Messier 22 (M 22)

Introduction | Map | My Own Photos | My Own Observations | References

On this page I collect my observations of the globular star cluster M 22 (NGC 6656) in the constellation Sagittarius.

Introduction

The globular star cluster M 22 is located in the constellation Sagittarius and, according to Stoyan, has a prominent position. It is the brightest and easiest globular cluster to dissolve into single stars for Central European observers - only M 4 is larger.

M 22 (NGC 6656)
Size: 9'/32' (Stoyan/Wikipedia)
Distance: 10,000 light years (Stoyan)
Rating: **** (Stoyan)

Map

M 22 in the constellation Sagittarius and in the context of other nearby DSO; M 28, another globular star cluster, is nearby and to the right of it. (Image Courtesy of SkySafari Astronomy, www.simulationcurriculum.com)

My Own Photos


M 22 - May 29, 2020	M 22 - May 29, 2020, processed	M 22 - May 29, 2020, processed and sharpened

M 22 - Aug 9, 2020, many hot pixels	M 22 - Aug 9, 2020, processed	M 22 - Aug 9, 2020, processed and sharpened

M 22 - Aug 24, 2020, many hot pixels	M 22 - Aug 24, 2020, processed	M 22 - Aug 24, 2020, processed and sharpened

M 22 - Jul 18, 2021, decollimated	M 22 - Jul 18, 2021, processed	M 22 - Jul 18, 2021, processed and sharpened

My Own Observations

Observations September/October 2019

Sep 19, 2019 (Sumène, France: PS 72/432 on AZ Pronto Mount): M 22 (24, 7, 4 mm) beautiful and large, resolved at the periphery; M 28 (24, 7, 4 mm) close to M 22, much smaller.
Sep 20, 2019 (Sumène, France: StarTravel 120/600 on AZ Pronto Mount): M 22 (24, 7, 4 mm) nice and large, resolved from 7 mm on; M 28 (24, 7, 4 mm): close to M 22, much smaller
Sep 28, 2019 (Sumène, France: StarTravel 120/600 on AZ Pronto Mount): M 22 (24, 10, 7, 4 mm) appeared as resolved already at 24 mm, but definitely at 10 mm; M 22 very nice, particularly at 24 and 10 mm.
Sep 30, 2019 (Sumène, France: StarTravel 120/600 on AZ Pronto Mount): M 22 (24, 10, 7, 4 mm) nice, large, resolved at 4 mm

Observations May 2020

May 29, 2020 (Erkerode: eVscope): M 22 photographed (new rectangular format without overlay)
August 5, 2020 (Erkerode: TS binoculars): M 22 observed
August 6, 2020 (Erkerode: TS and LT binoculars): M 22 observed
August 7, 2020 (Erkerode: Skymax-127 on AZ Pronto Mount, TS and LT binoculars): M 22 observed
August 9, 2020 (Mühlhausen: eVscope): M 22 photographed (n.o., r.F.)
August 24, 2020 (Mühlhausen: eVscope): M 22 photographed (n.o., r.F.)

Observations July 2021

July 18, 2021 (Mühlhausen/Kraichgau: eVscope): M 22 photographed (n.o., r.f.), new image size and processing, poor collimation despite new collimation

References

Messier Catalogue - Messier 22: messier.seds.org/m/m022.html
Messier 22 (Wikipedia): en.wikipedia.org/wiki/Messier_22