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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 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 185 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .577915246522985 3.1612e-08  
a 2.592212715378837 5.4497e-09 au
q 1.09413346493066 8.2049e-08 au
i 36.01479320175343 1.0735e-05 deg
node 3.467312843591622 6.0243e-06 deg
peri 62.15138516747864 1.0674e-05 deg
M 61.12713474887845 3.4612e-06 deg
tp 2457341.657300604293
(2015-Nov-15.15730060)
1.4576e-05 JED
period 1524.419100703299
4.17
4.8073e-06
1.316e-08
d
yr
n .236155529561334 7.4472e-10 deg/d
Q 4.090291965827014 8.5992e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1222  
   data-arc span      9180 days (25.13 yr)  
   first obs. used      1991-03-18  
   last obs. used      2016-05-05  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .48358  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-May-05 05:50:09  

Additional Information
 Earth MOID = .293076 au 
 Jupiter MOID = 2.47031 au 
 T_jup = 2.939 
[ 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. 2016-February); 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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