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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 | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .01064959871246411 1.4119e-08  
a 2.376616265039032 7.6923e-09 au
q 2.351306255522851 3.3296e-08 au
i 4.627824987713164 1.3091e-06 deg
node 51.331570676563 1.0279e-05 deg
peri 355.7891745697115 9.6713e-05 deg
M 164.0337826322049 9.2456e-05 deg
tp 2458590.727515187741
(2019-Apr-17.22751519)
0.00034413 TDB
period 1338.249298466857
3.66
6.4972e-06
1.779e-08
d
yr
n .2690081738973657 1.306e-09 deg/d
Q 2.401926274555213 7.7742e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3642  
   data-arc span      24996 days (68.44 yr)  
   first obs. used      1952-09-20  
   last obs. used      2021-02-26  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .3736  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 16:09:09  

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 | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.42   n/a E2020-QM5  
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

[ show close-approach data ]
Alternate Designations
 1985 PF2 = 1969 EM1 = 1978 TQ9 = 1982 VQ12 = 1989 UX3 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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