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471241 (2011 BX18)
Classification: Apollo [NEO, PHA]          SPK-ID: 2471241
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 93 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .729420328009125 1.8801e-08  
a 2.877509107593865 1.5363e-08 au
q .7785954704835033 5.6781e-08 au
i 14.55268514731631 1.3871e-05 deg
node 310.9044283909606 2.2823e-05 deg
peri 303.9508882498718 2.3003e-05 deg
M 330.5799626253736 2.6121e-06 deg
tp 2459346.201561623363
(2021-May-11.70156162)
1.3974e-05 TDB
period 1782.885640711275
4.88
1.4278e-05
3.909e-08
d
yr
n .2019198493608258 1.6171e-09 deg/d
Q 4.976422744704226 2.6569e-08 au
  Orbit Determination Parameters
   # obs. used (total)      423  
   # delay obs. used      1  
   # Doppler obs. used      0  
   data-arc span      3702 days (10.14 yr)  
   first obs. used      2011-01-26  
   last obs. used      2021-03-16  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .49313  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-14 16:25:13  

Additional Information
 Earth MOID = .0289744 au 
 Jupiter MOID = .98474 au 
 T_jup = 2.793 
[ 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 18.2   n/a MPO383349  
diameter diameter 1.451 km 0.221 urn:nasa:pds:neowise_diameters_albedos::2.0[neos] (http://adsabs.harvard.edu/abs/2017AJ....154..168M)  
rotation period rot_per 4.828 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:
[Warner, B.D. (2017) Minor Planet Bull. 44, 22-36.]
geometric albedo albedo 0.044   0.014 urn:nasa:pds:neowise_diameters_albedos::2.0[neos] (http://adsabs.harvard.edu/abs/2017AJ....154..168M)  

471241 (2011 BX18)          Discovered 2011-Jan-26 by Mt. Lemmon Survey at Mount Lemmon
Reference: Last Updated: 2016-08-22

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Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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