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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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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.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 251 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4493719362096769 3.0413e-08  
a 2.151223603796617 2.1818e-09 au
q 1.184524087738573 6.489e-08 au
i 8.442642745100823 3.4939e-06 deg
node 172.0560833660132 2.2693e-05 deg
peri 154.7610407942896 2.3504e-05 deg
M 164.3355923904403 6.1357e-06 deg
tp 2458674.415032367245
(2019-Jul-09.91503237)
1.9092e-05 TDB
period 1152.462382572755
3.16
1.7532e-06
4.8e-09
d
yr
n .3123746210234964 4.7521e-10 deg/d
Q 3.117923119854662 3.1622e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1369  
   data-arc span      14451 days (39.56 yr)  
   first obs. used      1981-08-21  
   last obs. used      2021-03-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .49037  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 14:41:44  

Additional Information
 Earth MOID = .182488 au 
 Jupiter MOID = 2.27883 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 16.15   n/a E2020-QM5  
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. 2020-October); 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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