Cr350
Open Cluster in Ophiuchus
About
A large, loose open cluster in Ophiuchus. From its Gaia parallax of 2.71 mas it lies about 1,200 light-years away, and SIMBAD links more than 2,000 member stars to it. SIMBAD gives its width as 94.3′ and its visual magnitude as 6.1.
Imaging tips
- At about 94′ (1.6°) it needs a wide field: use a short focal length or a wide lens, or a mosaic.
- Broadband is the right choice for an open cluster; the stars are the subject.
- Best in June and July; it peaks near 41.5° altitude from 50°N.
Facts
- Size
- 94.3′
- Magnitude
- 6.1
- Coordinates
- RA 17h 48.1m, Dec +1° 32′
- Framing, APS-C
- 260–430 mm
- Framing, full frame
- 390–660 mm
- Best months
- Jun, Jul
- Peak altitude
- 42° from 50°N, 57° from 35°N