Seagull Nebula

Some 3,650 light-years away, in the constellation Monoceros, a cosmic bird spreads its wings across the darkness. The Seagull Nebula is a vast complex of interstellar gas and dust whose "wings" span more than 100 light-years. This cloud of ionized hydrogen glows in deep red, energized by the ultraviolet radiation of the young massive stars born within it.

The heart of the nebula, designated IC 2177, hosts the star HD 53367 — a triple star system whose primary component is a blue giant of spectral type Be, with more than 20 times the mass of the Sun. Its intense radiation ionizes the surrounding gas and lights up the "seagull's head". Within the complex, a distinctive bluish bow shock arc is also visible, created by the runaway star FN Canis Majoris as it plows through the nebula at high speed.

The region encompasses far more than a single nebula: it includes emission nebulae (Sh 2-296 forming the wings), reflection nebulae, dark dust lanes, and several open star clusters including NGC 2335 and NGC 2343. The entire complex is also known as CMa OB1, an association of young massive stars located in the same spiral arm of our Galaxy.

This image is the result of over 22 hours of combined RGB and narrowband HaOIII exposures from Starfront Observatories (Rockwood, Texas), captured between January and February 2026. The IDAS NBZ-II filter isolated hydrogen and ionized oxygen emissions to reveal the rich structural detail of this stellar cloud.