Sh 2-37

Sharpless 2-37

Emission nebula
H II region
As viewed in 2023
Observation data: epoch
Right ascension	18h 18m 48s
Declination	−19° 45′ 03″ [1]
Distance	5800 [2]   ly
Apparent magnitude (V)	7.7 [3]
Apparent dimensions (V)	19.2' × 14.2'
Constellation	Sagittarius
Physical characteristics
Radius	34 [4]  ly
Designations	Gum 78, IC 1283/4, RCW 153, LBN 47
See also: Lists of nebulae

Sh 2-37, also known by the designation IC 1284, or the common name Twiddlebug Nebula, ^[5] is an emission nebula in the constellation Sagittarius. It is located is the direction of ionizing star cluster Dias 5. It also contains the radio source W 34. ^[6]

It is located near the center of the galaxy, and is partially obscured by dust. Nearby Sh 2-37, which appears mostly red, are two small blue reflection nebulae, known as NGC 6589 and NGC 6590. ^{[7] [8]} SIMBAD notably provides the wrong coordinates for Sh 2-37, giving it the same coordinates as nearby NGC 6590. ^[9]

Discovery

Sh 2-37 was discovered by Edward Emerson Barnard on a photographic plate on 31 May 1892. He initially described it as a 'nebulous star'. ^[10]

References

1. "IC 1283 - HII Ionized region in Sagittarius | TheSkyLive".
2. "Around IC1283".
3. "IC 1284 - Nebula in Sagittarius | TheSkyLive".
4. "Around IC1283".
5. "NGC 6589, VDB 118, GUM 78, HH 180 and IC 1283 - astrophotography by Stardoc".
6. "Sh 2-37".
7. "Sh2-37 - Nebula in Sagittarius".
8. "New General Catalog Objects: NGC 6550 - 6599".
9. "NGC 6589, NGC 6590, Ic 1283".
10. "Galactic Nebula IC 1284 | Deep⋆Sky Corner".