Messier 13 (M 13)
Introduction | Map | Sketch | My
Observations | References
On this page I collect my observations of the globular star cluster M
13 in the constallation Hercules.
The globular star cluster M 13 in the Hercules constellation
is probably the largest globular cluster in the northern sky. It is located
on the right edge of the Keystone asterism, which is the most prominent
part of the constellation Hercules and forms a trapezoid. M 13 is not quite
round and, depending on the author, 8 'or 15' in size. I was able to see
the bright nucleus well, but I was not able to resolve single stars.
Overall, this cluster is an easy-to-find object, even with binoculars
(for example, on Oct. 31, 2016 in Mühlhausen / Kraichgau
- but only faintly), at least once you have found the Keystone asterism.
Size: 8' / 15' (Stoyan/Karkoschka)
Distance: 24,000 light years (Stoyan)
M 13 is located at the right edge of the Keystone asterism
(1/3 from the top) and is relatively easy to find once you have found the
The sketch by Michael Vlasov (DeepSkyWatch.com)
provides a rough impression of what I observed in Summer/Autumn 2016 (my
impression was much fainter and smaller than the sketch):
of the M 13 globular star cluster by Michael Vlasov (Copyright © Michael
Vlasov 2016) - presented with the author's permission
My Own Observations
Observations Summer to Autumn 2016
- At the end of August 2016, I observed M 13 many times with the Heritage
100P, the Heritage
P130, and the GSD
680 telescopes in various magnifications.
- On September
1, I observed M 13 using the Heritage
100P, on September 7, using the Skymax-102,
and on September 9, using the Heritage
P130, all on the GoTo mount
/ Kraichgau. M 13 was my prime object (and then came M 92...). Whenever
I was not able to find anything else, M 13 always worked!
- At the end of September and the beginning of October 2016, I observed
M 13 with the Heritage
100P in various magnifications and with binoculars in France (Sumène,
Haute Loire). /// End of September/beginning of October 2016: M 13 observed
with binoculars (Trinovid) (Sumène, Haute Loire, France).
- Oct. 31, 2016: M 13 observed with binoculars - but only faintly
Observations February/March 2017
- Feb/Mar 2017, May 2017: M 13 observed with binoculars (Mühlhausen/Kraichgau).
Observations May 2017
I approached M 13 in Mühlhausen / Kraichgau in May 2017 with
the Sky-Watcher Explorer
150PDS on the GoTo mount.
- May 9, 2017 (Mühlhausen: Explorer
150PDS on GoTo mount): M
13 seen through a gap in our balcony
- May 12, 2017 (Mühlhausen: ditto): M 13 seen beautifully
- May 14, 15, 2017 (Mühlhausen: ditto): M 13 and further globular
star clusters seen well (7 mm; 24/16 mm on May 15), all somewhat "resolved",
M 13 was the largest cluster
- May 16, 2017 (Mühlhausen: ditto) M 13 and further globular star
clusters seen well (24/4 mm), all somewhat "resolved", M 13 was
the largest cluster - probably never seen them that well and large (4 mm)
- May 20, 2017 (Mühlhausen: ditto): M 13 seen through a gap in our
balcony as well as M 3 and M 5 - beautifully seen with 4 mm eyepiece (M
53 as well).
Observations September 2017
- Sep 10 or 11, 2017 (Sumène, Haute Loire, France; LT): M 13 nicely
seen with binoculars.
- Sep 13, 2017 (Sumène, Haute Loire, France; LT): M 13 seen
- Probably also seen on other days with binoculars ...
Observations October/November 2017
- Sep 2017 (Sumène, Haute Loire, France; LT): M 13 observed
- Oct 2017 (LT, TS): M 13 observed with both binoculars.
- Nov 13, 2017 (TS): M 13 observed with binoculars.
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