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 ]  
129587 (1997 TH21)
Classification: Main-belt Asteroid          SPK-ID: 2129587
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 12 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1599448945366558 4.356e-08  
a 2.34617908735855 1.094e-08 au
q 1.970919720666879 9.9761e-08 au
i 3.246325898994929 4.9241e-06 deg
node 17.43129050514782 8.6309e-05 deg
peri 56.46953043486312 8.9385e-05 deg
M 71.83371269133525 1.8916e-05 deg
tp 2458738.581618431262
(2019-Sep-12.08161843)
6.9036e-05 TDB
period 1312.623472072317
3.59
9.1809e-06
2.514e-08
d
yr
n .2742599135696138 1.9183e-09 deg/d
Q 2.72143845405022 1.269e-08 au
  Orbit Determination Parameters
   # obs. used (total)      362  
   data-arc span      8157 days (22.33 yr)  
   first obs. used      1997-10-04  
   last obs. used      2020-02-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .55589  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-24 07:05:04  

Additional Information
 Earth MOID = .987938 au 
 Jupiter MOID = 2.53975 au 
 T_jup = 3.541 
[ 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 17.3   n/a MPO453774  

129587 (1997 TH21)          Discovered 1997-Oct-04 by Spacewatch at Kitt Peak
Reference: 20060711/Numbers.arcLast Updated: 2006-07-17

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-Oct-31 06:16 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin