Globular cluster M13

Alex Ch

1892985

Deep Sky

May 4th, 2026

379

NGC 6205NGC 6207IC 4617

Resolution:: 3260x1995 px
File size:: 5237 KB

Show astrometry on hover

Technical information

Telescope/Lens: SkyWatcher 150/600 Quattro
Camera: ZWO ASI585MM
Mount: Sky-Watcher HEQ5 PRO
Guide Scope: 60 mm Guide Scope
Guide Camera: ZWO ASI 662MC
Accessories: Zwo Asi Air Plus, СС 0, 85х
Software: Pixinsight, PhotoShop

Location: Новосибирская область, Жеребцово, Россия

Light pollution

Orange, Bortle 6 zone

Date taken: Apr 29th, 2026

Exposure

60 × 30″ · ISO/Gain: 252 · ZWO R
60 × 30″ · ISO/Gain: 252 · ZWO G
60 × 30″ · ISO/Gain: 250 · ZWO B

Total exposure: 1 h 30 m

Comments

poppy8micro

Question: why are there purple spots? I thought it was a color camera issue, and I also noticed such spots from algorithms like Lanczos 3 and 4. When I stack using the bicubic method, there are none.

May 4th, 2026

Alex ChReply to poppy8micro

I can't say what those spots are — I don't see them on the monitor, but they are noticeable on the OLED screen. Maybe the plugin is adjusting the background that way; I've noticed this tendency several times already.

May 4th, 2026

poppy8microReply to Alex Ch

Here is a direct translation into natural English: "It's a real mystery to me."

May 4th, 2026