Today’s Astronomical Events – June 11th, 2015

Hercules contains two globular clusters – Messier 13, the Great Keystone Cluster and the lesser known Messier 92. Messier 13 is a spectacular sight in small telescopes but don’t forget it’s fainter neighbour. Barely visible with the naked eye under clear dark skies, it is more easily seen with binoculars or a small telescope and contains thousands of stars gravitationally bound into a spherical shape. If you get the chance to observe the cluster, keep in mind it’s nearly 27,000 light years away and at close to 14 billion years old, is almost as old as the universe itself.

(Click on an image to enlarge.)

Images courtesy of Mobile Observatory.



19:39 UT – Mercury is stationary prior to resuming prograde motion. (11% illuminated, magnitude 2.4, diameter 10.8”. Taurus, not visible.)

20:20 UT – The waning crescent Moon passes Uranus. (Uranus: magnitude 5.9, diameter 3.4”. Pisces, pre-dawn sky.)

The globular star cluster M9 culminates at midnight tonight. (Magnitude 8.4. Ophiuchus, all night.)

The globular star cluster M92 culminates at midnight tonight. (Magnitude 6.3. Hercules, all night.)



Events in bold involve objects and/or events that are visible with the naked eye.

All times are in Universal Time (UTC). To convert the time to your timezone, click here.

2015 An Astronomical Year (Kindle Edition) 2016 An Astronomical Year Paperback Cover 2016 The Night Sky Sights The Astronomical Almanac 2015-2019 The Amateur Astronomer's Notebook - Cover

2015: An Astronomical Year

2016: An Astronomical Year 2016: The Night Sky Sights The Astronomical Almanac (2015-2019) The Amateur Astronomer’s Notebook

(Kindle & Paperback)

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Details of all available books across the world can be found here or by visiting the author’s page on Amazon. If you have any comments or questions, please feel free to contact me at astronomywriter “at”

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