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JPL Small-Body Database Browser
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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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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.

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Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1085587675869638 3.9096e-08  
a 2.606658429643442 1.1336e-08 au
q 2.32368280300118 1.0047e-07 au
i 11.15387356700339 4.109e-06 deg
node 235.1917649473257 1.9569e-05 deg
peri 305.6097749815481 2.5946e-05 deg
M 183.9867845731429 1.7032e-05 deg
tp 2459352.066461931743
7.3275e-05 TDB
period 1537.179612560748
n .2341951435332175 1.5278e-09 deg/d
Q 2.889634056285705 1.2567e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2085  
   data-arc span      13859 days (37.94 yr)  
   first obs. used      1981-10-03  
   last obs. used      2019-09-13  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44917  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Sep-24 01:04:27  

Additional Information
 Earth MOID = 1.34377 au 
 Jupiter MOID = 2.1479 au 
 T_jup = 3.377 
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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] (  
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] (  

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

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Alternate Designations
 1985 SM2 = 1981 TU1 = 1987 BP3 = 1992 JK3 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
FirstGov 2019-Oct-22 00:01 UT
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