Also known as Caldwell 14 or open clusters NGC 869 and NGC 884, ( often designated h Persei and χ Persei, respectively), which are close together in the constellation Perseus. Both visible with the naked eye, NGC 869 and NGC 884 lie at a distance of 7,500 light years.
There are more than 300 blue-white super-giant stars in each of the clusters. The clusters are also blueshifted, with NGC 869 approaching Earth at a speed of 39 km/s (24 mi/s) and NGC 884 approaching at a similar speed of 38 km/s (24 mi/s). Their hottest main sequence stars are of spectral type B0.
Source: https://en.wikipedia.org/wiki/Double_Cluster
- Composition: Astro Pixel Processor,
- Processing: GIMP v2.10.14 + plug-ins (Linux),
- Lights: 24 x 96[s], ISO 1250,
- Flats, Darks, Bias.
