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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 ]

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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 107 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .593129310701468 1.4886e-08  
a 2.221980042759514 2.5172e-09 au
q .9040585516051451 3.3559e-08 au
i 8.134951784956241 5.5745e-06 deg
node 107.6238378992788 1.7432e-05 deg
peri 139.352746841284 1.796e-05 deg
M 281.5823224690152 3.057e-06 deg
tp 2459464.023974990330
(2021-Sep-06.52397499)
1.0685e-05 TDB
period 1209.786287779738
3.31
2.0558e-06
5.628e-09
d
yr
n .2975732190358104 5.0566e-10 deg/d
Q 3.539901533913883 4.0102e-09 au
  Orbit Determination Parameters
   # obs. used (total)      427  
   # delay obs. used      2  
   # Doppler obs. used      1  
   data-arc span      24049 days (65.84 yr)  
   first obs. used      1955-03-14  
   last obs. used      2021-01-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46389  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-14 15:13:55  

Additional Information
 Earth MOID = .0113519 au 
 Jupiter MOID = 1.54647 au 
 T_jup = 3.383 
[ 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 18.12   n/a MPCxxxxx  
rotation period rot_per 2.5702 h n/a LCDB (Rev. 2020-October); 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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Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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