65 citations · 247 across the 17 of their papers we have counts for
19 papers
Photometric and Spectroscopic Observations of Comet 2P/Encke's Nucleus in the Mid-Infrared Wavelength Region
Takafumi Ootsubo, Hideyo Kawakita, Jun-ichi Watanabe +2
We observed comet 2P/Encke with the Cooled Mid-Infrared Camera and Spectrometer (COMICS) on the Subaru telescope on UT 2003 November 12.3, when the comet was at heliocentric and ge…
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…
A post-perihelion constraint on the CO/HO ratio of interstellar comet 3I/ATLAS from [O I] forbidden lines
Yoshiharu Shinnaka, Ko Tsujimoto, Hideyo Kawakita +3
We present high-resolution optical spectroscopy of interstellar comet 3I/ATLAS (C/2025 N1) obtained with the High Dispersion Spectrograph mounted on the Subaru Telescope on UT 2026…
Activity and composition of the hyperactive comet 46P/Wirtanen during its close approach in 2018
Y. Moulane, E. Jehin, J. Manfroid +10
Hyperactive comets are a small group of comets whose activity are higher than expected. They seem to emit more water than they should based on the size of their nucleus and comet 4…
(3200) Phaethon Polarimetry in the Negative Branch: New Evidence for the Anhydrous Nature of the DESTINY+ Target Asteroid
Jooyeon Geem, Masateru Ishiguro, Jun Takahashi +23
We report on the first polarimetric study of (3200) Phaethon, the target of JAXA's DESTINY mission, in the negative branch to ensure its anhydrous nature and to derive an accur…
Detection of Be II in the Classical Nova V5669 Sgr (Nova Sagittarii 2015 No.3)
Akira Arai, Akito Tajitsu, Hideyo Kawakita +1
We report the new detection of Be II in the ultraviolet spectra of V5669 Sgr during its early decline phase ( and d). We identified three blue-shifted absorption sys…
The similarity of the interstellar comet 2I/Borisov to solar system comets from high resolution optical spectroscopy
C. Opitom, E. Jehin, D. Hutsemékers +11
2I/Borisov - hereafter 2I - is the first visibly active interstellar comet observed in the solar system, allowing us for the first time to sample the composition of a building bloc…
Mid-infrared observations of the nucleus of comet P/2016 BA14 (PANSTARRS)
Takafumi Ootsubo, Hideyo Kawakita, Yoshiharu Shinnaka
We present mid-infrared observations of comet P/2016 BA14 (PANSTARRS), which were obtained on UT 2016 March 21.3 at heliocentric and geocentric distances of 1.012 au and 0.026 au,…
Photometry and high-resolution spectroscopy of comet 21P/Giacobini-Zinner during its 2018 apparition
Y. Moulane, E. Jehin, P. Rousselot +7
We report on photometry and high resolution spectroscopy of the chemically peculiar Jupiter-family Comet (hereafter JFC) 21P/Giacobini-Zinner. Comet 21P is a well known member of t…
High-resolution optical spectroscopic observations of comet 21P/Giacobini-Zinner in Its 2018 apparition
Yoshiharu Shinnaka, Hideyo Kawakita, Akito Tajitsu
Comet 21P/Giacobini-Zinner is a peculiar comet from the viewpoints of the chemical and physical properties of its dust grains. We conduct optical high-resolution spectroscopic obse…
Amateur telescopes discover a kilometre-sized Kuiper belt object from stellar occultation
K. Arimatsu, K. Tsumura, F. Usui +7
Kuiper belt objects (KBOs) are thought to be the remnant of the early solar system, and their size distribution provides an opportunity to explore the formation and evolution of th…
Unidentified Infrared Emission Features in Mid-infrared Spectrum of Comet 21P/Giacobini-Zinner
Takafumi Ootsubo, Hideyo Kawakita, Yoshiharu Shinnaka +2
Comet 21P/Giacobini-Zinner (hereafter, comet 21P/G-Z) is a Jupiter-family comet and a parent comet of the October Draconids meteor shower. If meteoroids originating from a Jupiter-…
Comet 66P/du Toit: not a near Earth main belt comet
B. Yang, E. Jehin, F. J. Pozuelos +6
Main belt comets (MBCs) are a peculiar class of volatile-containing objects with comet-like morphology and asteroid-like orbits. However, MBCs are challenging targets to study remo…
Possibility of Concentration of Non-volatile Species near the Surface of Comet 67P/Churyumov-Gerasimenko
Taiki Suzuki, Yoshiharu Shinnaka, Liton Majumdar +4
The cometary materials are thought to be the reservoir of primitive materials in the Solar System. The recent detection of glycine and CHNH by the ROSINA mass spectrometer…
Large Polarization Degree of Comet 2P/Encke Continuum Based on Spectropolarimetric Signals During Its 2017 Apparition
Y. G. Kwon, M. Ishiguro, Y. Shinnaka +16
Spectropolarimetry is a powerful technique for investigating the physical properties of gas and solid materials in cometary comae without mutual contamination, but there have been…
Mid-infrared spectroscopic observations of comet 17P/Holmes immediately after its great outburst in October 2007
Yoshiharu Shinnaka, Takafumi Ootsubo, Hideyo Kawakita +3
Dust grains of crystalline silicate, which are rarely presented in interstellar space, were found in cometary nuclei. These crystalline silicates are thought to have formed by anne…
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…
Isotopic ratios in outbursting comet C/2015 ER61
Bin Yang, Damien Hutsemekers, Yoshiharu Shinnaka +7
Isotopic ratios in comets are critical to understanding the origin of cometary material and the physical and chemical conditions in the early solar nebula. Comet C/2015 ER61 (PANST…
Mid-infrared Spectroscopic Observations of the Dust-forming Classical Nova V2676 Oph
Hideyo Kawakita, Takafumi Ootsubo, Akira Arai +2
The dust-forming nova V2676 Oph is unique in that it was the first nova to provide evidence of C_2 and CN molecules during its near-maximum phase and evidence of CO molecules durin…