Collinder 423
Collinder 423 (Cr 423), better known as NGC 6939, is an open cluster in the constellation Cepheus. It lies at a distance of roughly 5,700 light-years. The same open cluster also appears in other catalogues as Her H VI-42, H400 371, Mel 231, OCL 217, SD 100. The Collinder catalogue of 471 clusters, compiled by Per Collinder in 1931, gathers both famous showpieces and obscure groupings such as this one.
The image on this page was taken at the Pollux Observatory in Zuidlaren on 14 September 2023 with the Takahashi FSQ106 ED and a ZWO ASI 1600mm Pro. Total integration time was 2.55 hours. Data was collected through rood, groen, blauw.
Object Data
Collinder:Cr 423
Also known as:NGC 6939, Her H VI-42, H400 371, Mel 231, OCL 217, SD 100
Type:Open cluster
Constellation:Cepheus
Distance:~5,700 light-years
Observation Data
Location:Pollux Observatory, Zuidlaren
Date:14 September 2023
Technical Data
Exposure time:R- 11 x 180 sec
G- 10 x 180 sec
B- 12 x 180 sec
Total: 1.7 h
G- 10 x 180 sec
B- 12 x 180 sec
Total: 1.7 h
Telescope:Takahashi FSQ106 ED
Camera:ZWO ASI 1600mm Pro
Color palette:Natural colour (RGB)
Filters:rood, groen, blauw