When to photograph M 30
M 30 is a globular cluster in Capricornus, 9′ across at magnitude 7.1. Also listed as NGC 7099.
When to photograph it
From 45° N it never climbs above 30°. It peaks at 22° when it crosses the meridian, low enough that haze and light pollution soften it. It is possible with a clear southern horizon, but hard.
From 35° S the best months are July to September, with up to 9.0 hours of astronomical darkness above 30° in August. It reaches 78° at its highest.
Framing
Its long axis is 9′. It fills 35 to 80% of the short side of an APS-C sensor at about 2090 to 4770 mm, and of a full-frame sensor at about 3210 to 7330 mm.
Filters and the moon
Clusters are broadband targets, but bright ones tolerate some moonlight and light pollution. Short subs keep the brightest stars from clipping. The dark sky calendar shows which nights this month are moon-free where you are.
Plan it for tonight
Dates and times depend on your exact location. The imaging planner shows M 30's altitude through tonight, its transit time and its distance from the moon. For sub length, use the exposure calculator.
Nearby targets
- NGC 7293 Helix Nebula 11.7° away
- M 73 14.4° away
- NGC 7009 Saturn Nebula 14.6° away
- M 72 15.4° away
- M 75 21.8° away
- M 2 22.4° away
Gear that suits M 30
M 30 is 9.0′ along its long axis. These frame it on an APS-C sensor with room to crop.
- Celestron C8 OTA 2032 mm f/10: fills 34% of an APS-C frame's short side View at High Point Scientific
- Celestron EdgeHD 8 OTA 2032 mm f/10: fills 34% of an APS-C frame's short side View at High Point Scientific
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