Mercury Provides a Challenge in the Pre-Dawn Sky

October 15th, 2015

Observers in the northern hemisphere may get a chance to glimpse four planets in the pre-dawn twilight as Venus, Mars and Jupiter are joined by faint Mercury. Unfortunately, it’s not an easy planet to see but those in North America will probably have the best chance of spotting it.

Those in the southern hemisphere may not glimpse it at all but with the other three planets and Regulus shining brightly, there’s still plenty to see. Mars and Jupiter are drawing closer together and will be at their closest in just a few days. Keep your eye on the pair as the distance between them narrows.



All Astronomical Events for October 15th, 2015

07:06 UT – Mercury is at half phase. (50% illuminated, magnitude -0.4, diameter 7.1”. Naked eye, Virgo, pre-dawn sky.)

The constellation Cetus (the Sea Monster) culminates at midnight tonight. (Naked eye, 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.

Astronomical events taken from 2015: An Astronomical Year, available in Kindle and paperback formats from Amazon in the US, Canada and the United Kingdom. Night sky simulations created using Mobile Observatory for Android devices.

2015 An Astronomical Year (Kindle Edition) 2016 An Astronomical Year Paperback Cover 2016 The Night Sky Sights The Astronomical Almanac 2015-2019 Kindle Cover - Deep Sky Observer's Guide

2015: An Astronomical Year

2016: An Astronomical Year 2016: The Night Sky Sights The Astronomical Almanac (2015-2019) The Deep Sky Observer’s Guide

(Kindle & Paperback)

(Kindle & Paperback) (Kindle & Paperback) (Kindle & Paperback)


Amazon – US

Amazon – US Amazon – US Amazon – US Amazon – US
Amazon – UK Amazon – UK  Amazon – UK Amazon – UK

Amazon – UK

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”


One thought on “Mercury Provides a Challenge in the Pre-Dawn Sky

  1. Pingback: The Crescent Moon Greets Saturn with Earthshine | The Astronomical Year

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