NGC2158 Open Cluster (散開星団NGC2158)

The real sky is in a bad mood, so I investigated Target with planetarium software.
I thought there was a globular cluster just southwest of the M35 open cluster, but it was a dense circular open cluster.
I started shooting because it was rare, but it took me two nights to collect the one-hour Signal, and there was a gap of ten days during that time.
Even in the same cluster, open clusters and globular clusters are completely different, but some of them have a shape like this globular cluster.

本物の空はご機嫌斜めなので、プラネタリウム・ソフトでTargetの調査。
M35散開星雲のすぐ南西に球状星団が有るんだと思ったら、密度の高い円形の散開星団だった。
珍しいので撮影を開始したが、1時間のSignal集めるのに2晩かかり、しかもその間10日間の間が空いてしまった。
同じ星団でも散開星団と球状星団は成り立ちがまるで異なるが、中にはこんな球状星団みたいな形状になる散開星団も有るんだな。

Place: Backyard East Pattaya (Bortle Class 6, Moon Phase 10.9%)
Shot Date (2Days):6th / Mar / 2022 20:43 (UTC+7) Start
TS RC10 Truss Prime Focus(250mm F/8 f/2000mm)
filter: SVBony LRGB
L:15X120 secs 30 minutes
R:5 X 120 secs 10 miniutes
G:5 X 120 secs 10 miniutes
B:5 X 120 secs 10 miniutes
Total 1hour
Palette: LRGB
Gain: 120, Offset 30,BIN2
CCD: ASI294MM Pro
Mount :iOptron CEM70G
Guide: SVbony 60mm F/4 f/240mm , QHY 290C
Controler:NINA,PHD2 Dithering 5pix, 2 frames each
Pre-Processing APP
Post-Processing PI,PS
Shot By Taro Seki Astropical.uk

NGC2158-LRGB3-Edit01-Finish