Open Cluster NGC 7128
History
This open cluster was discovered by William Herschel on 14 October 1787. He classified it as seventh class (pretty much compressed clusters of large or small stars) with the designation VII-40 and the notes: «A cluster of small stars of several sizes. 3 or 4' diameter, pretty rich like a forming one.» [464] John Herschel listed it as h 2130 and noted: «A star 9-10m of a ruby red colour in an oval annulus of small stars 4' diameter.» [466]
Physical Properties
| Designation | NGC 7128 |
| Type | OCL (II3m) |
| Right Ascension (J2000.0) | 21h 43m 57.7s |
| Declination (J2000.0) | +53° 42' 55" |
| Diameter | 4 arcmin |
| Visual magnitude | 9.7 mag |
| Metric Distance | 2.307 kpc |
| Dreyer Description | Cl, S, pRi, has a ruby * 9.5 |
| Identification, Remarks | WH VII 40; h 2130; GC 4701; OCL 218 |
Finder Chart
The open cluster NGC 7128 is located in the constellation Cygnus. On 17 August it in opposition with the Sun and is therefore highest in the sky at local midnight.
