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 ]  
20121 (1995 WT7)
Classification: Main-belt Asteroid          SPK-ID: 2020121
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1452236141354693 2.1196e-08  
a 2.671910923960106 1.1274e-08 au
q 2.283886362934578 5.5226e-08 au
i 12.68227952114699 6.113e-07 deg
node 75.08444680169386 3.7639e-06 deg
peri 95.20827200382571 9.8288e-06 deg
M 185.351294025758 1.0488e-05 deg
tp 2459974.416777331035
(2023-Jan-29.91677733)
4.918e-05 TDB
period 1595.259685922112
4.37
1.0097e-05
2.764e-08
d
yr
n .2256685874888817 1.4283e-09 deg/d
Q 3.059935484985633 1.2911e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1804  
   data-arc span      11986 days (32.82 yr)  
   first obs. used      1988-04-11  
   last obs. used      2021-02-03  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .45284  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:13:30  

Additional Information
 Earth MOID = 1.33049 au 
 Jupiter MOID = 2.04261 au 
 T_jup = 3.331 
[ 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 13.42   n/a E2021B10  
diameter diameter 5.333 km 0.113 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.327   0.040 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20121 (1995 WT7)          Discovered 1995-Nov-27 by Kobayashi, T. at Oizumi
Reference: 20010109/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1995 WT7 = 1988 GP1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-Apr-21 11:24 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin