NGC 246
Planetary Nebula NGC 246 |
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Image taken with the 81 cm reflecting telescope of the Mount Lemmon Observatory | |
AladinLite | |
Constellation | whale |
Position equinox : J2000.0 |
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Right ascension | 00h 47m 03.3s |
declination | -11 ° 52 ′ 17 ″ |
Appearance | |
Apparent brightness (visual) | 10.9 likes |
Apparent brightness (B-band) | 8.0 likes |
Angular expansion | 4.08 ′ × 4.08 ′ |
Central star | |
designation | HIP 3678 |
Apparent brightness | +11.77 mag |
Spectral class | B0 |
Physical data | |
Redshift | +0.000130 |
Radial velocity | +39 km / s |
distance | 2,055 ly (630 pc ) |
Absolute brightness | +11.78 mag |
history | |
discovery | FW Herschel |
Date of discovery | November 27, 1785 |
Catalog names | |
NGC 246 • PK 118-74.1 • GC 131 • H V 25 • h 56 • PN G118.8-74.7 |
NGC 246 is the name for a planetary nebula in the constellation Whale .
properties
NGC 246 is approximately 2000 light-years away and has an angular extent of 4.0 '× 3.5'. The absolute brightness is +11.78 mag, its apparent brightness is 10.9 mag. The nebula is formed by a star in its center in the final stage of its development, which sheds its outer shell. The central star develops into a hot white dwarf .
The planetary nebula NGC 246 was discovered on November 27, 1785 by the German-British astronomer Friedrich Wilhelm Herschel . In the English-speaking world, the object has the common name "skull nebula" because of its rough resemblance to a skull.
Web links
Commons : NGC 246 - collection of images, videos, and audio files
Individual evidence
- ↑ NASA / IPAC EXTRAGALACTIC DATABASE
- ↑ NGC 246
- ↑ a b SIMBAD database, operated at CDS, Strasbourg, France
- ↑ a b The Hipparcos and Tycho Catalogs at ESA
- ↑ Astronomie.de / the meeting point for astronomy. Retrieved August 9, 2020 .
- ↑ NGC 246 and the Dying Star - Astronomy Picture of the Day of April 18, 2006 (English).
- ↑ Seligman