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6639 Marchis (1989 SO8)
Classification: Main-belt Asteroid          SPK-ID: 2006639
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 8 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1298135809334907 4.6266e-08  
a 3.176073569204541 3.5486e-08 AU
q 2.763776085877886 1.4354e-07 AU
i 2.520589740917556 5.8335e-06 deg
node 69.25879612876589 0.00013259 deg
peri 216.7878619317465 0.00013497 deg
M 223.3022675020293 2.6535e-05 deg
tp 2457785.542316411336
(2017-Feb-01.04231641)
0.00015397 JED
period 2067.446392443096
5.66
3.465e-05
9.487e-08
d
yr
n .1741278522702535 2.9183e-09 deg/d
Q 3.588371052531195 4.0093e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1249  
   data-arc span      13428 days (36.76 yr)  
   first obs. used      1977-06-12  
   last obs. used      2014-03-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .4984  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jun-16 13:35:00  

Additional Information
 Earth MOID = 1.74923 AU 
 T_jup = 3.186 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.6 mag n/a MPO256912  

6639 Marchis           Discovered 1989 Sept. 25 by H. Debehogne at La Silla.
Franck Marchis (b. 1973) exploited the high-resolution capabilities offered by adaptive optics from ground-based telescopes to survey hundreds of main-belt minor planets and Trojans. In 2004 he led the team that discovered (87) Sylvia II (Remus), the only case where a main-belt object is known to have a second satellite.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20070402/MPCPages.arcLast Updated: 2007-07-05

[ show close-approach data ]
Alternate Designations
 1989 SO8 = 1977 LZ 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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