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] Radiation from the star causes the shed outer layer to heat to about 10,000 degrees Celsius and become visible as a planetary nebula.

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NGC 40: Combination of a recording in optical light (red) and X-rays (blue) Planetary nebulae are the result of a sun-like star that ejected material into space during its transformation from a red giant to a white dwarf. The central star of NGC 40 is a recently formed proto-white dwarf with a surface temperature of about 50'000 K.

2024年1月19日 · NGC 40 is one of a class of objects called planetary nebulae, so-called because they look like the disk of a planet when viewed with a small telescope. Radiation from the hot star heats the ejected matter to about 10,000 degrees to produce the complex and graceful nebula (red) about a light year across.

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.

2023年10月11日 · NGC 40 - posted in Experienced Deep Sky Imaging: 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. Ha – 26x1800s – 780 minutes – binned 1x1 Luminance – 24x600s – 240 minutes – binned 1x1 RGB – 8x300s – 40 minutes each – binned 2x2 1140 minutes total exposure – 19 ...

From Virginia Beach , the Bow Tie Nebula is visible all night because it is circumpolar.It will be highest in the sky at dusk, becoming accessible at around 20:10 (EDT), 33° above your northern horizon.

2020年6月30日 · Planetary nebula NGC 40. This is a combination of seven exposures through B, V and R filters taken in November of 1996 at the 3.5-meter WIYN telescope. Planetary nebula NGC40 is a low-excitation nebula in the constellation of Cepheus, about 4000 light-years away from Earth. The central star is fairly bright (about magnitude 11.6), has a mass of ...

2023年9月18日 · NGC 40 is a very small planetary nebula in Cepheus. Imaged from Guelph, Ontario by Canadian astrophotographer Ron Brecher. NGC 40, the Bow-Tie Nebula Click image for full size version September 18, 2023 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".

TARGET Nomenclature: NGC 40, Caldwell 2, Bow-tie nebula Right Ascension: 00:13:01.015 Declination: +72:31:19.085 Size: 56 arc sec Discovery: William Herschel on November 25, 1788 EQUIPMENT USED Twin APM TMB LZOS 152 refractors 10Micron GM2000 HPS mount Twin QSI6120 CCD cameras