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16868 (1998 AK8)
Classification: Mars-crossing Asteroid          SPK-ID: 2016868
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1821884890379277 7.8662e-08  
a 1.797727225595962 5.1717e-09 au
q 1.470202018662288 1.4007e-07 au
i 48.23457651682882 8.6985e-06 deg
node 126.7826256111436 7.4567e-06 deg
peri 11.90400479685841 2.1756e-05 deg
M 257.1248304072789 2.1396e-05 deg
tp 2459648.089309805825
(2022-Mar-09.58930981)
5.3054e-05 TDB
period 880.4082840268346
2.41
3.7992e-06
1.04e-08
d
yr
n .408901195651434 1.7645e-09 deg/d
Q 2.125252432529636 6.114e-09 au
  Orbit Determination Parameters
   # obs. used (total)      432  
   data-arc span      15741 days (43.10 yr)  
   first obs. used      1977-07-17  
   last obs. used      2020-08-21  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46215  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 17:44:18  

Additional Information
 Earth MOID = .490238 au 
 Jupiter MOID = 2.95872 au 
 T_jup = 3.664 
[ 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 16.64   n/a E2021B10  
diameter diameter 1.112 km 0.172 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)  
geometric albedo albedo 0.327   0.146 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)  

16868 (1998 AK8)          Discovered 1998-Jan-09 by ODAS at Caussols
Reference: 20000913/Numbers.arcLast Updated: 2004-04-19

[ 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
1916-Jan-28 12:07 < 00:01 Earth 0.495382416549658 0.495381660490701 0.495383172701934 23.5400132732249 23.5397847832375 2420891.004803363 0.0391228826924445 413.671655998864 21.4138354076986 -85.6919766548271 3499431.74258558 T 17 CATAB v2.0g-lin.ifort 2021-Jul-08 17:44:20 2021-Jul-08 17:44
2010-Jan-28 01:22 < 00:01 Earth 0.492062020341694 0.492061603057138 0.492062437626279 23.4588890719464 23.4586582446279 2455224.557101457 0.0307918988421056 40.077077927487 20.3621756585999 -82.8676317289739 3654308.61288421 T 17 CATAB v2.0g-lin.ifort 2021-Jul-08 17:44:20 2021-Jul-08 17:44
2051-Jan-28 17:01 < 00:01 Earth 0.491286315795643 0.491285752391441 0.491286879213138 23.5223152236608 23.5220846552787 2470200.209158786 0.0340990991785542 196.406266638596 21.2156001241 -84.5873665369506 3499979.28417601 T 17 CATAB v2.0g-lin.ifort 2021-Jul-08 17:44:20 2021-Jul-08 17:44
2145-Jan-29 06:51 < 00:01 Earth 0.491988293843516 0.491987315464539 0.491989272542875 23.4583220467457 23.4580911792563 2504533.785247049 0.0432380936238392 691.373449911667 20.4666059809511 86.324940545731 3668452.71355107 T 17 CATAB v2.0g-lin.ifort 2021-Jul-08 17:44:20 2021-Jul-08 17:44
2186-Jan-29 21:47 < 00:01 Earth 0.488687557511833 0.48868669726592 0.488688418172983 23.5065256585773 23.5062937083651 2519509.407293751 0.0482647325290031 816.079885038844 21.0311379952933 -87.3724460644407 3532305.95444818 T 17 CATAB v2.0g-lin.ifort 2021-Jul-08 17:44:20 2021-Jul-08 17:44
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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