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
IMPORTANT: The SSD Announcement email list is now available. Major changes are coming in the near future, including possible hostname and/or URL changes. To be notified of such changes, subscribe to this email list.

Please visit this page for more details.


JPL Small-Body Database Browser
Search: [ help ]  
20984 (1981 EH33)
Classification: Main-belt Asteroid          SPK-ID: 2020984
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05596676158426525 3.9821e-08  
a 3.075431533256041 2.3397e-08 au
q 2.903309589865569 1.293e-07 au
i 9.759579337776737 5.0554e-06 deg
node 191.2798603523084 2.5506e-05 deg
peri 101.4752372650712 5.1505e-05 deg
M 268.3275880824391 4.4811e-05 deg
tp 2459102.141754879823
(2020-Sep-09.64175488)
0.00024564 TDB
period 1969.960514610853
5.39
2.248e-05
6.155e-08
d
yr
n .1827447795678862 2.0854e-09 deg/d
Q 3.247553476646512 2.4707e-08 au
  Orbit Determination Parameters
   # obs. used (total)      896  
   data-arc span      13961 days (38.22 yr)  
   first obs. used      1981-02-09  
   last obs. used      2019-05-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52146  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-12 23:48:05  

Additional Information
 Earth MOID = 1.90795 au 
 Jupiter MOID = 1.87753 au 
 T_jup = 3.205 
[ 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 14.2   n/a MPO474041  
diameter diameter 5.095 km 0.200 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.171   0.021 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20984 (1981 EH33)          Discovered 1981-Mar-01 by Bus, S. J. at Siding Spring
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1981 EH33 = 1998 KQ60 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-Jan-24 13:58 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin