Pacman

Sharky

5917994

Deep Sky

Aug 25th, 2026

416

IC 11NGC 281IC 1590

Resolution:: 7166x5260 px
File size:: 39859 KB

Show astrometry on hover

Technical information

Telescope/Lens: Laniakea 425mm f/2.9
Camera: ZWO ASI2600MM PRO
Mount: Skywatcher EQ8-R
Guide Scope: Sky-Watcher Evoguide 50ED
Guide Camera: ZWO ASI178MM
Accessories: Sharpstar 30085NTRD, Ivan7enych FW, ZWO EAF, ZWO Asiair
Software: Pixinsight

Location: Краснодар, Россия

Light pollution

Green, Bortle 4 zone

Date taken: Sep 15th, 2025

Exposure

220 × 120″ · ISO/Gain: 100 · Antlia Highspeed 3nm Ha · Sep 15th, 2025
220 × 120″ · ISO/Gain: 100 · Antlia Highspeed 3nm Oiii · Sep 15th, 2025
220 × 120″ · ISO/Gain: 100 · Antlia Highspeed 3nm S2 · Sep 15th, 2025
30 × 60″ · ISO/Gain: 100 · Antlia V-Pro R · Sep 15th, 2025
30 × 60″ · ISO/Gain: 100 · Antlia V-Pro G · Sep 15th, 2025
30 × 60″ · ISO/Gain: 100 · Antlia V-Pro B · Sep 15th, 2025

Total exposure: 23 h 30 m

Comments

IvanRu

Congratulations on another excellent shot!
I'm curious about the resolution you achieve with your equipment - on average, under good seeing?

Aug 25th, 2026

SharkyReply to IvanRu

Thank you! The minimum was 1.2", but it's hard to say exactly whether the limit was seeing or equipment.

Aug 25th, 2026

IvanRuReply to Sharky

Wow... I thought the lower threshold would be significantly smaller.
And what methodology did you use for the measurement, could you please tell me?
P.S. Practical interest: in the process of refining my own solution for assessing FITS quality.

Aug 26th, 2026

SharkyReply to IvanRu

FWHM, as usual.

Aug 26th, 2026

SharkyReply to IvanRu

And where in Russia could it be less? In theory, somewhere up in the mountains of Arkhyz, sub-arcsecond seeing happens once or twice a year; on the plains or foothills, 1.5" is already quite good, and in the Moscow suburbs, even 2" is far from every night.

Aug 26th, 2026