Dark Horse (astronomy)
Dark nebula | |
---|---|
Observation data: J2000.0 epoch | |
Right ascension | 17h 21m |
Declination | −21° 07′ |
Apparent dimensions (V) | 10° × 10° |
Constellation | Ophiuchus |
Designations | Great Dark Horse |
The Dark Horse Nebula or Great Dark Horse (sometimes called the Prancing Horse) is a large
central bulge of the Milky Way. The Dark Horse lies in the equatorial constellation Ophiuchus (the Serpent Bearer), near its borders with the more famous constellations Scorpius and Sagittarius. It is a large, visible feature of the Milky Way's Great Rift, uniting several individually catalogued dark nebulae, including the Pipe Nebula. It is visible from Earth only on clear moonless nights without light pollution and with low humidity.[1]
Name
This region of dark nebulae is called Dark Horse because it resembles the side silhouette of a horse and appears dark as compared with the background glow of
apparent size
) groups of dark nebulae in the sky.
Nearby nebulae
The rear of the Great Dark Horse (its rump and hind legs), is also known as the
B59. (The 'B' numbers reference entries in the Barnard Catalogue of dark nebulae.) The Snake Nebula (B72) is by comparison a small S-shaped nebula emerging from the west side of the northern part of the bowl of the Pipe (B77).[2]
Barnard 68 is another named dark patch of molecular gas and dust appearing in the Dark Horse Nebula.
See also
References
- ^ "Saturn riding the Dark Horse". EarthSky. 6 September 2017. Retrieved 2018-06-23.
- ^ "Images taken with RFO's robotic (CCD) telescope". rfo.org. Archived from the original on 22 December 2012. Retrieved 18 November 2012.