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 ]  
20970 (1981 DD1)
Classification: Main-belt Asteroid          SPK-ID: 2020970
[ 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 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1219650818999444 9.1562e-08  
a 2.533241494908842 1.1567e-08 au
q 2.224274488509947 2.344e-07 au
i 14.51653253446931 8.8594e-06 deg
node 332.0619134137852 1.3767e-05 deg
peri 126.9883642009022 9.1266e-05 deg
M 331.0051292001401 8.1542e-05 deg
tp 2459119.112919011215
(2020-Sep-26.61291901)		 0.00033347 TDB
period 1472.696710352085
4.03		 1.0087e-05
2.762e-08		 d
yr
n .2444495173170672 1.6742e-09 deg/d
Q 2.842208501307737 1.2978e-08 au
   Orbit Determination Parameters
   # obs. used (total)      1128  
   data-arc span      14525 days (39.77 yr)  
   first obs. used      1981-02-09  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48677  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 03:15:19  

Additional Information
 Earth MOID = 1.26982 au 
 Jupiter MOID = 2.29882 au 
 T_jup = 3.395 
[ 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 14.9   n/a MPO395204  

20970 (1981 DD1)          Discovered 1981-Feb-28 by Bus, S. J. at Siding Spring
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1981 DD1 = 1999 RE207 
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-Jan-22 04:22 UT
(server date/time)   		NASA Home Page
Site Manager:   Ryan S. Park
Webmaster:   Alan B. Chamberlin