Astronomy:LBN 251
From HandWiki
| 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
- ↑ "LBN 251". SIMBAD. https://simbad.cfa.harvard.edu/simbad/sim-id?Ident=LBN+251&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id.
- ↑ "LBN 251 in Cygnus". https://www.jthommes.com/MiscAstro/Archives/LBN251.htm.
- ↑ "The Longhorn (LBN 251) – (Rouz Astro Reducer-OAG Kit)". Rouz Astronomy. December 29, 2023. https://rouzastro.com/the-longhorn-lbn-251/?v=0b3b97fa6688.
- ↑ Arnold, Sven. "LBN 251 – The Summer Dolphin". https://svenarnold.com/2026/05/02/lbn-251-the-summer-dolphin/.
- ↑ Meny, C.; Bouchou, P.; Gabarrot, F.; Ristorcelli, I.; Giard, M.; Serra, G.; Stepnik, B.; Bernard, J.P. et al. (2001). "PRONAOS submillimeter observations in the direction of the IC1318a Cygnus Nebular Complex". ASP Conference Series 243. https://www.researchgate.net/profile/Bertrand-Stepnik/publication/234333635_PRONAOS_Submillimeter_Observations_in_the_Direction_of_the_IC1318a_Cygnus_Nebular_Complex/links/61937eeb3068c54fa5ee794e/PRONAOS-Submillimeter-Observations-in-the-Direction-of-the-IC1318a-Cygnus-Nebular-Complex.pdf.
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