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, 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
- End of August 2016 (Mühlhausen/Kraichgau: Heritage
100P, Heritage P130,
and GSD 680): Observed M
13 many times in various magnifications.
- September 1, 2016 (ditto: Heritage
100P), September 7, 2016 (ditto: Skymax-102 on
GoTo mount), September
99, 2016 (ditto: Heritage
P130 on GoTo mount):
Observed M 13 with various telescopes.
It was my prime object (and then came M 92...). Whenever I was not able
to find anything else, M 13 always worked!
- End of September, beginning of October 2016 (Sumène, Haute Loire,
France: Heritage 100P, LT binoculars):
13 various magnifications and with binoculars.
- October 31, 2016 (Mühlhausen/Kraichgau: LT binoculars): M
with binoculars - but only faintly seen.
Observations February/March 2017
- Feb/Mar 2017, May 2017 (Mühlhausen: LT): M 13 observed with
Observations May 2017
- May 9, 2017 (Mühlhausen/Kraichgau: Explorer
150PDS on GoTo mount): M
13 seen through a gap in our balcony
- May 12, 2017 (ditto): M 13 seen beautifully
- May 14, 15, 2017 (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 (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 (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 (ditto): M 13 seen
- Probably also seen on other days with binoculars ...
Observations October/November 2017
Observations August 2018
Observations September/October 2018
- Sep 16, 2018 (Sumène, France: PS
Pronto Mount, TS bino, OM21 bino): M 13 only a spot with OM21,
three spots with TS, the center spot "shimmering" = the globular
- Sep 19, 2018 (Sumène, France: PS 72/432, AZ
Pronto Mount): Observed M 13 (and M 31) at the smallest
and largest magnification
- Sep 20, 2018 (Sumène, France: PS 72/432, AZ
Pronto Mount): M 13 (and M 31) seen well again
- Sep 27, 2018 (Sumène, France: diverse
telescopes of the Orion43 group):
M 92 seen well with PS72 and 4 mm, bright and small;
M 13 ditto, but larger
- Oct 5, 2018 (Betz, France: PS 72/432, AZ
Pronto Mount): M 13 und M 92 in Betz (Orion43) seen very good,
stars partly resolved
- Oct 13, 2018 (Mühlhausen/Kraichgau: PS
Pronto Mount): M
13 observed at different magnifications
On this Site