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7861 Messenger (1981 EK25)
Classification: Main-belt Asteroid          SPK-ID: 2007861
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1736397543355195 3.594e-08  
a 2.437593045140904 6.3186e-09 au
q 2.014329987612666 8.7595e-08 au
i 1.95534852216829 4.1687e-06 deg
node 309.0740400738145 0.00010201 deg
peri 345.4243593547822 0.00010275 deg
M 65.41541939179901 1.2127e-05 deg
tp 2458947.909007516302
(2020-Apr-08.40900752)		 4.6918e-05 TDB
period 1390.081392729422
3.81		 5.4049e-06
1.48e-08		 d
yr
n .2589776410812469 1.007e-09 deg/d
Q 2.860856102669141 7.4157e-09 au
   Orbit Determination Parameters
   # obs. used (total)      2207  
   data-arc span      14610 days (40.00 yr)  
   first obs. used      1981-02-12  
   last obs. used      2021-02-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .50407  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 20:06:23  

Additional Information
 Earth MOID = .996391 au 
 Jupiter MOID = 2.32997 au 
 T_jup = 3.482 
[ show covariance matrix ]

[ 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 14.52   n/a E2021B10  
diameter diameter 2.822 km 0.438 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.321   0.101 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

7861 Messenger           Discovered 1981 Mar. 2 by S. J. Bus at Siding Spring in the course of the U.K. Schmidt-Caltech Asteroid Survey.
Scott R. Messenger (b. 1969) is a space scientist at NASA's Johnson Space Center. He pioneered research on the identification of pre-solar molecular cloud material in interplanetary dust particles.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20060809/MPCPages.arcLast Updated: 2007-08-08

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