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 ]  
20988 (1981 EC43)
Classification: Main-belt Asteroid          SPK-ID: 2020988
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 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1910341325331657 3.5347e-08  
a 2.288964802128326 7.5525e-09 au
q 1.851694396754792 8.1444e-08 au
i 5.098640239574618 3.8596e-06 deg
node 188.5770899679433 3.891e-05 deg
peri 132.8168750098238 3.9889e-05 deg
M 352.7789374248276 1.044e-05 deg
tp 2459025.872058629763
(2020-Jun-25.37205863)
3.6754e-05 TDB
period 1264.902638860823
3.46
6.2604e-06
1.714e-08
d
yr
n .2846068850992498 1.4086e-09 deg/d
Q 2.72623520750186 8.9953e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1656  
   data-arc span      14362 days (39.32 yr)  
   first obs. used      1981-02-12  
   last obs. used      2020-06-09  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51839  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 18:47:38  

Additional Information
 Earth MOID = .843955 au 
 Jupiter MOID = 2.60568 au 
 T_jup = 3.570 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456592.5 (2013-Oct-27.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1907781092546467 3.528e-08  
q 1.851873352142362 8.1257e-08 au
tp 2456494.909765543954
(2013-Jul-21.40976554)
3.1551e-05 TDB
node 188.7137124082225 3.9001e-05 deg
peri 132.385634532496 3.9973e-05 deg
i 5.091907747355207 3.8557e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1656  
   data-arc span      14362 days (39.32 yr)  
   first obs. used      1981-02-12  
   last obs. used      2020-06-09  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51839  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 18:47:38  

Additional Information
 Jupiter MOID = 2.60568 au 
 T_jup = 3.570 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.244653178216215E-15 -2.858784395832565E-15 9.72205588649426E-14 -1.149565293888944E-14 4.972869747478381E-14 -6.525879787240519E-16
q -2.858784395832565E-15 6.602778926121096E-15 -1.696491101337831E-13 2.58693547599871E-14 -1.0027073152668E-13 1.54289960050625E-15
tp 9.72205588649426E-14 -1.696491101337831E-13 9.954563152710458E-10 -4.11706571849072E-12 2.862606703345074E-10 -7.889635261210378E-13
node -1.149565293888944E-14 2.58693547599871E-14 -4.11706571849072E-12 1.521081436831899E-9 -1.5159280770572E-9 -2.656497153506372E-11
peri 4.972869747478381E-14 -1.0027073152668E-13 2.862606703345074E-10 -1.5159280770572E-9 1.59780919492564E-9 2.622906413335653E-11
i -6.525879787240519E-16 1.54289960050625E-15 -7.889635261210378E-13 -2.656497153506372E-11 2.622906413335653E-11 1.4866052907892E-11

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 14.8   n/a MPO474041  

20988 (1981 EC43)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

[ 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-Aug-09 11:53 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin