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16657 (1993 UB)
Classification: Amor [NEO]          SPK-ID: 2016657
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 94 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4602421603571455 5.4836e-08  
a 2.277932251212421 3.8127e-09 au
q 1.229531790767201 1.2567e-07 au
i 24.93961098257076 9.5972e-06 deg
node 31.20807699210674 1.4028e-05 deg
peri 21.22960587690536 1.8832e-05 deg
M 314.9861458671582 8.4231e-06 deg
tp 2459357.519406151230
(2021-May-23.01940615)
2.966e-05 TDB
period 1255.768636198633
3.44
3.1527e-06
8.632e-09
d
yr
n .2866770116904372 7.1973e-10 deg/d
Q 3.326332711657642 5.5674e-09 au
  Orbit Determination Parameters
   # obs. used (total)      457  
   data-arc span      9351 days (25.60 yr)  
   first obs. used      1993-10-23  
   last obs. used      2019-05-31  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .5265  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 01:38:01  

Additional Information
 Earth MOID = .254554 au 
 Jupiter MOID = 2.17906 au 
 T_jup = 3.350 
[ 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 16.7   n/a MPO435854  
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)

16657 (1993 UB)          Discovered 1993-Oct-23 by McNaught, R. H. at Siding Spring
Reference: 20000913/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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