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We present lightcurve observations and multiband photometry for 107P/Wilson–Harrington using five small- and medium-sized telescopes. The lightcurve has shown a periodicity of 0.2979day (7.15h) and 0.0993day (2.38h), which has a commensurability of 3:1. The physical properties of the lightcurve indicate two models: (1) 107P/Wilson–Harrington is a tumbling object with a sidereal rotation period of...
The wide-field 1 m telescope with ten 2kx4k CCD chips was set up at the Bisei Spaceguard Center in Okayama prefecture, Japan. The Japan Spaceguard Association started to make space debris observations using this telescope in addition to the 50 and 25 cm telescopes. The 1 m telescope has a field of view of 2.5 o by 3.0 o and has the ability to detect space debris with a size of 30-50...
o-Azaxylylenes were generated only by gentle refluxing of N,O-diethoxycarbonyl-o-aminobenzyl alcohols in o-dichlorobenzene and then underwent the Diels-Alder reaction with dienophiles to give 1,2,3,4-tetrahydroquinolines.
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