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Messier 39 or M39, also known as NGC 7092, is an open cluster of stars in the constellation of Cygnus, sometimes referred to as the Pyramid Cluster. It is positioned two degrees south of the star Pi Cygni [ 7 ] and around 9° east-northeast of Deneb . [ 8 ]
The M39 lens mount is a screw thread mounting system for attaching lenses to 35 mm cameras, primarily rangefinder (RF) Leicas. It is also the most common mount for Photographic enlarger lenses. True Leica Thread-Mount (LTM) is 39 mm in diameter and has a thread of 26 turns-per-inch or threads-per-inch (tpi) (approximately 0.977 mm pitch) of ...
Abt — (for example: open star cluster Abt 1 = Biurakan 4 = Markarian 6 = Stock 7) (at 2:29.6 / +60°39' near the southwestern section of the Heart Nebula in Cassiopeia) AC — Astrographic Catalogue; A.C. — Alvan Clark (double stars) Ac / Ack — Agnès Acker (planetary nebulae) A.G.C. — Alvan Graham Clark (double stars) AGC — Arecibo ...
The Dumbbell Nebula (also known as the Apple Core Nebula, Messier 27, and NGC 6853) is a planetary nebula (nebulosity surrounding a white dwarf) in the constellation Vulpecula, at a distance of about 1360 light-years. [1] It was the first such nebula to be discovered, by Charles Messier in 1764.
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NGC 2359 (also known as Thor's Helmet) is an emission nebula [3] in the constellation Canis Major. The nebula is approximately 3,670 parsecs (11.96 thousand light years) away and 30 light-years in size.
Messier 34 (also known as M34, NGC 1039, or the Spiral Cluster) is a large and relatively near open cluster in Perseus.It was probably discovered by Giovanni Batista Hodierna before 1654 [4] and included by Charles Messier in his catalog of comet-like objects in 1764.
NGC 2467, nicknamed the "Skull and Crossbones Nebula", [3] is a star-forming region whose appearance has occasionally also been likened to that of a colorful mandrill. It includes areas where large clouds of hydrogen gas incubate new stars. [ 4 ]