东亚天文学会.pdfVIP

ＩＳＳＮ ０９１７－７３８８ COMMUNICATIONS IN 東亞天文學會 『火星通信』since 1986 MARS No. 364 25 November 2009 O B S E R V A T I O N S Published by the OAA Mars Section CMO 2009/2010 Mars Report #08 OAA Mars Section ♂･････Here we treat the case of the Mars observation made during the period ： 16 October (λ=355°Ls) to 15 November (λ=010°Ls) 2009 As is indicated, the northern spring equinox passed during the period, and the new season of the north‐ ern hemisphere has begun. Especially we expect soon to see the clear north polar cap (npc) to start thaw‐ ing. During the present period, the angular diameter δ went up from 7.2ʺ to 8.8ʺ, quite large enough to the ccd images. The apparent declination is 21.3°N to 18.5°N, but still higher (from the northern hemi‐ sphere) and soon the planet goes high up. The central latitude φ was from 15°N to 18°N, and it became difficult to observed the region near the south circumpolar region. The phase angle ιwas from 40° down to 38°, but quite gibbous. However it is a good opportunity to see Valhalla as well as a fine canal to the north of S Sabaeus. The sky condition in Japan this period proved rather fine, but it was extraordinary and the weather in winter continues dismal usually. ♂･････ 今回の報告は16 October (λ=355°Ls) から15 November (λ=010°Ls) 2009迄の報告になる。途中 季節は北半球の春分に到達した。この間視直径δは7.2ʺから8.8ʺに延び、大きくなったという感じであ る。ccd でも好い像が出てきている。中央緯度φは15°Nから18°N になって南極方面は見辛くなってき た。位相角は40° から38° に落ちたが、まだ欠けがきつい。ただワルハッラなどを捉えるのは好機であ る。視赤緯は依然高く、直ぐ天頂近くになる。21.3°N から18.5°N に降りてきたが、最接近の頃はまた 高くなるので屈折では苦労である。日本の天候はこの期間は恵まれた方であるが、10月後半から既 に冬型が始まって、晴天が見られな