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100715 (1998 BK21)
Classification: Main-belt Asteroid          SPK-ID: 2100715
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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09852640696201456 4.2452e-08  
a 2.807190962965845 1.4973e-08 au
q 2.530608523728583 1.2046e-07 au
i .4140598599586092 4.9358e-06 deg
node 15.20015465743275 0.00059473 deg
peri 358.8746562673794 0.00059515 deg
M 4.533616442253809 2.2397e-05 deg
tp 2458978.865411632118
(2020-May-09.36541163)
0.00010686 TDB
period 1717.933555174249
4.70
1.3744e-05
3.763e-08
d
yr
n .2095540883497589 1.6766e-09 deg/d
Q 3.083773402203108 1.6448e-08 au
  Orbit Determination Parameters
   # obs. used (total)      491  
   data-arc span      8332 days (22.81 yr)  
   first obs. used      1998-01-22  
   last obs. used      2020-11-14  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .55936  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-17 22:28:26  

Additional Information
 Earth MOID = 1.53116 au 
 Jupiter MOID = 2.38063 au 
 T_jup = 3.315 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457090.5 (2015-Mar-09.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .101301436186836 4.2984e-08  
q 2.523281797678688 1.2242e-07 au
tp 2457253.973937812897
(2015-Aug-19.47393781)
0.00010173 TDB
node 15.55571810698182 0.00058773 deg
peri 357.366069756319 0.00058813 deg
i .4186317188354028 4.9424e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      491  
   data-arc span      8332 days (22.81 yr)  
   first obs. used      1998-01-22  
   last obs. used      2020-11-14  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .55936  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-17 22:28:26  

Additional Information
 Jupiter MOID = 2.38063 au 
 T_jup = 3.315 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.847592423738236E-15 -5.230172687466518E-15 -4.758159060544816E-13 6.264664331224865E-15 -1.271262312535455E-13 -8.076861668300186E-17
q -5.230172687466518E-15 1.498675113750207E-14 1.31860949566716E-12 -2.537327886047665E-14 3.559475893076944E-13 2.868077009292576E-16
tp -4.758159060544816E-13 1.31860949566716E-12 1.034894075323057E-8 -1.474450369668717E-11 2.225087871686376E-9 7.408027588069637E-14
node 6.264664331224865E-15 -2.537327886047665E-14 -1.474450369668717E-11 3.454309555847571E-7 -3.454238363211208E-7 -3.827767349124884E-10
peri -1.271262312535455E-13 3.559475893076944E-13 2.225087871686376E-9 -3.454238363211208E-7 3.458999194848342E-7 3.827794160719062E-10
i -8.076861668300186E-17 2.868077009292576E-16 7.408027588069637E-14 -3.827767349124884E-10 3.827794160719062E-10 2.442695828207063E-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 15.9   n/a MPO417508  
diameter diameter 3.988 km 0.254 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.040   0.009 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

100715 (1998 BK21)          Discovered 1998-Jan-22 by Spacewatch at Kitt Peak
Reference: 20051019/Numbers.arcLast Updated: 2005-10-26

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Alternate Designations
 1998 BK21 = 2001 UU114 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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