Cr333
Open Cluster in Scorpius
About
A faint open cluster in Scorpius. SIMBAD gives it an angular size of about 7′ and a visual magnitude of 9.8, with a proper motion measured in a 2005 study.
Imaging tips
- At about 7′ across it is too small to frame widely: use a long focal length and a fine pixel scale.
- Broadband is the right choice for an open cluster; the stars are the subject.
- Best in June; it peaks near 6° altitude from 50°N, so a southern horizon is needed.
Facts
- Size
- 7′
- Magnitude
- 9.8
- Coordinates
- RA 17h 31.5m, Dec −34° 1′
- Framing, APS-C
- 3460–5770 mm
- Framing, full frame
- longer than 4000 mm
- Best months
- Jun
- Peak altitude
- 6° from 50°N, 21° from 35°N