| Nebula | |
|---|---|
 | |
| Observation data:J2000epoch | |
| Right ascension | 20h 01m 53s |
| Declination | +33° 29′ 26″ |
| Distance | 6700[1] pc |
| Apparent magnitude (V) | 11.4 |
| Apparent dimensions (V) | 0.63' x 0.63'[2] |
| Constellation | Cygnus |
| Designations | GC 4536, h 2062, Sh 2-99, Sh 2-100, PGC 3517682 |
| See also:Lists of nebulae | |
NGC 6857 is anemission nebula andstar-forming region[3] located in the constellationCygnus. It is located in thePerseus Arm of theMilky Way galaxy.[4]
It was discovered byWilliam Herschel on 6 September 1784. It was later observed byJohn Herschel, who believed it to be a star cluster. He described it as "A small bunch of very minute Milky Way stars, so small as almost to look nebulous; north preceding is another."Rudolph Minkowski would conclude in 1946 that NGC 6857 was a nebula.
The nebula is divided into two parts. The two parts are designated at Sh 2-99 and Sh 2-100.[5] It visually resembles aplanetary nebula.[6]
Despite not being a galaxy, aPGC number was assigned to it byHyperLEDA.[7]
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