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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1204205608284194 3.9666e-08  
a 3.10693131538442 1.8477e-08 au
q 2.732792903930449 1.2392e-07 au
i 9.941769025213956 4.0897e-06 deg
node 169.1425713628948 2.4688e-05 deg
peri 209.2314116724932 2.9754e-05 deg
M 210.3925683400431 1.8144e-05 deg
tp 2459831.778545975301
(2022-Sep-09.27854598)
0.00010455 TDB
period 2000.303549300263
5.48
1.7844e-05
4.885e-08
d
yr
n .1799726847087451 1.6055e-09 deg/d
Q 3.481069726838391 2.0702e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1398  
   data-arc span      14370 days (39.34 yr)  
   first obs. used      1981-02-12  
   last obs. used      2020-06-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54105  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 03:18:20  

Additional Information
 Earth MOID = 1.73862 au 
 Jupiter MOID = 1.99375 au 
 T_jup = 3.186 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457106.5 (2015-Mar-25.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1203060181328809 3.9729e-08  
q 2.733756741991054 1.241e-07 au
tp 2457834.677262169426
(2017-Mar-22.17726217)
9.6264e-05 TDB
node 169.1618990847348 2.4694e-05 deg
peri 209.9499072042655 2.9745e-05 deg
i 9.939867172145471 4.0891e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1398  
   data-arc span      14370 days (39.34 yr)  
   first obs. used      1981-02-12  
   last obs. used      2020-06-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54105  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 03:18:20  

Additional Information
 Jupiter MOID = 1.99375 au 
 T_jup = 3.186 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.578371266255531E-15 -4.887901455347047E-15 6.084911427155823E-13 -7.178790013378762E-15 1.088597273327498E-13 -1.891842858910266E-16
q -4.887901455347047E-15 1.540185957593254E-14 -1.295483273342801E-12 2.29736055175305E-14 -2.547492747668477E-13 1.361520127460856E-15
tp 6.084911427155823E-13 -1.295483273342801E-12 9.266675171318424E-9 -1.969634434196778E-11 1.620762044960521E-9 -1.483701966824636E-12
node -7.178790013378762E-15 2.29736055175305E-14 -1.969634434196778E-11 6.097909710534953E-10 -6.037847378383202E-10 2.19766011077064E-11
peri 1.088597273327498E-13 -2.547492747668477E-13 1.620762044960521E-9 -6.037847378383202E-10 8.847802103404152E-10 -2.196096280034565E-11
i -1.891842858910266E-16 1.361520127460856E-15 -1.483701966824636E-12 2.19766011077064E-11 -2.196096280034565E-11 1.672088003660787E-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 13.8   n/a MPO473886  
diameter diameter 7.569 km 0.197 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
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] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

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 ]
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