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9400 (1994 TW1)
Classification: Amor [NEO]          SPK-ID: 2009400
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2457400.5 (2016-Jan-13.0) TDB
Reference: JPL 141 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .5777124232757943 3.9367e-08  
a 2.591494610587004 5.5041e-09 au
q 1.094355979198625 1.0233e-07 au
i 36.01231712332334 1.3987e-05 deg
node 3.46844733358847 6.9242e-06 deg
peri 62.14739186611442 1.0945e-05 deg
M 13.91159325059844 3.6134e-06 deg
tp 2457341.615870071933
(2015-Nov-15.11587007)
1.5268e-05 JED
period 1523.785693863082
4.17
4.8546e-06
1.329e-08
d
yr
n .2362536946303339 7.5267e-10 deg/d
Q 4.088633241975383 8.6839e-09 au
  Orbit Determination Parameters
   # obs. used (total)      904  
   data-arc span      9093 days (24.90 yr)  
   first obs. used      1991-03-18  
   last obs. used      2016-02-08  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .52165  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Feb-09 06:19:35  

Additional Information
 Earth MOID = .292914 au 
 Jupiter MOID = 2.47174 au 
 T_jup = 2.940 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.8 mag n/a PDS3 (MPC 32629)  
rotation period rot_per 82.8 h n/a LCDB (Rev. 2015-December); 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. (2016) Minor Planet Bul. 43, 66-79.]
SMASSII spectral type spec_B Sr   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

9400 (1994 TW1)          Discovered 1994-Oct-09 by Helin, E. F., Lawrence, K. J. at Palomar
Reference: 19981005/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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