さぎたりうす
登録日: 2004.08.09
記事: 4405
所在地: 大阪府大阪市東淀川区
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 日時: Wed Jan 27, 2010 1:17 am 記事の件名: こぐま座γ群の突発 |
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CBETに以下のような情報が出ました。（NMS同報から転載）
| Quote: |
> Electronic Telegram No. 214
6
>Central Bureau for Astronomical Telegrams
>INTERNATIONAL ASTRONOMICAL UNION
>M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
>IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
>CBAT@CFA.HARVARD.EDU (science)
>URL http://www.cfa.harvard.edu/iau/cbat.html
>
>
>METEOR OUTBURST OF GAMMA URSAE MINORIDS
> P. Jenniskens, SETI Institute; and Esko Lyytinen, Helsinki, Finland,
>report that six Finnish observers using wide-angle video cameras (limiting
>magnitude +1) observed a possible outburst of gamma Ursae Minorids, a newly
>discovered stream (cf. CBET 1938) that until now was only known from radar
>observations (limiting magnitude +8 ) of much weaker meteors. On the night
>of 2010 Jan. 20/21 (solar long. = 300.7 deg), Ilkka Yrjola (Kuusankoski,
>Finland), Pekka Kokko (Ylikiiminki), Mika Jaervinen (Joutsa), Ari Jokinen
>(Jarvenpaa), Timo Kantola (Piksamaki), and Jarmo Moilanen (Vaala) detected
>meteors radiating from a radiant at R.A. = 228.0 deg, Decl. = +66.4 deg (10
>meteors in total: 4, 1, 1, 1, 3, and 2 meteors per site, respectively). One
>three-station meteor on Jan. 20d17h17m55s had a radiant at R.A. = 230.2, Decl
.
>= +67.1 and speed V_g = 29.6 km/s, corresponding to the following osculating
>orbital elements: a = 2.84 AU, q = 0.955 AU, e = 0.664, Peri. = 202.3 deg,
>Node = 300.404 deg, and i = 48.5 deg (equinox 2000.0). Within the error,
>this radiant is identical to that of the recently discovered (CBET 1938)
>gamma Ursae Minorids shower (IAU Meteor Shower No. 404), which peaks at solar
>long. = 299.0 deg and is active for 11 days. On the day of the video
>observation, the annual shower would have radiated from R.A. = 232.5 deg,
>Decl. = +66.2 deg, with V_g = 31.8 km/s, in good agreement with the radiant
>of what appears to be a meteor outburst. The observed 2010 meteors are
>relatively bright (+0.55 mean magnitude), which implies that the shower had a
>low magnitude-distribution index of chi = 1.65 +/- 0.35. This suggests that
>the shower had an outburst of relatively bright meteors. The shower was
>still weakly active on the night of Jan. 21/22, when Yrjola and Jaervinen
>captured a two-station meteor radiating from R.A. = 229.8 deg, Decl. = +66.4
>deg, V_g = 29.6 km/s (solar long. = 301.612 deg).
>
>
>NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
> superseded by text appearing later in the printed IAU Circulars.
>
> (C) Copyright 2010 CBAT
>2010 January 26 (CBET 2146) Daniel W. E. Green
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SonotaCoネットワークでもそれらしき集中が見られます。
--------------------------
上田さん＞
ご指摘ありがとうございます。
DEC+60°台ならおおぐま座と思い込んでました。
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最終編集者 さぎたりうす [ Wed Jan 27, 2010 8:30 pm ], 編集回数 1 回 |
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