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8942 Takagi (1997 BR2)
Classification: Main-belt Asteroid          SPK-ID: 2008942
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 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08259719559010938 3.7142e-08  
a 2.734239149651172 1.1532e-08 au
q 2.5083986638173 1.029e-07 au
i 4.385415217311957 4.2476e-06 deg
node 152.3430680961873 4.0578e-05 deg
peri 225.5676285332914 4.5743e-05 deg
M 170.8009106125126 2.2031e-05 deg
tp 2458216.996656826447
(2018-Apr-08.49665683)
9.964e-05 TDB
period 1651.403394343589
4.52
1.0447e-05
2.86e-08
d
yr
n .2179964030793913 1.3791e-09 deg/d
Q 2.960079635485044 1.2484e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1816  
   data-arc span      10396 days (28.46 yr)  
   first obs. used      1991-12-30  
   last obs. used      2020-06-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51798  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 03:17:18  

Additional Information
 Earth MOID = 1.51193 au 
 Jupiter MOID = 2.44097 au 
 T_jup = 3.344 
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Orbital Elements at Epoch 2456967.5 (2014-Nov-06.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08006482375339176 3.6891e-08  
q 2.517842465432858 1.0179e-07 au
tp 2456563.951269759962
(2013-Sep-28.45126976)
0.00010129 TDB
node 152.3637828889356 4.0608e-05 deg
peri 225.6986179034635 4.6129e-05 deg
i 4.380975205618358 4.2444e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1816  
   data-arc span      10396 days (28.46 yr)  
   first obs. used      1991-12-30  
   last obs. used      2020-06-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51798  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 03:17:18  

Additional Information
 Jupiter MOID = 2.44097 au 
 T_jup = 3.344 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.36095270101752E-15 -3.734995465521491E-15 -8.393239221979976E-13 9.479887780857907E-17 -2.174017273105255E-13 -5.525100442062463E-17
q -3.734995465521491E-15 1.036198707851126E-14 2.447334800184144E-12 -7.698288457666935E-16 6.323238578725524E-13 1.509304121586993E-16
tp -8.393239221979976E-13 2.447334800184144E-12 1.025955147820596E-8 -6.687206514966015E-12 2.222425468482444E-9 -1.583786155449445E-12
node 9.479887780857907E-17 -7.698288457666935E-16 -6.687206514966015E-12 1.648987951186751E-9 -1.6454227023124E-9 3.114355135312617E-11
peri -2.174017273105255E-13 6.323238578725524E-13 2.222425468482444E-9 -1.6454227023124E-9 2.127881381534984E-9 -3.139107572268402E-11
i -5.525100442062463E-17 1.509304121586993E-16 -1.583786155449445E-12 3.114355135312617E-11 -3.139107572268402E-11 1.801534105857863E-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 14.2   n/a MPO337332  
diameter diameter 4.278 km 0.251 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 332.194 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 0.242   0.029 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

8942 Takagi           Discovered 1997 Jan. 30 by T. Kobayashi at Oizumi.
Japanese planetary scientist Yasuhiko Takagi (b. 1958) has investigated impact fragmentation phenomena and the origin of minor-planet families based on laboratory experiments. He also contributed to the Near-Infrared Spectrometer on board the Hayabusa spacecraft.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20031110/MPCPages.arcLast Updated: 2003-11-12

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Alternate Designations
 1997 BR2 = 1991 YH2 = 1993 FN38 = 1993 HH8 = 1995 VN3 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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