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9549 Akplatonov (1985 SM2)
Classification: Main-belt Asteroid          SPK-ID: 2009549
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1085587732836941 3.8013e-08  
a 2.606658432195523 1.067e-08 au
q 2.323682790426779 9.8377e-08 au
i 11.15387368749295 4.1046e-06 deg
node 235.1917685041294 1.8291e-05 deg
peri 305.6097684189975 2.4594e-05 deg
M 183.9867865612488 1.6782e-05 deg
tp 2459352.066454546389
(2021-May-17.56645455)
7.2479e-05 TDB
period 1537.17961481824
4.21
9.4386e-06
2.584e-08
d
yr
n .2341951431892801 1.438e-09 deg/d
Q 2.889634073964266 1.1829e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2295  
   data-arc span      13941 days (38.17 yr)  
   first obs. used      1981-10-03  
   last obs. used      2019-12-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43228  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-13 22:53:07  

Additional Information
 Earth MOID = 1.34377 au 
 Jupiter MOID = 2.1479 au 
 T_jup = 3.377 
[ 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 12.5   n/a MPO416817  
diameter diameter 8.238 km 0.173 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 2.8431 h n/a LCDB (Rev. 2019-January); Warner et al., 2009 Published Reference List:
[Murphy, B.W.; Darragh, A.N.; Harp, T.W.; Liu, Z.J.; et al. (2011) Minor Planet Bull. 38, 139-140.]
geometric albedo albedo 0.285   0.044 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

9549 Akplatonov           Discovered 1985 Sept. 19 by N. S. Chernykh and L. I. Chernykh at the Crimean Astrophysical Observatory.
Aleksandr Konstantinovich Platonov (b. 1931), a researcher in astrodynamics and robotics at the Keldysh Institute of Applied Mathematics since 1954, is a pioneer in the theory and computation of satellite orbits and the control of spacecraft trajectories to the moon and planets, as well as the motion of walking robots.
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

[ show close-approach data ]
Alternate Designations
 1985 SM2 = 1981 TU1 = 1987 BP3 = 1992 JK3 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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