H-NGC1528
Open Cluster in Perseus
About
A rich open cluster in Perseus, found by William Herschel in 1790 and also listed as Collinder 47. Sources put it between 2,500 and 3,100 light-years away. About 165 stars are counted as members, the brightest at magnitude 8.7, and it shows in 10×50 binoculars.
Imaging tips
- Sources give 16–18′ across: 1010–1680 mm on APS-C, or 1550–2580 mm on full frame, frames it.
- NGC 1545 lies about 1.3° to the southeast and Sh2-209, an emission nebula, due west, so a wider lens or a mosaic is needed to include them.
- One imager shot 15 × 4 min luminance and 9 × 2 min per colour channel with an 80 mm refractor, covering a 67′ field.
- Another used 10 × 3 min luminance and 5 × 6 min per colour channel, about 2 hours in all, and planned to retry because the seeing was poor.
- Best in November and December, passing almost overhead (about 89° altitude) from 50°N.
Facts
- Size
- 24′
- Magnitude
- 6.4
- Coordinates
- RA 4h 15.5m, Dec +51° 13′
- Framing, APS-C
- 1010–1680 mm
- Framing, full frame
- 1550–2580 mm
- Best months
- Nov, Dec
- Peak altitude
- 89° from 50°N, 74° from 35°N