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8802 Negley (1981 EW31)
Classification: Main-belt Asteroid          SPK-ID: 2008802
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1204205567307427 4.107e-08  
a 3.106931312494829 1.9681e-08 au
q 2.732792914120025 1.2692e-07 au
i 9.941766786258396 4.5928e-06 deg
node 169.1425912103031 2.6629e-05 deg
peri 209.2313545022287 3.2979e-05 deg
M 210.3926016973286 1.9511e-05 deg
tp 2459831.778359469231
0.00011097 TDB
period 2000.3035465097
n .1799726849598195 1.71e-09 deg/d
Q 3.481069710869634 2.2051e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1229  
   data-arc span      13930 days (38.14 yr)  
   first obs. used      1981-02-12  
   last obs. used      2019-04-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .55744  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-12 18:58:11  

Additional Information
 Earth MOID = 1.73862 au 
 Jupiter MOID = 1.99375 au 
 T_jup = 3.186 
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Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.8   n/a MPO473886  
diameter diameter 7.569 km 0.197 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 5.764 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:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.123   0.012 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  

8802 Negley           Discovered 1981 Mar. 2 by S. J. Bus at Siding Spring.
Scott Negley, Jr. (b. 1939) is a long-time educator of astronomy. Through his work as a high school planetarium director, he motivated several students to actively pursue a career in astronomy and physics.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: MPC batch dated 2015-12-25Last Updated: 2016-01-04

Alternate Designations
 1981 EW31 = 1989 SW1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
FirstGov 2020-Feb-22 10:39 UT
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