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450894 (2008 BT18)
Classification: Apollo [NEO, PHA]          SPK-ID: 2450894
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 105 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .5932555775811869 1.5219e-08  
a 2.221917854010371 2.5426e-09 au
q .9037526941914972 3.4317e-08 au
i 8.135297131750137 5.5894e-06 deg
node 107.6233101389568 1.7566e-05 deg
peri 139.3536524702196 1.8111e-05 deg
M 222.0821492254497 3.0184e-06 deg
tp 2459463.955888931625
(2021-Sep-06.45588893)
1.0875e-05 TDB
period 1209.735498910286
3.31
2.0765e-06
5.685e-09
d
yr
n .2975857121860799 5.1081e-10 deg/d
Q 3.540083013829245 4.051e-09 au
  Orbit Determination Parameters
   # obs. used (total)      424  
   # delay obs. used      2  
   # Doppler obs. used      1  
   data-arc span      23221 days (63.58 yr)  
   first obs. used      1955-03-14  
   last obs. used      2018-10-10  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46461  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-21 06:19:22  

Additional Information
 Earth MOID = .0106433 au 
 Jupiter MOID = 1.54727 au 
 T_jup = 3.383 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456876.5 (2014-Aug-07.0) TDB
Reference: JPL 105 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .5930877520377489 1.5234e-08  
q .904442588011281 3.4404e-08 au
tp 2457044.420516420612
(2015-Jan-21.92051642)
7.2962e-06 TDB
node 107.6894243937594 1.7562e-05 deg
peri 139.2525934160638 1.8113e-05 deg
i 8.131234919438924 5.5871e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      424  
   # delay obs. used      2  
   # Doppler obs. used      1  
   data-arc span      23221 days (63.58 yr)  
   first obs. used      1955-03-14  
   last obs. used      2018-10-10  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46461  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-21 06:19:22  

Additional Information
 Jupiter MOID = 1.54727 au 
 T_jup = 3.383 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.32082159711127E-16 -5.239713050615634E-16 -8.086021006810834E-14 -9.949642487804411E-14 3.803568027206353E-14 -2.018331842085519E-14
q -5.239713050615634E-16 1.183605177632132E-15 1.859528051110855E-13 2.234920874441246E-13 -8.341607897928603E-14 4.615957646185023E-14
tp -8.086021006810834E-14 1.859528051110855E-13 5.323447656061836E-11 1.431284396083268E-11 2.451118039858725E-11 1.213011210627717E-11
node -9.949642487804411E-14 2.234920874441246E-13 1.431284396083268E-11 3.084152949192903E-10 -3.009045925198398E-10 3.655588932660139E-11
peri 3.803568027206353E-14 -8.341607897928603E-14 2.451118039858725E-11 -3.009045925198398E-10 3.28065972023679E-10 -2.740574894659832E-11
i -2.018331842085519E-14 4.615957646185023E-14 1.213011210627717E-11 3.655588932660139E-11 -2.740574894659832E-11 3.121608174862407E-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 18.3   n/a MPO264974  
rotation period rot_per 2.5702 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:
[Pravec, P.; Wolf, M.; Sarounova, L. (2008) http://www.asu.cas.cz/~ppravec/neo.htm]

450894 (2008 BT18)          Discovered 2008-Jan-31 by LINEAR at Socorro
Reference: Last Updated: 2015-11-30

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