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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1736397493863122 3.6355e-08  
a 2.437593040715584 6.3475e-09 au
q 2.014329996019911 8.8545e-08 au
i 1.95534860350594 4.1809e-06 deg
node 309.0740384943005 0.0001024 deg
peri 345.4243609520597 0.00010314 deg
M 65.41542012883394 1.2133e-05 deg
tp 2458947.909005358210
(2020-Apr-08.40900536)
4.6942e-05 TDB
period 1390.081388943995
3.81
5.4297e-06
1.487e-08
d
yr
n .2589776417864869 1.0116e-09 deg/d
Q 2.860856085411257 7.4497e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2180  
   data-arc span      14579 days (39.92 yr)  
   first obs. used      1981-02-12  
   last obs. used      2021-01-12  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50544  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 01:39:51  

Additional Information
 Earth MOID = .996391 au 
 Jupiter MOID = 2.32997 au 
 T_jup = 3.482 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457056.5 (2015-Feb-03.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1729192371088542 3.6303e-08  
q 2.017677608714561 8.8298e-08 au
tp 2457557.677852124741
(2016-Jun-18.17785212)
4.8075e-05 TDB
node 309.1362742612513 0.00010235 deg
peri 345.4003988192044 0.00010309 deg
i 1.955243020577095 4.1797e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2180  
   data-arc span      14579 days (39.92 yr)  
   first obs. used      1981-02-12  
   last obs. used      2021-01-12  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50544  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 01:39:51  

Additional Information
 Jupiter MOID = 2.32997 au 
 T_jup = 3.482 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.317898756012747E-15 -3.199741594816654E-15 1.010028360812762E-12 3.998581669702023E-15 2.32920858455351E-13 -7.117440543618261E-16
q -3.199741594816654E-15 7.796604788353527E-15 -2.515979794983159E-12 -1.075877343687127E-14 -5.842243580393306E-13 1.745239619084064E-15
tp 1.010028360812762E-12 -2.515979794983159E-12 2.311194893384651E-9 6.292635047341128E-12 6.047109353642899E-10 -1.187162695138965E-12
node 3.998581669702023E-15 -1.075877343687127E-14 6.292635047341128E-12 1.04745466810364E-8 -1.046683080472822E-8 2.195842265101114E-10
peri 2.32920858455351E-13 -5.842243580393306E-13 6.047109353642899E-10 -1.046683080472822E-8 1.062740858753766E-8 -2.197830016500169E-10
i -7.117440543618261E-16 1.745239619084064E-15 -1.187162695138965E-12 2.195842265101114E-10 -2.197830016500169E-10 1.746959147191128E-11

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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Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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