Access to Astronomical Catalogues

← Click to display the menu
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
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

catalogue service

© Unistra/CNRS