Sh2-116, also known as the planetary nebula Abell 71 (PK 85+04.1). Originally discovered by George Abell in 1955, it was later included by Stewart Sharpless in his catalogue of H II regions as Sh2-116, illustrating the difficulty of classifying this unusually large and faint object...Read more
Sh2-115 is an extended emission nebula located in the rich star fields of the northern constellation Cygnus, close to the border with Cepheus. It is catalogued as Sh2-115 in Stewart Sharpless' catalogue of H II regions, published in 1959. The nebula lies at an estimated distance of ...Read more
NGC 4490 is a barred spiral galaxy located in the northern constellation of Canes Venatici. It was discovered by William Herschel in 1788 and is catalogued as NGC 4490 in the New General Catalogue. Together with its smaller companion NGC 4485, it forms the interacting galaxy pair Arp 269, included in Halton Arp's Atlas of Peculiar Galaxies...Read more
Located in the northern constellation of Draco, NGC 6543, commonly known as the Cat’s Eye Nebula, is one of the most structurally intricate planetary nebulae known. Discovered by William Herschel in 1786, it gained particular scientific importance in 1864 when William Huggins used spectroscopy to demonstrate that such objects are composed of glowing gases...Read more
Almost one year after the first event documented on this page, a very similar phenomenon appeared again in the night sky and was recorded from my observatory in Àger. During the night of 12 March 2026, my monitoring camera captured the full passage of another luminous spiral slowly expanding across the sky ...Read more
NGC 2467, colloquially known as the “Skull and Crossbones Nebula”, is a vibrant and active star-forming complex situated in the southern constellation of Puppis. First discovered by William Herschel in 1784, this extensive H II region is catalogued under several designations, including Sh2-311, Gum 9 and RCW 16 ...Read more
The supernova remnant SNR G206.9+2.3, a rarely imaged object, is located in the constellation Monoceros, close to the border with Gemini. Its designation follows the standard galactic coordinate system used for cataloguing supernova remnants within the Milky Way. SNR G206.9+2.3 was first identified and characterised in the early 1970s, primarily through radio observations conducted by R. D. Davies...Read more
