Adrian Dening's Stars Over Somerset

    Monday 2nd to Sunday 8th June 2025

     

    The evening of Wednesday 4th, around 11pm, is the optimum time to spot one of those clair-obscur visual effects on the lunar surface.  This time, it's the turn of "Plato's Hook", so named because the shadow of crater Plato's rim creates a curved shape.

     

    At 11pm, a waxing slightly-gibbous Moon will be located towards the south west.  Plato is situated on the northern part of the Moon's surface, on the edge of Mare Imbrium.  The crater itself is about 100Km in diameter.

    If you look towards the east around the same time, any evening next week, try to identify an area of the sky known as the "Summer Triangle" that has its three points marked by the stars Deneb in Cygnus, Vega in Lyra and Altair in Aquila.

    Astronomers love this part of the sky as it contains numerous deep sky targets for your telescope.  Some of them, like the Dumbbell Nebula M27 and Ring Nebula M57 appear in the Charles Messier catalogue.  Others are listed in the New General catalogue and a great one of these to observe with your telescope is called the Blinking Nebula.  The nebula does not blink on and off!  It has a bright centre star and if you use your peripheral vision in the eyepiece to look at the nebula's gas through the side of your eye, you will see it.  Stare towards the centre and the gas of the nebula will seem to disappear as the light from the star overwhelms your eye!

    Sir Patrick Moore liked it so much, he included the nebula in his Caldwell catalogue of interesting objects for amateur astronomers,  where it is listed as number 15.

    www.starsoversomerset.com

    Plato images courtesy of BBC Sky At Night Magazine

    Screenshots courtesy of Stellarium

    Copyright Adrian Dening and Radio Ninesprings 2025

     

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