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Night sky with Comet C/2025 A6 (Lemmon) photographed in Ojiya, Niigata
Night sky with Comet C/2025 A6 (Lemmon) photographed in Ojiya, Niigata

Negi Asa

2025年10月24日の夜に、新潟県小千谷市で撮影したレモン彗星（C/2025 A6）です。 彗星撮影のチャンスに晴れた空を求めて遠くまで行く必要がありました。 彗星は氷と塵でできた小さな天体です。太陽系が生まれた約46億年前の材料を今も残していて太陽系の化石とも呼ばれます。太陽に近づくと氷が蒸発してガスと塵を放ち尾を伸ばします。この写真でも緑色に光る頭から黄色っぽい塵の尾が伸び、その先に青いガスの尾が細くたなびいています。 レモン彗星が前回太陽に近づいたのは7世紀ごろと計算されています。日本では飛鳥時代です。次に戻ってくるのは千年以上先になります。私が撮ったのはその長い旅のうちの1時間ほどです。 撮影中にカメラの画面で見えたのは、緑がかった頭と短い尾だけでした。21枚を重ねて処理すると、淡い尾が浮かび上がってきました。この尾がA2のプリントでどう見えるのか、会場で確かめるのを楽しみにしています。次に明るい彗星が来たらまた撮りに行きます。

SONY α7R V
85mm F1.4 DG DN | Art 020
November 1, 2026
Available for free under the cizucu license
2999 × 2000

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