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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1082510009756756 3.769e-08  
a 2.607428062138605 1.0541e-08 au
q 2.325171364440035 9.7753e-08 au
i 11.15232455164398 4.1014e-06 deg
node 235.19291752935 1.7833e-05 deg
peri 305.5196822048263 2.4226e-05 deg
M 277.7210256316648 1.6885e-05 deg
tp 2459351.982169538525
(2021-May-17.48216954)
7.2576e-05 TDB
period 1537.860455909684
4.21
9.3252e-06
2.553e-08
d
yr
n .2340914603900461 1.4195e-09 deg/d
Q 2.889684759837176 1.1682e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2373  
   data-arc span      14004 days (38.34 yr)  
   first obs. used      1981-10-03  
   last obs. used      2020-02-05  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42436  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 19:22:05  

Additional Information
 Earth MOID = 1.34495 au 
 Jupiter MOID = 2.14693 au 
 T_jup = 3.376 
[ 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-August); 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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