NGC 6572 是一个 行星状星云，视星等8.1，即使以业馀天文学家的小望远镜，它也是个足够明亮，可以轻松观测到的目标，因此很受业馀人士的注意。 它的位置在 蛇夫座，距离3,500光年，以低倍数观看时像一颗有颜色的恒星，但提高倍数就可以看出它的形状。 NGC 6572是在1825年被德国天文学家 瓦西里·雅可夫列维奇·斯特鲁维 发现的。 A Dazzling Planetary Nebula （页面存档备份，存于 互联网档案馆） — ESA / Hubble Picture of the week. ^ 1.0 1.1 1.2 SIMBAD …

NGC 6572 is a planetary nebula in the constellation Ophiuchus. It was discovered in 1825 by the German astronomer Friedrich Georg Wilhelm von Struve. According to several sources such as Sky & Telescope, this object received the nicknames Blue Racquetball, Emerald Nebula, Green Nebula, and Turquoise Orb.

NGC 6572 is a pretty young planetary nebula, estimated only a few thousand years old. As a result the glowing gas is still quite concentrated, which explains why it is abnormally bright. It expands at a speed of around 15 km/s.

NGC 6572 is a Planetary Nebula in the Ophiuchus constellation. NGC 6572 is situated close to the celestial equator and, as such, it is at least partly visible from both hemispheres in certain times of the year.

One of the brightest planetary nebulae in the sky, NGC 6572's compactness and small size (averaging about 14 seconds of arc in diameter) precludes visual observation of the intricate detail seen in the Hubble image (north up and to the left), with its central interlocking rings surrounded by fainter symmetrical lobes. Were it not for ...

NGC 6572 is a small but bright planetary nebula that is known for its intense blue-green color. Use high magnification for the best view. To its east are two bright open clusters, NGC 6633 and IC 4756, that are nice targets for binoculars or rich-field telescopes.

2014年10月1日 · Estimates of relative line intensities available in the literature and integrated Hβ fluxes of the planetary nebula NGC 6572 during the time covered by optical observations (1938–2013) are...

2021年7月19日 · Our object for the 150th monthly edition of the Observer’s Challenge is the tiny, but bright, planetary nebula NGC 6572, variously nicknamed the Emerald Nebula, the Blue Racquetball, and the Turquoise Orb. These names highlight the range of hues perceived by different observers. The nebula is young, perhaps only a few thousand years old.

Aller and Liller (1957) discovered the variability of the spectrum of IC 4997 and Vorontsov-Velyaminov (1961) found variations in line intensities of NGC 6905. Khromov (1962) tried to explain the variations in both nebulae as a result of temperature changes of the central stars.

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