IC4665 "Summer Beehive Cluster"

Posted: May 15th, 2021

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NGC

Technical Info

Telescope/Lens: Jupiter-21M 200mm

Camera: Canon EOS 550D

Mount: EQ5 with DIY Arduino controller and guiding

Guide Scope: Jupiter-37A 135mm

Guide Camera: Datyson T7C

Software: APT + PHD2, DeepSkyStacker 4.2.2, FITSWork 4

Exposure:

34 x 120" ISO/Gain: 800

Orange zoneLight Pollution:

Odesa, Ukraine

May 14th, 2021

1 h 8 m

1772

IC4665
"Summer Beehive" / "Літній Вулик" / "Летний Улий"

Lens aperture: f/5.6
Darks: 120s x 20 @ ISO 800
Offsets/Bias: 1/4000s x 30 @ ISO 800
Guide scope lens aperture: f/3.5

Open star cluster in the Ophiuchus constellation, right near the β Ophiuchus star (named Cebalrai). The DEC guiding let me down a bit...

Cebalrai – from the Arabic "كلب الراعي kalb al-rā‘ī" – "the shepherd's dog". (@ https://en.wikipedia.org/wiki/Beta_Ophiuchi).

Resolution: 4781x2945 px

Scale: 18582 KB