93 citations · 452 across the 25 of their papers we have counts for
16 papers · 1 filter
Relationship between Radar Cross Section and Optical Magnitude based on Radar and Optical Simultaneous Observations of Faint Meteors
Ryou Ohsawa, Akira Hirota, Kohei Morita +40
Radar and optical simultaneous observations of meteors are important to understand the size distribution of the interplanetary dust. However, faint meteors detected by high power l…
New constraint on the atmosphere of (50000) Quaoar from a stellar occultation
Ko Arimatsu, Ryou Ohsawa, George L. Hashimoto +35
We report observations of a stellar occultation by the classical Kuiper belt object (50000) Quaoar occurred on 28 June 2019. A single-chord high-cadence (2 Hz) photometry dataset w…
Physical properties of near-Earth asteroids with a low delta-: Survey of target candidates for the Hayabusa2 mission
Sunao Hasegawa, Daisuke Kuroda, Kohei Kitazato +40
Sample return from the near-Earth asteroid known as 25143 Itokawa was conducted as part of the Hayabusa mission, with a large number of scientific findings being derived from the r…
Luminosity Function of Faint Sporadic Meteors measured with a Wide-Field CMOS mosaic camera Tomo-e PM
Ryou Ohsawa, Shigeyuki Sako, Yuki Sarugaku +34
Imaging observations of faint meteors were carried out on April 11 and 14, 2016 with a wide-field CMOS mosaic camera, Tomo-e PM, mounted on the 105-cm Schmidt telescope at Kiso Obs…
Ground-based lightcurve observation campaign of (25143) Itokawa between 2001 and 2004
Setsuko Nishihara, Kouhei Kitazato, Masanao Abe +9
The asteroid (25143) Itokawa is a target object of the Japanese sample return mission, HAYABUSA. We have observed Itokawa in optical wave- length (R-band) with the 1.05-m Schmidt t…
2014-2015 Multiple Outbursts of 15P/Finlay
Masateru Ishiguro, Daisuke Kuroda, Hidekazu Hanayama +21
Multiple outbursts of a Jupiter-family comet, 15P/Finlay, occurred from late 2014 to early 2015. We conducted an observation of the comet after the first outburst and subsequently…
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,…
Optical and Near-Infrared Polarimetry for a Highly Dormant Comet 209P/LINEAR
Daisuke Kuroda, Masateru Ishiguro, Makoto Watanabe +24
We conducted an optical and near-infrared polarimetric observation of the highly dormant Jupiter-Family Comet, 209P/LINEAR. Because of its low activity, we were able to determine t…
Dust from Comet 209P/LINEAR during its 2014 Return: Parent Body of a New Meteor Shower, the May Camelopardalids
Masateru Ishiguro, Daisuke Kuroda, Hidekazu Hanayama +29
We report a new observation of the Jupiter-family comet 209P/LINEAR during its 2014 return. The comet is recognized as a dust source of a new meteor shower, the May Camelopardalids…
Lightcurve Survey of V-type Asteroids in the Inner Asteroid Belt
Sunao Hasegawa, Seidai Miyasaka, Hiroyuki Mito +17
We have observed the lightcurves of 13 V-type asteroids ((1933) Tinchen, (2011) Veteraniya, (2508) Alupka, (3657) Ermolova, (3900) Knezevic, (4005) Dyagilev, (4383) Suruga, (4434)…
17P/Holmes: Contrast in activity between before and after the 2007 outburst
Masateru Ishiguro, Yoonyoung Kim, Dhanraj S. Warjurkar +9
A Jupiter-family comet, 17P/Holmes, underwent outbursts in 1892 and 2007. In particular, the 2007 outburst is known as the greatest outburst over the past century. However, little…
Lightcurve Survey of V-type Asteroids. I. Observations until Spring 2004
Sunao Hasegawa, Seidai Miyasaka, Chiaki Yoshizumi +6
To examine the distribution of rotational rates for chips of asteroid 4 Vesta, lightcurve observation of seven V-type asteroids (2511 Patterson, 2640 Hallstorm, 2653 Principia, 279…
Multiband Optical Observation of P/2010 A2 Dust Tail
Junhan Kim, Masateru Ishiguro, Hidekazu Hanayama +6
An inner main-belt asteroid, P/2010 A2, was discovered on January 6th, 2010. Based on its orbital elements, it is considered that the asteroid belongs to the Flora collisional fami…
Interpretation of (596) Scheila's Triple Dust Tails
Masateru Ishiguro, Hidekazu Hanayama, Sunao Hasegawa +16
Strange-looking dust cloud around asteroid (596) Scheila was discovered on 2010 December 11.44-11.47. Unlike normal cometary tails, it consisted of three tails and faded within two…
Thermo-physical properties of 162173 (1999 JU3), a potential flyby and rendezvous target for interplanetary missions
T. G. Mueller, J. Durech, S. Hasegawa +15
Near-Earth asteroid 162173 (1999 JU3) is a potential flyby and rendezvous target for interplanetary missions because of its easy to reach orbit. The physical and thermal properties…
2006 Fragmentation of Comet 73P/Schwassmann-Wachmann 3B Observed with Subaru/Suprime-Cam
Masateru Ishiguro, Fumihiko Usui, Yuki Sarugaku +1
We analyzed the Subaru/Suprime-Cam images of 73P/Schwassmann-Wachmann 3B and detected no fewer than 154 mini-comets. We applied synchrone-syndyne analysis, modified for rocket effe…