H-NGC2421
Open Cluster in Puppis
About
A rich open cluster in Puppis, listed in the Herschel 400. Distance estimates range from about 6,100 to 9,000 light-years, and published ages from roughly 18 to 80 million years, making it a young cluster.
Imaging tips
- Sources give 6–8′ across, so 2420–4040 mm on APS-C or 3710–6190 mm on full frame frames it with room around it.
- Its stars are mostly magnitude 11 to 13, and at 21.9 mag/arcsec² this is a cluster to shoot in broadband.
- Best around December and January, peaking near 19° from 50°N.
Facts
- Size
- 10′
- Magnitude
- 8.3
- Coordinates
- RA 7h 36.2m, Dec −20° 38′
- Framing, APS-C
- 2420–4040 mm
- Framing, full frame
- 3710–6190 mm
- Best months
- Jan, Dec
- Peak altitude
- 19° from 50°N, 34° from 35°N