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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 42 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1081634068495677 1.0978e-08  
a 2.607535590324151 9.0608e-09 au
q 2.325495657393192 3.1067e-08 au
i 11.15143960102473 6.4771e-07 deg
node 235.1867412800235 9.0185e-07 deg
peri 305.4779570131544 8.0933e-06 deg
M 324.5726280760656 9.1691e-06 deg
tp 2459351.849234956926
(2021-May-17.34923496)
3.9206e-05 TDB
period 1537.95558703815
4.21
8.0163e-06
2.195e-08
d
yr
n .2340769805279624 1.2201e-09 deg/d
Q 2.889575523255109 1.0041e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2865  
   data-arc span      14416 days (39.47 yr)  
   first obs. used      1981-10-03  
   last obs. used      2021-03-23  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .40836  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-04 00:19:36  

Additional Information
 Earth MOID = 1.3447 au 
 Jupiter MOID = 2.14599 au 
 T_jup = 3.376 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.61   n/a E2021B10  
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. 2020-October); 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

Alternate Designations
 1985 SM2 = 1981 TU1 = 1987 BP3 = 1992 JK3 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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