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19950 (1981 EP47)
Classification: Main-belt Asteroid          SPK-ID: 2019950
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 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1276353007693521 4.5874e-08  
a 3.06090505621285 2.2635e-08 au
q 2.670225518736693 1.3988e-07 au
i 11.62027542785531 4.9022e-06 deg
node 185.2601158325222 2.2882e-05 deg
peri 196.4327698131705 2.8813e-05 deg
M 311.4131089668153 2.0232e-05 deg
tp 2459464.491427661780
(2021-Sep-06.99142766)
0.00011171 TDB
period 1956.019657510726
5.36
2.1697e-05
5.94e-08
d
yr
n .1840472301071575 2.0415e-09 deg/d
Q 3.451584593689008 2.5524e-08 au
  Orbit Determination Parameters
   # obs. used (total)      839  
   data-arc span      14379 days (39.37 yr)  
   first obs. used      1981-02-12  
   last obs. used      2020-06-26  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .53796  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:10:12  

Additional Information
 Earth MOID = 1.67313 au 
 Jupiter MOID = 2.0146 au 
 T_jup = 3.190 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456833.5 (2014-Jun-25.0) TDB
Reference: JPL 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1314734625161071 4.5982e-08  
q 2.654442876092831 1.4102e-07 au
tp 2457514.859376599630
(2016-May-06.35937660)
9.8154e-05 TDB
node 185.5355323399786 2.2877e-05 deg
peri 196.996164770169 2.853e-05 deg
i 11.62626386469824 4.9099e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      839  
   data-arc span      14379 days (39.37 yr)  
   first obs. used      1981-02-12  
   last obs. used      2020-06-26  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .53796  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:10:12  

Additional Information
 Jupiter MOID = 2.0146 au 
 T_jup = 3.190 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.114322939152605E-15 -6.428028528275156E-15 6.430400007003008E-13 -7.580072227875922E-15 1.468805741254036E-13 -3.691792499391029E-16
q -6.428028528275156E-15 1.988577674245612E-14 -1.155091093938726E-12 2.227476368457606E-14 -3.296819374498077E-13 1.549761172321572E-15
tp 6.430400007003008E-13 -1.155091093938726E-12 9.634302979784797E-9 -1.560499034347728E-12 1.696763319471319E-9 1.916612437220168E-12
node -7.580072227875922E-15 2.227476368457606E-14 -1.560499034347728E-12 5.233512288814113E-10 -5.127403884885455E-10 2.853475671589503E-11
peri 1.468805741254036E-13 -3.296819374498077E-13 1.696763319471319E-9 -5.127403884885455E-10 8.139357676300446E-10 -2.768517919610172E-11
i -3.691792499391029E-16 1.549761172321572E-15 1.916612437220168E-12 2.853475671589503E-11 -2.768517919610172E-11 2.410737687126558E-11

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.29   n/a E2021B10  
diameter diameter 5.080 km 0.119 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.143   0.011 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

19950 (1981 EP47)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring
Reference: 20010109/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1981 EP47 = 1994 RB8 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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