NGC 40 (also known as the Bow-Tie Nebula and Caldwell 2) is a planetary nebula discovered by William Herschel on November 25, 1788, and is composed of hot gas around a dying star. The star has ejected its outer layer which has left behind a small, hot star. [4]

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NGC 40 is a Planetary Nebula in the Cepheus constellation. NGC 40 is situated close to the northern celestial pole and, as such, it is visible for most part of the year from the northern hemisphere. Given its visual magnitude of 11.89, NGC 40 is visible with the help of a telescope having an aperture of 8 inches (200mm) or more.

The central star of NGC 40 is a recently formed proto-white dwarf with a surface temperature of about 50'000 K. The nebula is about 3000-4000 light years away and based on its angular extent of about 1.2 x 0.75 arc minutes, it measures about 1.2 light years in diameter.

2023年10月11日 · NGC 40 (PK 120+09 1, Caldwell 2, the Bow-Tie Nebula and many others) is a large, bright planetary nebula located approximately, 5,800 light-years away in Cepheus. Imaged September 23rd and 24th and October 2nd and 3rd, 2023 at Dark Sky New Mexico at Rancho Hidalgo (Animas, New Mexico) with a SBIG STF-8300M on an Astro-Tech AT12RCT at f/8 …

2024年1月19日 · The Bow-Tie Nebula (NGC 40, Caldwell 2) is a planetary nebula located approximately 5,280 light-years away in the constellation Cepheus. With an apparent magnitude of 11.6, it can be observed in amateur telescopes.

2024年9月16日 · This hazy Hubble image captures a portion of the planetary nebula Caldwell 2, or NGC 40. A shell of gas is expanding outward from the nebula’s central star, which has reached the final stage of its life. Energy from the dying star is …

2023年9月18日 · NGC 40 is a planetary nebula in Cepheus. It’s also known as the Bow-Tie Nebula. NGC 40 is very small on the sky, measuring just 38″ x 35″. That is probably why it’s not imaged often: a very long focal length is needed to bring it up to a decent size on the sensor.

From Virginia Beach , the Bow Tie Nebula is visible all night because it is circumpolar. It will be highest in the sky shortly before dawn, when it will be lost to twilight at around 05:57, 29° above your northern horizon. At dusk, it will become visible at around 20:20 (EDT), 29° above your northern horizon.

NGC40, also known as the bow tie nebula, is a planetary nebula (PN) in the constellation of Cepheus. It lies at a distance of roughly 3500 light years and spans 1.25 light years in diameter and is onl...