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4280 Simonenko (1985 PF2)
Classification: Main-belt Asteroid          SPK-ID: 2004280
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 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .01064959872048143 1.4119e-08  
a 2.376616265003507 7.6883e-09 au
q 2.35130625546865 3.3295e-08 au
i 4.62782498686789 1.309e-06 deg
node 51.33157065528388 1.0279e-05 deg
peri 355.7891749330078 9.667e-05 deg
M 164.0337823018174 9.2415e-05 deg
tp 2458590.727516429583
(2019-Apr-17.22751643)
0.00034398 TDB
period 1338.249298436851
3.66
6.4938e-06
1.778e-08
d
yr
n .2690081739033974 1.3053e-09 deg/d
Q 2.401926274538363 7.7702e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3649  
   data-arc span      25020 days (68.50 yr)  
   first obs. used      1952-09-20  
   last obs. used      2021-03-22  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .37329  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 21:31:32  

Additional Information
 Earth MOID = 1.35714 au 
 Jupiter MOID = 2.59961 au 
 T_jup = 3.537 
[ 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 13.43   n/a MPCxxxxx  
diameter diameter 5.942 km 0.214 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 507.583 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
geometric albedo albedo 0.262   0.106 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
SMASSII spectral type spec_B S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

4280 Simonenko (1985 PF2)          Discovered 1985-Aug-13 by Chernykh, N. S. at Nauchnyj
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1985 PF2 = 1969 EM1 = 1978 TQ9 = 1982 VQ12 = 1989 UX3 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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