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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 247 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4493181919863922 3.0431e-08  
a 2.151154456106275 2.1876e-09 au
q 1.184601625205133 6.4928e-08 au
i 8.441614203518899 3.5788e-06 deg
node 172.0638468082656 2.3928e-05 deg
peri 154.7422022385686 2.485e-05 deg
M 101.8877451727952 6.2372e-06 deg
tp 2458674.344077514654
(2019-Jul-09.84407751)
1.9626e-05 TDB
period 1152.406816890434
3.16
1.7579e-06
4.813e-09
d
yr
n .3123896828130506 4.7653e-10 deg/d
Q 3.117707287007418 3.1706e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1350  
   data-arc span      14388 days (39.39 yr)  
   first obs. used      1981-08-21  
   last obs. used      2021-01-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49099  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jan-12 05:24:29  

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. 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

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1921-Aug-28 04:22 < 00:01 Earth 0.341375489703877 0.341372915003141 0.341378064404923 9.2667221176338 9.26587980440978 2422929.682107898 0.0911570468860821 129.406732747184 13.2973387151052 -7.28161699735626 455541.299987758 T 247 CATAB v2.0f-lin.ifort 2021-Jan-12 05:24:33 2021-Jan-12 05:24
1940-Aug-23 23:56 < 00:01 Earth 0.22040574380923 0.220404608040669 0.220406879578079 5.48150331033166 5.47929745431776 2429865.497378198 0.0507806707693355 58.0616899612015 11.6380618543748 13.0424208894054 713066.038401945 T 247 CATAB v2.0f-lin.ifort 2021-Jan-12 05:24:33 2021-Jan-12 05:24
1981-Aug-25 20:23 < 00:01 Earth 0.198843853811555 0.198843485561441 0.198844222061793 6.12754091766557 6.12535370263186 2444842.349265864 0.0485752881120572 21.3118139588758 12.8963645728312 -39.6456346488535 1293034.77416957 T 247 CATAB v2.0f-lin.ifort 2021-Jan-12 05:24:33 2021-Jan-12 05:24
1994-Jun-09 02:04 < 00:01 Mars 0.0939075188967737 0.0939072606833924 0.0939077771105927 8.13425635955951 8.1338815609505 2449512.586426393 0.116223954914603 23.6090437285053 11.0778226805524 -71.6508981598661 1212610.69694516 T 247 CATAB v2.0f-lin.ifort 2021-Jan-12 05:24:33 2021-Jan-12 05:24
2000-Aug-29 07:59 < 00:01 Earth 0.370270051384135 0.37026960880774 0.370270493960551 6.42315118942548 6.42203076258093 2451785.832658301 0.140950673426792 22.157214626556 11.7781111468734 -5.79952301161347 2070371.88644814 T 247 CATAB v2.0f-lin.ifort 2021-Jan-12 05:24:33 2021-Jan-12 05:24
2022-Aug-29 05:43 < 00:01 Earth 0.331822281067994 0.331821646976212 0.331822915159926 9.08516332694597 9.0842794430942 2459820.738029402 0.104370674307072 33.8763762467411 11.6572260716683 -22.5071544054027 1236100.60732736 T 247 CATAB v2.0f-lin.ifort 2021-Jan-12 05:24:33 2021-Jan-12 05:24
2041-Aug-25 11:49 < 00:01 Earth 0.218731261117051 0.218730492604133 0.218732029630056 5.51066664674899 5.50845566839065 2466756.992363731 0.0482806499636297 39.0766081074365 11.6535782867396 11.8347022724423 956389.810525822 T 247 CATAB v2.0f-lin.ifort 2021-Jan-12 05:24:33 2021-Jan-12 05:24
2082-Aug-27 05:39 < 00:01 Earth 0.196608668881949 0.196607912391944 0.19660942537468 6.20534098417 6.20315664291837 2481733.735438569 0.0707121489928593 53.8075920416656 11.6361916814051 -46.9569609224233 1139903.13545556 T 247 CATAB v2.0f-lin.ifort 2021-Jan-12 05:24:33 2021-Jan-12 05:24
2101-Aug-31 00:40 < 00:01 Earth 0.372967823559145 0.372964986733814 0.372970660384582 6.63627620131454 6.63519960778238 2488676.527929615 0.346183965917752 141.798537584574 11.3119653166173 -3.96249179187541 519100.320048791 T 247 CATAB v2.0f-lin.ifort 2021-Jan-12 05:24:33 2021-Jan-12 05:24
2123-Aug-31 15:54 < 00:01 Earth 0.349942459161818 0.349939096479714 0.349945821844737 9.38426062241567 9.38344922348228 2496712.162820604 0.147591534608943 169.803447284847 12.866696732455 -9.13965105126347 496293.919979219 T 247 CATAB v2.0f-lin.ifort 2021-Jan-12 05:24:33 2021-Jan-12 05:24
2142-Aug-27 16:10 < 00:01 Earth 0.210339814554195 0.210337766829929 0.210341862280314 5.58246448942864 5.58019486919898 2503648.173566105 0.0461263673198021 106.810571986492 11.1270800605006 17.174649843085 829713.254186148 T 247 CATAB v2.0f-lin.ifort 2021-Jan-12 05:24:33 2021-Jan-12 05:24
2183-Aug-29 08:26 < 00:01 Earth 0.197704840429324 0.197703109996534 0.197706570875095 6.18193000502877 6.17974954781685 2518624.851271566 0.0935885089910517 118.116302352611 11.9259218271056 -43.3805450607498 1067524.09487733 T 247 CATAB v2.0f-lin.ifort 2021-Jan-12 05:24:33 2021-Jan-12 05:24
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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