彗星19P/ボレリー号の観測は,ディープ・スペース1号のミニチュア・インテグレーテッド・カメラとスペクトロメーターによって行われた

L A Soderblom¹, T L Becker, G Bennett

¹United States Geological Survey, 2255 North Gemini Drive, Flagstaff, AZ 86001, USA. lsoderblom@usgs.gov

Science (New York, N.Y.)

|April 6, 2002

まとめ

Deep Space 1は彗星19P/Borrellyを観測し,表面の有意な変動を持つ熱くて乾燥した核を明らかにしました. その突出した塵の噴射は方向に固定され,原子核との並べ替えを示唆していた.

科学分野:

太陽系探査太陽系探査について
惑星科学惑星科学
彗星科学彗星科学

背景:

木星-_ファミリー_彗星_19P/ボレリー_は_8キロメートルの_天体_です.
The_Deep_Space_1_spacecraft_provided_close-up_observations_of_the_comet's_nucleus._The_Deep_Space_1_spacecraft_provided_close-up_observations_of_the_comet's_nucleus._The_Deep_Space_1_spacecraft_provided_close-up_observations_of_the_comet's_nucleus._The_Deep_Space_1_spacecraft_provided_close-up_observations_of_the_comet's_nucleus._The_Deep_Space_1_spacecraft_provided_by_the_comet's_nucleus._The_Deep_Space_1_spacecraft_provided_by_the_comet's_nucleus._The_Deep_Space_1_space_craftは,彗星の核を近くから観測した_宇宙船である.

研究の目的:

彗星19P/ボレリー星核の表面特性と組成を分析する.
彗星のコマにある塵の性質を調査する.

主な方法:

ミニチュア・インテグレーテッド・カメラとスペクトロメーター (MICAS) を使って,近距離画像とスペクトロスコピーを用いる.
短波長赤外線スペクトルの分析 (1.3~2.6ミクロメートル).

主要な成果:

核は,有意な表面異質性を示し,アルベドの変化は0.01から0.03までである.
Spectra_indicate_a_hot,_dry_surface_(
コーマは2種類の塵を特徴付けている. 扇風機とコリマートジェットで,その1つは流域から噴出する顕著なジェットである.
主な塵噴射の固定方向は,原子核の回転軸と一致することを示唆している.

結論:

19P/ボレリー彗星の表面は地質学的に複雑で,主に乾燥しています.
サブリメーションは,表面の10%未満で発生する可能性が高い.
主要な塵のジェットの方向は,彗星の回転軸を示しているかもしれない.

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