## Results from the 2014 November 15th multi-chord stellar occultation
by the TNO (229762) 2007 UK126

####
G. Benedetti-Rossi, B. Sicardy, M. W. Buie, J. L. Ortiz,
R. Vieira-Martins, J. M. Keller, F. Braga-Ribas, J. I. B. Camargo,
M. Assafin, N. Morales, R. Duffard, A. Dias-Oliveira, P. Santos-Sanz,
J. Desmars, A. R. Gomes-Júnior, R. Leiva, J. Bardecker, J. K. Bean Jr.,
A. M. Olsen, D. W. Ruby, R. Sumner, A. Thirouin, M. A. Gómez-Muñoz,
L. Gutierrez, L. H. Wasserman, D. Charbonneau, J. Irwin, S. Levine, and
B. Skiff.
AJ 152, 156 (2016).

### ABSTRACT

We present results derived from the first multi-chord stellar occultation
by the trans-Neptunian object (229762) 2007 UK126, observed on 2014
November 15. The event was observed by the Research and Education
Collaborative Occultation Network project and International Occultation
Timing Association collaborators throughout the United States. Use of
two different data analysis methods obtain a satisfactory fit to seven
chords, yielding an elliptical fit to the chords with an equatorial
radius of R = 338 -10 +15 km and equivalent radius of R_eq = 319 -7 +14
km. A circular fit also gives a radius of R = 324 -23 +30 km. Assuming
that the object is a Maclaurin spheroid with indeterminate aspect angle,
and using two published absolute magnitudes for the body, we derive
possible ranges for geometric albedo between p_V = 0.159 -0.013 +0.007
and p_R = 0.189 -0.015 +0.009, and for the body oblateness between
eɛ= 0.105 -0.040 +0.050 and e = 0.118 -0.048 +0.055. For a nominal
rotational period of 11.05 hr, an upper limit for density of rho = 1740
kg m-3 is estimated for the body.

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