Volume 550, February 2013
|Number of page(s)||4|
|Published online||04 February 2013|
Optical observations of NEA 162173 (1999 JU3) during the 2011-2012 apparition⋆
1 Department of AstronomyYonsei University, 50 Yonsei-ro, Seodaemun-gu, 120-749 Seoul, Korea
2 Korea Astronomy and Space Science Institute, 776 Daedeokdae-ro, Yuseong-gu, 305-348 Daejeon, Korea
3 Seoul National University, 1 Gwanak-ro, Gwanak-gu, 151-742 Seoul, Korea
4 German Aerospace Center (DLR), Rutherfordstraβe 2, 12489 Berlin, Germany
5 Akdeniz Universitesi, Fen Fakultesi, Dumlupinar Bulvari, Kampus, 07058 Antalya, Turkey
6 Okayama Astrophysical Observatory, National Astronomical Observatory of Japan, Asaguchi, 719-0232 Okayama, Japan
7 Nishi-Harima Astronomical Observatory, 407-2 Nishigaichi, Sayo-cho, Sayo-gun, 679-5313 Hyogo, Japan
Received: 31 October 2012
Accepted: 3 December 2012
Context. Near-Earth asteroid 162173 (1999 JU3) is a potential target of two asteroid sample return missions, not only because of its accessibility but also because of the first C-type asteroid for exploration missions. The lightcurve-related physical properties of this object were investigated during the 2011–2012 apparition.
Aims. We aim to confirm the physical parameters useful for JAXA’s Hayabusa 2 mission, such as rotational period, absolute magnitude, and phase function. Our data complement previous studies that did not cover low phase angles.
Methods. With optical imagers and 1−2 m class telescopes, we acquired the photometric data at different phase angles. We independently derived the rotational lightcurve and the phase curve of the asteroid.
Results. We have analyzed the lightcurve of 162173 (1999 JU3), and derived a synodic rotational period of 7.625 ± 0.003 h, the axis ratio a/b = 1.12. The absolute magnitude HR = 18.69 ± 0.07 mag and the phase slope of G = −0.09 ± 0.03 were also obtained based on the observations made during the 2011 − 2012 apparition. These physical properties are in good agreement with the previous results obtained during the 2007−2008 apparition.
Key words: minor planets, asteroids: individual: (162173) 1999 JU3
Photometric data is only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (18.104.22.168) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/550/L11
© ESO, 2013
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.