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20804 Etter (2000 SW209)
Classification: Main-belt Asteroid          SPK-ID: 2020804
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.


Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 41 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1776219101507781 3.5096e-08  
a 2.420011421350848 8.3424e-09 au
q 1.990164370103811 8.2448e-08 au
i 10.92003112301175 3.3301e-06 deg
node 150.2724651136887 1.7549e-05 deg
peri 183.4915376149655 1.9956e-05 deg
M 211.8206220637536 1.0973e-05 deg
tp 2459962.491379843257
(2023-Jan-17.99137984)
4.3278e-05 TDB
period 1375.069186963641
3.76
7.1103e-06
1.947e-08
d
yr
n .2618050083682946 1.3538e-09 deg/d
Q 2.849858472597885 9.8242e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2000  
   data-arc span      14498 days (39.69 yr)  
   first obs. used      1981-09-03  
   last obs. used      2021-05-14  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .50387  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 18:27:36  

Additional Information
 Earth MOID = .979259 au 
 Jupiter MOID = 2.52522 au 
 T_jup = 3.468 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.42   n/a MPCxxxxx  
diameter diameter 7.540 km 0.212 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.065   0.015 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20804 Etter           Discovered 2000 Sept. 25 by the LINEAR Team at the Experimental Test Site.
Dolores M. Etter is renowned for lifetime achievement in digital signal processing and contributions to science education.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20010804/MPCPages.arcLast Updated: 2009-05-11

Alternate Designations
 2000 SW209 = 1981 RJ7 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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