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Stewart Sharpless (March 29, 1926 – January 19, 2013) [1] was an American astronomer who carried out fundamental work on the structure of the Milky Way galaxy. As a graduate student at Yerkes Observatory he worked under William Morgan with fellow graduate student Don Osterbrock . [ 2 ]
Sharpless also includes some planetary nebulae and supernova remnants, in addition to H II regions. [ 1 ] In 1953 Stewart Sharpless joined the staff of the United States Naval Observatory Flagstaff Station , [ 2 ] where he surveyed and cataloged H II regions of the Milky Way using the images from the Palomar Sky Survey .
Sharpless 101 (Sh 2-101) is a H II region [1] emission nebula located in the constellation Cygnus. It is sometimes also called the Tulip Nebula because it appears to resemble the outline of a tulip when imaged photographically. It was catalogued by astronomer Stewart Sharpless in his 1959 catalog of nebulae.
Sh 2-308, also designated as Sharpless 308, RCW 11, or LBN 1052, [1] and commonly known as the Dolphin-Head Nebula, is an H II region located near the center of the constellation Canis Major, composed of ionised hydrogen. [2] It is about 8 degrees south of Sirius, the brightest star in the night sky.
Sh 2-1, also known as Sharpless 1, is the combination of a diffuse HII emission nebula and reflection nebula in the constellation of Scorpius with Pi Scorpii at its center. It appears as a modest brightness making it one of the easier Sharpless catalog objects for amateur astronomers to view.
It was included in the second Catalogue of H II Regions, published in 1959 by Stewart Sharpless. [3] Sh 2-185 is located at a distance of approximately 10,500 ly (3.23 kpc ) from the Sun. [ 2 ] The region is surrounded by a dust shell, [ 4 ] and displays several infrared point sources that are a characteristics of young stellar objects .
Sharpless 9 is a red emission nebula that surrounds the star Sigma Scorpii. [2] It is thought the star Sigma Scorpii, a variable giant star, is ionizing this region. [3] It is also recorded as reflection nebula C130. [4] This region is noted as both an emission and reflection nebula, although sometimes only one aspect is noted. [5] [2]
Sh 2-106, [2] also known as the Celestial Snow Angel, is an emission nebula and a star formation region in the constellation Cygnus.It is a H II region estimated to be around 2,000 light years (600 pc) from Earth, in an isolated area of the Milky Way.