2.622601414655318 8.9213e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1607  
   data-arc span      12688 days (34.74 yr)  
   first obs. used      1985-09-20  
   last obs. used      2020-06-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53323  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 18:53:14  

Additional Information
 Earth MOID = 1.03454 au 
 Jupiter MOID = 2.84654 au 
 T_jup = 3.555 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 15.0   n/a MPO467963  
diameter diameter 2.109 km 0.556 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.397   0.135 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

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

[ show close-approach data ]
Alternate Designations
 1999 RA132 = 1985 ST4 = 1991 HZ3 = 1998 HB19 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-Aug-11 11:32 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin