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J/A+A/598/A63           2015 TB145 light curve                  (Mueller+, 2017)

Large Halloween asteroid at lunar distance. Mueller T.G., Marciniak A., Butkiewicz-Bak M., Duffard R., Oszkiewicz D., Kaeufl H.U., Szakats R., Santana-Ros T., Kiss C., Santana-Sanz P. <Astron. Astrophys. 598, A63 (2017)> =2017A&A...598A..63M (SIMBAD/NED BibCode)
ADC_Keywords: Minor planets ; Photometry Keywords: minor planets, asteroids: individual: 2015 TB145 - radiation mechanisms: thermal - techniques: photometric - infrared: planetary systems Abstract: The near-Earth asteroid (NEA) 2015 TB145 had a very close encounter with Earth at 1.3 lunar distances on October 31, 2015. We obtained 3-band mid-infrared observations of this asteroid with the ESO VLT-VISIR instrument covering about 4 hours in total. We also monitored the visual lightcurve during the close-encounter phase. The NEA has a (most likely) rotation period of 2.939±0.005-hours and the visual lightcurve shows a peak-to-peak amplitude of about 0.12±0.02mag. A second rotation period of 4.779±0.012h, with an amplitude of the Fourier fit of 0.10±0.02mag, also seems compatible with the available lightcurve measurements. We estimate a V-R colour of 0.56±0.05mag from different entries in the MPC database. A reliable determination of the object's absolute magnitude was not possible. Applying different phase relations to the available R-/V-band observations produced HR=18.6mag (standard H-G calculations) or HR=19.2mag and HV=19.8mag (via the H-G12 procedure for sparse and low-quality data), with large uncertainties of about 1mag. We performed a detailed thermophysical model analysis by using spherical and partially also ellipsoidal shape models. The thermal properties are best explained by an equator-on (±∼30°) viewing geometry during our measurements with a thermal inertia in the range 250-700J/m2/s0.5/K (retrograde rotation) or above 500J/m2/s0.5/K (prograde rotation). We find that the NEA has a minimum size of about 625m, a maximum size of just below 700m, and a slightly elongated shape with a/b∼1.1. Description: In this paper we used photometric data gained by the 1.23-m telescope at Calar Alto Observatory (CAHA) in Almeria (Spain), the 1.5-m telescope at Sierra Nevada Observatory (OSN) in Granada (Spain) and the 0.80-m telescope at La Hita Observatory, near Toledo, also in Spain. Additionally we worked with data presented by Warner et al. (2016). objects: ------------------------------------------------------ Name H i e a (mag) (deg) (AU) ------------------------------------------------------ 2015 TB145 19.97 19.697116 0.86036548 2.10240435 ------------------------------------------------------ File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table.dat 22 1503 Photometric data of 2015 TB145 used for this work
Byte-by-byte Description of file: table.dat
Bytes Format Units Label Explanations
1- 14 F14.6 d JD Julian date 16- 22 F7.4 mag mag Magnitude
Acknowledgements: Thomas Mueller, tmueller(at), MPI fuer Extraterrestrische Physik
(End) Thomas Mueller [MPI], Patricia Vannier [CDS] 24-Oct-2016
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