One of the most identifiable nebulae in the sky, the Horsehead Nebula in Orion, is part of a large, dark, molecular cloud. Also known as Barnard 33, the unusual shape was first discovered on a photographic plate in the late 1800s. The red glow originates from hydrogen gas predominantly behind the nebula, ionized by the nearby bright star Sigma Orionis. A blue reflection nebula surrounds the bright star at the lower left. The darkness of the Horsehead is caused mostly by thick dust, although the lower part of the Horsehead's neck casts a shadow to the left. Streams of gas leaving the nebula are funneled by a strong magnetic field. Bright spots in the Horsehead Nebula's base are young stars just in the process of forming. Light takes about 1500 years to reach us from the Horsehead Nebula. The above image was taken earlier this month with a 0.6-meter telescope at the Mt. Lemmon SkyCenter in Arizona, USA.Source : Astronomy Picture of the Day
Trivia : Coba sebutkan nomor NGC dari objek di atas? Apakah objek termasuk muncul di katalog Messier? Jika ya, coba sebutkan nomor katalognya?
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1 comment:
Sayang sekali Horsehead Nebula tidak masuk dalam kategori NGC. Jadi, Horsehead Nebula tidak punya nomor katalog NGC. Ia termasuk dalam kategori IC dengan nomro katalog 434. Ia juga tidak termasuk dalam katalog Messier.
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