LBN 251
 | An editor has determined that sufficient sources exist to establish the subject's notability. (August 2026) |
| Nebula | |
|---|---|
 LBN 251 imaged in 2026 | |
| Observation data: epoch | |
| Right ascension | 20h 17m |
| Declination | +41° 54′[1] |
| Constellation | Cygnus |
| Designations | IC 1318A, LBN 251, LBN 078.85+03.60, The Longhorn, Summer Dolphin Nebula, Manatee Nebula, Space Shuttle Nebula |
LBN 251, also known as The Longhorn, is an emission nebula in Cygnus.[2][3] The nebula is dimmer than other nebulae in Cygnus, and is therefore observed primarily through long-exposure photography. It is part of the Cygnus molecular cloud. The nebula is ionized by nearby stars, however it is not itself a star-forming region.[4] The nebula is internally divided into two clouds, divided by cold dust.[5]
References
[edit]- ↑ "LBN 251". SIMBAD.
- ↑ "LBN 251 in Cygnus".
- ↑ "The Longhorn (LBN 251) – (Rouz Astro Reducer-OAG Kit)". Rouz Astronomy. December 29, 2023.
- ↑ Arnold, Sven. "LBN 251 – The Summer Dolphin".
- ↑ Meny, C.; Bouchou, P.; Gabarrot, F.; Ristorcelli, I.; Giard, M.; Serra, G.; Stepnik, B.; Bernard, J.P.; Lamarre, J.M.; Pajot, F. (2001). "PRONAOS submillimeter observations in the direction of the IC1318a Cygnus Nebular Complex" (PDF). ASP Conference Series. 243.
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