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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.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1738761602436332 4.3496e-08  
a 2.438387630702272 8.674e-09 au
q 2.014410152290191 1.0874e-07 au
i 1.955296276205623 4.8636e-06 deg
node 309.0740454391994 0.00010996 deg
peri 345.4782758171991 0.00011067 deg
M 13.57168233963055 1.2442e-05 deg
tp 2458948.069532282151
(2020-Apr-08.56953228)
4.8051e-05 TDB
period 1390.761138234785
3.81
7.421e-06
2.032e-08
d
yr
n .2588510637110035 1.3812e-09 deg/d
Q 2.862365109114354 1.0182e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1713  
   data-arc span      14363 days (39.32 yr)  
   first obs. used      1981-02-12  
   last obs. used      2020-06-10  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54762  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 16:44:46  

Additional Information
 Earth MOID = .998443 au 
 Jupiter MOID = 2.32949 au 
 T_jup = 3.481 
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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 14.5   n/a MPO473874  
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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