Cometary globules, first observed in 1976, are interstellar clouds with comet-like morphology, consisting of compact, dusty, and opaque heads and long, faintly luminous tails. Unlike most dark clouds, CG's are isolated neutral globules surrounded by a hot ionized medium. Most CG's known are located in the Gum nebula, a large HII region mostly stretching between the constellations of Vela and Puppis. CG13 is a large diffuse globule, with an opaque core surrounded by extended bright rims, and a rather inconspicuous tail. It is associated with a nebulous star, Bernes 136, which is a F star merely passing through the globule. Apo TEC140 (140/f7.2) - FLI Proline 16803 - Ha (180m) L (190m) R (120m) G (60m) B (120m) - Warrumbungle Observatory, Coonabarabran, NSW, Australia
Sh2-54 is an extended bright nebula in the constellation of Serpens that belongs to an extended nebulosity that includes also the Eagle Nebula and the Omega Nebula. The older star population in this region has an average age of 4-5 millions years, and its components are grouped in the open cluster NGC 6604. Apo TEC140 (140/f7.2) - FLI Proline 16803 - Ha (720m) L (210m) R (150m) G (120m) B (120m) - Warrumbungle Observatory, Coonabarabran, NSW, Australia
