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194268 (2001 UY4)
Classification: Apollo [NEO, PHA]          SPK-ID: 2194268
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 78 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .7874311999292493 5.6517e-08  
a 1.452807363392385 3.1083e-09 au
q .3088215179702703 8.2319e-08 au
i 5.437940455744582 4.9461e-06 deg
node 160.7490545772602 9.5705e-05 deg
peri 107.7635394148567 9.3476e-05 deg
M 116.7107445001244 7.0755e-06 deg
tp 2459189.142945986063
(2020-Dec-05.64294599)
1.216e-05 TDB
period 639.602975413611
1.75
2.0526e-06
5.62e-09
d
yr
n .5628491639945848 1.8063e-09 deg/d
Q 2.596793208814499 5.5558e-09 au
  Orbit Determination Parameters
   # obs. used (total)      452  
   data-arc span      6639 days (18.18 yr)  
   first obs. used      2001-10-16  
   last obs. used      2019-12-20  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .52228  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 22:23:42  

Additional Information
 Earth MOID = .0260649 au 
 Jupiter MOID = 2.54681 au 
 T_jup = 4.230 
[ 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 18.2   n/a MPO396502  
diameter diameter 1.244 km 0.020 urn:nasa:pds:neowise_diameters_albedos::2.0[neos] (http://adsabs.harvard.edu/abs/2011ApJ...743..156M)  
rotation period rot_per 6.8020 h n/a LCDB (Rev. 2020-October); 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:
[Monteiro, F.; Silva, J.S.; Lazzaro, D.; Arcoverde, P.; et al. (2018) Plan. Space Sci. 164, 54-74.]
geometric albedo albedo 0.055   0.010 urn:nasa:pds:neowise_diameters_albedos::2.0[neos] (http://adsabs.harvard.edu/abs/2011ApJ...743..156M)  
SMASSII spectral type spec_B X   n/a Binzel et al. (2004) Icarus 170, 259-294  

194268 (2001 UY4)          Discovered 2001-Oct-16 by LINEAR at Socorro
Reference: 20081113/Numbers.arcLast Updated: 2008-11-17

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