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3102 Krok (1981 QA)
Classification: Amor [NEO]          SPK-ID: 2003102
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 246 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4493181918829107 3.0432e-08  
a 2.151154456127954 2.188e-09 au
q 1.184601625439675 6.4931e-08 au
i 8.441614250978535 3.584e-06 deg
node 172.063847207065 2.3987e-05 deg
peri 154.7422018221563 2.4916e-05 deg
M 101.8877451961817 6.2457e-06 deg
tp 2458674.344077434860
(2019-Jul-09.84407743)
1.9653e-05 TDB
period 1152.406816907854
3.16
1.7582e-06
4.814e-09
d
yr
n .3123896828083284 4.7661e-10 deg/d
Q 3.117707286816232 3.1711e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1346  
   data-arc span      14112 days (38.64 yr)  
   first obs. used      1981-08-21  
   last obs. used      2020-04-10  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48971  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:03:10  

Additional Information
 Earth MOID = .184359 au 
 Jupiter MOID = 2.27867 au 
 T_jup = 3.555 
[ 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 16.2   n/a MPO502183  
diameter diameter 1.6 km n/a Hazards due to Comets and Asteroids (1994), Ed. T. Gehrels, pp.540-543 based on assumed medium albedo (0.15)
rotation period rot_per 149.4 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Harris, A.W.; Young, J.W.; Dockweiler, T.; Gibson, J.; et al. (1992) Icarus 95, 115-147.]
[Pravec, P.; et al. (2005) Icarus 173, 108-131.]
B-V BV 0.834   0.021 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=24.29, mean=24.39, max.=24.49) deg.
U-B UB 0.521   0.056 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=24.29, mean=24.39, max.=24.49) deg.
Tholen spectral type spec_T QRS   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices
SMASSII spectral type spec_B S   n/a Binzel et al. (2004) Icarus 170, 259-294  

3102 Krok (1981 QA)          Discovered 1981-Aug-21 by Brozek, L. at Klet
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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