The Sharpless Catalog

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Sh 2-31

Also: RCW 146, Gum 75
Coordinates: ( 7.21°, -2.18°)
Distance: 850 pc, Size: 2.0 pc
Source: 1982ApJS...49..183B

[ Find on map | See details ] 		Sh 2-31

Sh 2-29, Sh 2-31, and Sh 2-32 all appear to be part of the same nebula complex although the associated CO velocities suggest that these objects may have quite different distances.

Sh 2-32

Also: RCW 146, Gum 75
Coordinates: ( 7.29°, -2.03°)
Distance: 1800 pc, Size: 4.2 pc
Source: 1982ApJS...49..183B

[ Find on map | See details ] 		Sh 2-32

Sh 2-32 is near a major gamma ray source and numerous X-ray sources and has embedded OB stars. Sh 2-29, Sh 2-31, and Sh 2-32 all appear to be part of the same nebula complex although the associated CO velocities suggest that these objects may have quite different distances.

Sh 2-33

Coordinates: ( 8.34°, 36.35°)
Distance: 110 pc, Size: 1.1 pc
Source: 1995ApJS..101...87L

[ Find on map | See details ] 		Sh 2-33

The faint red glow of the nearby molecular cloud MBM 38.

Sh 2-34

Also: RCW 149, Gum 77a
Coordinates: ( 8.72°, -0.51°)
Distance: 1400 pc, Size: 36.7 pc
Source: 1982ApJS...49..183B

[ Find on map | See details ] 		Sh 2-34

This large diffuse HII region is near the Sgr OB1 association and the Lagoon nebula.

Sh 2-35

Also: Gum 77b
Coordinates: (10.95°, -1.65°)
Distance: 1800 pc, Size: 10.5 pc
Source: 1999PASJ...51..819S

[ Find on map | See details ] 		Sh 2-35

Sh 2-35 is part of a 130 thousand solar mass giant molecular cloud.

Sh 2-36

Coordinates: (11.36°, 36.35°)
Distance: 110 pc, Size: 1.4 pc
Source: 1995ApJS..101...87L

[ Find on map | See details ] 		Sh 2-36

The faint rusty red glow of nearby giant molecular cloud MBM 39.

Sh 2-37

Also: RCW 153, Gum 78
Coordinates: (11.63°, -1.78°)
Distance: 1800 pc, Size: 10.5 pc
Source: 1999PASJ...51..819S

[ Find on map | See details ] 		Sh 2-37

Sh 2-35 and Sh 2-37 are associated with a 130 thousand solar mass giant molecular cloud at a distance of 1800 pc. This may be part of the Sgr OB1 association and is a very active star formation region.

Sh 2-38

Coordinates: (11.89°, 0.79°)
Distance: 2400 pc, Size: 2.1 pc
Source: 2003A&A...397..133R

[ Find on map | See details ] 		Sh 2-38

Sh 2-38 and Sh 2-40 both appear to be embedded in the Sgr OB4 association.

Sh 2-39

Coordinates: (12.40°, -1.10°)
Distance: 4142 pc, Size: 2.4 pc
Source: 2003A&A...397..213P

[ Find on map | See details ] 		Sh 2-39

A potential infrared cluster [BDS2003] 6 has been detected here.

Sh 2-40

Also: RCW 155
Coordinates: (12.72°, 0.35°)
Distance: 2400 pc, Size: 10.5 pc
Source: 2003A&A...397..133R

[ Find on map | See details ] 		Sh 2-40

The massive protostellar object IRAS 18089-1732 is in the same area of sky but is located at a distance of 3600 pc.


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Stewart Sharpless published the second and final version of his famous nebula catalog in 1959. Although astronomers publish articles referring to the Sharpless nebulae almost every month, there seems to be few places on the Internet that bring together information on these nebulae as a whole - unlike, for example, the Messier catalog. This is most likely because the Messier objects are visible to anyone with a pair of binoculars or a small telescope. Most of the Sharpless objects are clearly visible only in photographic plates taken by large telescopes. Fortunately some of these plates have now been digitally scanned and made publicly available.

Many of the brightest and most beautiful Milky Way star formation regions visible from the northern hemisphere are in the Sharpless catalog so the 313 objects it contains are well worth examining carefully. (In fact there are more than 313 objects as subsequent research has shown that some of the Sharpless nebulae consist of more than one object.) Although the Sharpless catalog is only intended to be complete for objects visible north of declination -27 degrees, a similar catalog covering the southern hemisphere was published by Alex Rodgers, Colin Campbell, and John Whiteoak in 1960, which is largely an expansion of Colin Gum's earlier catalog. You can visit a gallery of these RCW nebulae here. At least 50 objects in the Sharpless catalog are also in the RCW catalog and I have noted this in the descriptions of these objects.

These images were created using the POSS-II/UKSTU data of the Digitized Sky Survey and SuperCOSMOS using the process described here.

According to my correspondence with the Royal Observatory Edinburgh and the Space Telescope Science Institute, I am allowed to use the POSS-II/UKSTU data to create and display images for non-commercial purposes so long as I include this fine print for the SuperCOSMOS data:

Use of these images is courtesy of the UK Schmidt Telescope (copyright in which is owned by the Particle Physics and Astronomy Research Council of the UK and the Anglo-Australian Telescope Board) and the Southern Sky Survey as created by the SuperCOSMOS measuring machine and are reproduced here with permission from the Royal Observatory Edinburgh.

and this acknowledgement taken from the DSS site:

The Digitized Sky Surveys were produced at the Space Telescope Science Institute under U.S. Government grant NAG W-2166. The images of these surveys are based on photographic data obtained using the Oschin Schmidt Telescope on Palomar Mountain and the UK Schmidt Telescope. The plates were processed into the present compressed digital form with the permission of these institutions.

The Second Palomar Observatory Sky Survey (POSS-II) was made by the California Institute of Technology with funds from the National Science Foundation, the National Geographic Society, the Sloan Foundation, the Samuel Oschin Foundation, and the Eastman Kodak Corporation.

The UK Schmidt Telescope was operated by the Royal Observatory Edinburgh, with funding from the UK Science and Engineering Research Council (later the UK Particle Physics and Astronomy Research Council), until 1988 June, and thereafter by the Anglo-Australian Observatory. The blue plates of the southern Sky Atlas and its Equatorial Extension (together known as the SERC-J), as well as the Equatorial Red (ER), and the Second Epoch [red] Survey (SES) were all taken with the UK Schmidt.

The "Second Epoch Survey" of the southern sky was made by the Anglo-Australian Observatory (AAO) with the UK Schmidt Telescope. Plates from this survey have been digitized and compressed by the ST ScI. The digitized images are copyright © 1993-5 by the Anglo-Australian Observatory Board, and are distributed herein by agreement.

The "Equatorial Red Atlas" of the southern sky was made with the UK Schmidt Telescope. Plates from this survey have been digitized and compressed by the ST ScI. The digitized images are copyright © 1992-5, jointly by the UK SERC/PPARC (Particle Physics and Astronomy Research Council, formerly Science and Engineering Research Council) and the Anglo-Australian Telescope Board, and are distributed herein by agreement.

The compressed files of the "Palomar Observatory - Space Telescope Science Institute Digital Sky Survey" of the northern sky, based on scans of the Second Palomar Sky Survey are copyright © 1993-1995 by the California Institute of Technology and are distributed herein by agreement. The compressed files of the "Palomar Observatory - Space Telescope Science Institute Digital Sky Survey" of the northern sky, based on scans of the Second Palomar Sky Survey are copyright © 1993-1995 by the California Institute of Technology and are distributed herein by agreement.