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

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 286 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .5800581893542669 2.6348e-08  
a 2.588927632619496 6.4148e-09 au
q 1.087198957673003 6.8682e-08 au
i 35.98758100810731 9.8107e-06 deg
node 3.350601123501733 6.3464e-06 deg
peri 62.17822127104486 9.3222e-06 deg
M 32.30146199767473 3.3658e-06 deg
tp 2458863.979468033551
(2020-Jan-15.47946803)
1.3957e-05 TDB
period 1521.522199566683
4.17
5.655e-06
1.548e-08
d
yr
n .236605157718057 8.7939e-10 deg/d
Q 4.09065630756599 1.0136e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1718  
   data-arc span      10613 days (29.06 yr)  
   first obs. used      1991-03-18  
   last obs. used      2020-04-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42544  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Apr-08 06:20:53  

Additional Information
 Earth MOID = .287569 au 
 Jupiter MOID = 2.47609 au 
 T_jup = 2.940 
[ 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 14.8   n/a MPO502240  
diameter diameter 3.698 km 0.060 urn:nasa:pds:neowise_diameters_albedos::2.0[neos] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)  
rotation period rot_per 97.1 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:
[Warner, B.D. (2016) Minor Planet Bull. 43, 311-319.]
geometric albedo albedo 0.155   0.026 urn:nasa:pds:neowise_diameters_albedos::2.0[neos] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)  
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 | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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