In The Dark Nebula Bok

The Saturday Night Globules

In astronomy, Bok globules are isolated and relatively small dark nebulae, containing dense cosmic dust and gas from which star formation may take place.

Bok globules are found within H II regions, and typically have a mass of about 2 to 50 solar masses contained within a region about a light year or so across (about 4.5×1047 m3).
They contain molecular hydrogen (H2), carbonoxides and helium, and around 1% (by mass) of silicate dust. Bok globules most commonly result in the formation of double
or multiple star systems.

 

 

 

 

Its a Sirius distance

Its a Sirius distance

Distance to Earth: 8.611 light years

Close. In astronomical terms.

Sirius is the brightest star (in fact, a star system) in the Earth’s night sky. With a visual apparent magnitude of -1.46, it is almost twice as bright as Canopus, the next brightest star.
The name “Sirius”is derived from the Ancient Greek (Seirios), meaning “glowing” or “scorcher”. The system has the Bayer designation Alpha Canis…

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Its a Sirius distance

Its a Sirius distance

Distance to Earth: 8.611 light years

Close. In astronomical terms.

Sirius is the brightest star (in fact, a star system) in the Earth’s night sky. With a visual apparent magnitude of -1.46, it is almost twice as bright as Canopus, the next brightest star.
The name “Sirius”is derived from the Ancient Greek (Seirios), meaning “glowing” or “scorcher”. The system has the Bayer designation Alpha Canis…

View On WordPress

Its a Sirius distance

Distance to Earth: 8.611 light years

Close. In astronomical terms.

Sirius is the brightest star (in fact, a star system) in the Earth’s night sky. With a visual apparent magnitude of -1.46, it is almost twice as bright as Canopus, the next brightest star.
The name “Sirius” is derived from the Ancient Greek (Seirios), meaning “glowing” or “scorcher”. The system has the Bayer designation Alpha Canis Majoris (a CMa).

What the naked eye perceives as a single star is actually a binary star system, consisting of a white main-sequence star of spectral type A1V, termed Sirius A, and a faint white
dwarf companion of spectral type DA2, called Sirius B. The distance separating Sirius A from its companion varies between 8.2 and 31.5 AU

Sirius features coleyartastro in this image.

Sources

Friday night astronomy feature

Friday night astronomy feature

The California Nebula

NGC 1499 is an emission nebula located in the constellation Perseus. It is so named because it appears to resemble the outline of the US State of California on long exposure photographs. It is almost 2.5° long on the sky and, because of its very low surface brightness, it is extremely difficult to observe visually.

It can be observed with a Hβ filter (isolates the Hβ line at…

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Friday night astronomy feature

Friday night astronomy feature

The California Nebula

NGC 1499 is an emission nebula located in the constellation Perseus. It is so named because it appears to resemble the outline of the US State of California on long exposure photographs. It is almost 2.5° long on the sky and, because of its very low surface brightness, it is extremely difficult to observe visually.

It can be observed with a Hβ filter (isolates the Hβ line at…

View On WordPress

Friday night astronomy feature

The California Nebula

NGC 1499 is an emission nebula located in the constellation Perseus. It is so named because it appears to resemble the outline of the US State of California on long exposure photographs. It is almost 2.5° long on the sky and, because of its very low surface brightness, it is extremely difficult to observe visually.

It can be observed with a Hβ filter (isolates the Hβ line at 486 nm) in a rich-field telescope under dark skies. It lies at a distance of about 1,000 light years from Earth. Its fluorescence is due to excitation of the Hβ line in the nebula by the nearby prodigiously energetic O7 star, xi Persei (also known as Menkib).

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Time for Nebula

Hourglass

The Engraved Hourglass Nebula (also known as MyCn 18) is a young planetary nebula situated in the southern constellation Musca about 8,000 light-years away from Earth. It was discovered by Annie Jump Cannon and Margaret W. Mayallduring their work on an extended Henry Draper Catalogue (the catalogue was built between 1918 and 1924). At the time, it was designated simply as a small faint…

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Time for Nebula

Hourglass

The Engraved Hourglass Nebula (also known as MyCn 18) is a young planetary nebula situated in the southern constellation Musca about 8,000 light-years away from Earth. It was discovered by Annie Jump Cannon and Margaret W. Mayallduring their work on an extended Henry Draper Catalogue (the catalogue was built between 1918 and 1924). At the time, it was designated simply as a small faint…

View On WordPress

Time for Nebula

Hourglass

The Engraved Hourglass Nebula (also known as MyCn 18) is a young planetary nebula situated in the southern constellation Musca about 8,000 light-years away from Earth. It was discovered by Annie Jump Cannon and Margaret W. Mayall during their work on an extended Henry Draper Catalogue (the catalogue was built between 1918 and 1924). At the time, it was designated simply as a small faint planetary nebula.

The Hourglass Nebula was photographed by the Wide Field and Planetary Camera 2 of the Hubble Space Telescope.

Much improved telescopes and imaging techniques allowed the hourglass shape of the nebula to be discovered by Raghvendra Sahai and John Trauger of the Jet Propulsion Laboratory on January 18, 1996. It is conjectured that MyCn 18’s hourglass shape is produced by the expansion of a fast stellar wind within a slowly expanding cloud which is denser near its equator than its poles.

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