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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…
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…
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…
Dense optical and near-infrared monitoring of CTA 102 during high state in 2012 with OISTER: Detection of intra-night "orphan polarized flux flare"
Ryosuke Itoh, Yasushi Fukazawa, Yasuyuki T. Tanaka +35
CTA 102, classified as a flat spectrum radio quasar at z=1.037, produced exceptionally bright optical flare in 2012 September. Following Fermi-LAT detection of enhanced gamma-ray a…
Phase Variation of Earthshine Polarization Spectra
Jun Takahashi, Yoichi Itoh, Hiroshi Akitaya +4
We present the results of the optical spectropolarimetry of Earthshine on the Moon for Earth phase angles ranging from 49 to 96 degrees. The observations were conducted on 2011 Mar…