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5309 MacPherson (1981 ED25)
Classification: Main-belt Asteroid          SPK-ID: 2005309
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2346257334931378 4.5217e-08  
a 2.252060520547569 9.6755e-09 AU
q 1.723669169043158 1.0241e-07 AU
i 4.04378616845507 5.2041e-06 deg
node 202.19778251 6.9903e-05 deg
peri 125.3303423449622 7.0937e-05 deg
M 220.6640677923326 1.4127e-05 deg
tp 2457478.281290990989
(2016-Mar-30.78129099)
5.0512e-05 JED
period 1234.43581301343
3.38
7.9553e-06
2.178e-08
d
yr
n .2916312020478325 1.8794e-09 deg/d
Q 2.780451872051981 1.1946e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1111  
   data-arc span      13555 days (37.11 yr)  
   first obs. used      1978-05-09  
   last obs. used      2015-06-19  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .53059  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Jul-06 11:51:09  

Additional Information
 Earth MOID = .71708 AU 
 T_jup = 3.586 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.3 mag n/a MPO263395  

5309 MacPherson           Discovered 1981 Mar. 2 by S. J. Bus at Siding Spring in the course of the U.K. Schmidt-Caltech Asteroid Survey.
Glenn MacPherson (b. 1950), curator at the Smithsonian's National Museum of Natural History, has studied chondrules and Ca-Al-rich inclusions to investigate the nebular processes that formed chondritic meteorites. His work on short-lived isotopes has helped constrain the timing of these processes.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20020624/MPCPages.arcLast Updated: 2003-10-02

Alternate Designations
 1981 ED25 = 1975 NO1 = 1982 SD5 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
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