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 ]  
129442 (1981 EC15)
Classification: Main-belt Asteroid          SPK-ID: 2129442
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 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1856217512558354 4.9646e-08  
a 2.572483479478905 1.4609e-08 au
q 2.094974590941326 1.2926e-07 au
i 5.495798726418013 5.2545e-06 deg
node 337.7297755243332 3.7138e-05 deg
peri 191.5308156213163 3.8416e-05 deg
M 189.7830156816398 9.7296e-06 deg
tp 2459713.070288074914
(2022-May-13.57028807)
4.3433e-05 TDB
period 1507.048810283142
4.13
1.2838e-05
3.515e-08
d
yr
n .2388774653770927 2.0349e-09 deg/d
Q 3.049992368016484 1.7321e-08 au
  Orbit Determination Parameters
   # obs. used (total)      491  
   data-arc span      14134 days (38.70 yr)  
   first obs. used      1981-02-12  
   last obs. used      2019-10-25  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .58614  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-07 15:17:00  

Additional Information
 Earth MOID = 1.10181 au 
 Jupiter MOID = 1.92824 au 
 T_jup = 3.398 
[ 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 15.8   n/a MPO436627  
diameter diameter 2.097 km 0.236 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 15.67 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Binzel, R.P.; Xu, S.; Bus, S.J.; Bowell, E. (1992) Icarus 99, 225-237; Science 257, 779-782.]
geometric albedo albedo 0.119   0.043 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

129442 (1981 EC15)          Discovered 1981-Mar-01 by Bus, S. J. at Siding Spring
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-22 09:59 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin