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Opposition effect of comet 28P/Neujmin observed with Subaru Hyper Suprime-Cam
Takafumi Ootsubo, Hideyo Kawakita, Tadafumi Takata +8
We present an observational study of the nucleus of comet 28P/Neujmin at a heliocentric distance exceeding 10 au, where coma contamination is effectively minimized. Observations we…
Color and Size Distributions of Small Jupiter Trojans
Fumi Yoshida, Tsuyoshi Terai, Keiji Ohtsuki
We conducted a two-band imaging survey observation using the Subaru Telescope and its wide-field camera, Suprime-Cam, to study the visible colors and size distribution of Jupiter's…
Discovery and dynamics of a Sedna-like object with a perihelion of 66 au
Ying-Tung Chen, Patryk Sofia Lykawka, Yukun Huang +30
Trans-Neptunian objects (TNOs) with large perihelion distances ( au) and semi-major axes ( au) provide insights into the early evolution of the solar system and th…
An Extremely Deep Rubin Survey to Explore the Extended Kuiper Belt and Identify Objects Observable by New Horizons
JJ Kavelaars, Marc W. Buie, Wesley C. Fraser +22
A proposed Vera C. Rubin Observatory Deep Drilling micro-survey of the Kuiper Belt will investigate key properties of the distant solar system. Utilizing 30 hours of Rubin time acr…
Candidate Distant Trans-Neptunian Objects Detected by the New Horizons Subaru TNO Survey
Wesley C. Fraser, Simon B. Porter, Lowell Peltier +41
We report the detection of 239 trans-Neptunian Objects discovered through the on-going New Horizons survey for distant minor bodies being performed with the Hyper Suprime-Cam mosai…
Size Distribution of Small Jupiter Trojans in the L5 Swarm
Kotomi Uehata, Tsuyoshi Terai, Keiji Ohtsuki +1
We present an analysis of survey observations of the trailing L5 Jupiter Trojan swarm using the wide-field Hyper Suprime-Cam CCD camera on the 8.2 m Subaru Telescope. We detected 1…
Size distributions of bluish and reddish small main-belt asteroids obtained by Subaru/Hyper Suprime-Cam
Natsuho Maeda, Tsuyoshi Terai, Keiji Ohtsuki +3
We performed a wide-field survey observation of small asteroids using the Hyper Suprime-Cam installed on the 8.2 m Subaru Telescope. We detected more than 3,000 main-belt asteroids…
FOSSIL: I. The Spin Rate Limit of Jupiter Trojans
Chan-Kao Chang, Ying-Tung Chen, Wesley C. Fraser +25
Rotation periods of 53 small (diameters km) Jupiter Trojans (JTs) were derived using the high-cadence light curves obtained by the FOSSIL phase I survey, a Subaru/Hype…
Optical spectroscopy and photometry of main-belt asteroids with a high orbital inclination
Aya Iwai, Yoichi Itoh, Tsuyoshi Terai +3
We carried out low-resolution optical spectroscopy of 51 main-belt asteroids, most of which have highly-inclined orbits. They are selected from D-type candidates in the SDSS-MOC 4…
Colors of Centaurs observed by the Subaru/Hyper Suprime-Cam and implications for their origin
Haruka Sakugawa, Tsuyoshi Terai, Keiji Ohtsuki +4
Centaurs have orbits between Jupiter and Neptune and are thought to originate from the trans-Neptunian region. Observations of surface properties of Centaurs and comparison with th…
Inversion angle of phase-polarization curve of near-Earth asteroid (3200) Phaethon
Yoshiharu Shinnaka, Toshihiro Kasuga, Reiko Furusho +5
The linear polarization degree (referred to the scattering plane, P_r) as a function of the solar phase angle, α, of solar system objects is a good diagnostic to understand the sca…
Size Distribution of Small Hilda Asteroids
Tsuyoshi Terai, Fumi Yoshida
We present the size distribution for Hilda asteroid group using optical survey data obtained by the 8.2 m Subaru Telescope with the Hyper Suprime-Cam. Our unbiased sample consists…
Small Jupiter Trojans Survey with Subaru/Hyper Suprime-Cam
Fumi Yoshida, Tsuyoshi Terai
We observed the L4 Jupiter Trojans (L4 JTs) swarm using the Hyper Suprime-Cam attached to the 8.2~m Subaru telescope on March 30, 2015 (UT). The survey covered 26~deg o…
Multi-band Photometry of Trans-Neptunian Objects in the Subaru Hyper Suprime-Cam Survey
Tsuyoshi Terai, Fumi Yoshida, Keiji Ohtsuki +7
We present a visible multi-band photometry of trans-Neptunian objects (TNOs) observed by the Subaru Telescope in the framework of Hyper Suprime-Cam Subaru Strategic Program (HSC-SS…
Photometric Measurements of H2O Ice Crystallinity on Trans-Neptunian Objects
Tsuyoshi Terai, Yoichi Itoh, Yumiko Oasa +2
We present a measurement of H2O ice crystallinity on the surface of trans-neptunian objects (TNOs) with near-infrared narrow-band imaging. The newly developed photometric technique…
Detection of Remnant Dust Cloud Associated with the 2007 Outburst of 17P/Holmes
Masateru Ishiguro, Yuki Sarugaku, Daisuke Kuroda +11
This paper reports a new optical observation of 17P/Holmes one orbital period after the historical outburst event in 2007. We detected not only a common dust tail near the nucleus,…
Initial Speed of Knots in the Plasma Tail of C/2013 R1(Lovejoy)
Masafumi Yagi, Jin Koda, Reiko Furusho +3
We report short-time variations in the plasma tail of C/2013 R1(Lovejoy). A series of short (two to three minutes) exposure images with the 8.2-m Subaru telescope shows faint detai…
Time-series photometry of Earth flyby asteroid 2012 DA14
Tsuyoshi Terai, Seitaro Urakawa, Jun Takahashi +7
Context. The object 2012 DA14 is a near-Earth asteroid with a size of several tens of meters. It had approached closely the Earth on 15 February, 2013 UT, providing an opportunity…
High Ecliptic Latitude Survey for Small Main-Belt Asteroids
Tsuyoshi Terai, Jun Takahashi, Yoichi Itoh
Main-belt asteroids have been continuously colliding with one another since they were formed. Its size distribution is primarily determined by the size dependence of asteroid stren…
Visible Spectroscopic Observations of Near-Earth Object 2012 DA14
Seitaro Urakawa, Mitsugu Fujii, Hidekazu Hanayama +3
We present visible spectroscopic observations of a near-earth object (NEO) 2012 DA14. The asteroid 2012 DA14 came close to the surface of the Earth on February 15, 2013 at a distan…
High-Precision Measurements of Brightness Variation of Nereid
Tsuyoshi Terai, Yoichi Itoh
Nereid, a satellite of Neptune, has a highly eccentric prograde orbit with a semi-major axis larger than 200 Neptune radius and is classified as an irregular satellite. Although th…
Size Distribution of Main-Belt Asteroids with High Inclination
Tsuyoshi Terai, Yoichi Itoh
We investigated the size distribution of high-inclination main-belt asteroids (MBAs) to explore asteroid collisional evolution under hypervelocity collisions of around 10 km/s. We…