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18599 (1998 BK8)
Classification: Main-belt Asteroid          SPK-ID: 2018599
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.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09786839291644379 4.8115e-08  
a 2.280857186550672 7.2659e-09 au
q 2.057633359231037 1.0931e-07 au
i 3.560676032551799 3.5455e-06 deg
node 84.39066451492579 7.9178e-05 deg
peri 98.99475714129353 8.1089e-05 deg
M 134.975128895322 1.6985e-05 deg
tp 2458528.766393315383
(2019-Feb-14.26639332)
5.9561e-05 TDB
period 1258.188080992069
3.44
6.0121e-06
1.646e-08
d
yr
n .2861257433913566 1.3672e-09 deg/d
Q 2.504081013870308 7.977e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1399  
   data-arc span      9219 days (25.24 yr)  
   first obs. used      1995-05-05  
   last obs. used      2020-07-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50414  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-25 01:21:15  

Additional Information
 Earth MOID = 1.06313 au 
 Jupiter MOID = 2.45587 au 
 T_jup = 3.597 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456878.5 (2014-Aug-09.0) TDB
Reference: JPL 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09768609938534567 4.8069e-08  
q 2.057742218275754 1.0911e-07 au
tp 2457270.191580987227
(2015-Sep-04.69158099)
6.0604e-05 TDB
node 84.42364675539797 7.9112e-05 deg
peri 99.00626001674436 8.1038e-05 deg
i 3.562190476088129 3.5484e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1399  
   data-arc span      9219 days (25.24 yr)  
   first obs. used      1995-05-05  
   last obs. used      2020-07-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50414  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-25 01:21:15  

Additional Information
 Jupiter MOID = 2.45587 au 
 T_jup = 3.597 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.310654696611014E-15 -5.235874415670555E-15 6.332365802831195E-13 -2.873002129074929E-14 2.127097507465373E-13 -8.655380971905453E-16
q -5.235874415670555E-15 1.190578321838056E-14 -1.520419353180361E-12 6.533861375984387E-14 -5.111590439833345E-13 1.996676886186212E-15
tp 6.332365802831195E-13 -1.520419353180361E-12 3.672817151545E-9 -3.05201504379172E-12 1.092396499311937E-9 -7.709614309725507E-13
node -2.873002129074929E-14 6.533861375984387E-14 -3.05201504379172E-12 6.258694690052206E-9 -6.247196835204772E-9 -9.175864634845098E-11
peri 2.127097507465373E-13 -5.111590439833345E-13 1.092396499311937E-9 -6.247196835204772E-9 6.567084654171077E-9 9.135497538671776E-11
i -8.655380971905453E-16 1.996676886186212E-15 -7.709614309725507E-13 -9.175864634845098E-11 9.135497538671776E-11 1.259102614201466E-11

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 15.0   n/a MPO337415  
diameter diameter 2.814 km 0.838 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 10.644 h n/a LCDB (Rev. 2019-August); 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:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.169   0.117 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

18599 (1998 BK8)          Discovered 1998-Jan-25 by Kobayashi, T. at Oizumi
Reference: 20001111/Numbers.arcLast Updated: 2004-04-19

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Alternate Designations
 1998 BK8 = 1995 JR1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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