Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
IMPORTANT: The SSD Announcement email list is now available. Major changes are coming in the near future, including possible hostname and/or URL changes. To be notified of such changes, subscribe to this email list.

Please visit this page for more details.


JPL Small-Body Database Browser
Search: [ help ]  
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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1737896626407999 4.4174e-08  
a 2.437603728514574 8.7131e-09 au
q 2.01397339888407 1.1033e-07 au
i 1.954972587411878 4.9618e-06 deg
node 309.0901469835544 0.00011094 deg
peri 345.6463048560762 0.00011164 deg
M 269.8576055074394 1.2505e-05 deg
tp 2458948.572469595963
(2020-Apr-09.07246960)
4.8369e-05 TDB
period 1390.090531319178
3.81
7.4532e-06
2.041e-08
d
yr
n .2589759385371574 1.3885e-09 deg/d
Q 2.861234058145077 1.0227e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1639  
   data-arc span      13965 days (38.23 yr)  
   first obs. used      1981-02-12  
   last obs. used      2019-05-09  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54508  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-30 01:31:29  

Additional Information
 Earth MOID = .997314 au 
 Jupiter MOID = 2.32981 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 14.4   n/a MPO431589  
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

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2019-Dec-11 19:53 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin