Astronomy Now Home
Home Magazine Sky Chart Resources Store

On Sale Now!



The August 2014 issue of Astronomy Now is on sale! Order direct from our store (free 1st class post & to UK addresses). The Astronomy Now iPad/iPhone editions are now available worldwide on the App Store.



Top Stories



Earthshine used to test life detection method
...By imagining the Earth as an exoplanet, scientists observing our planet's reflected light on the Moon with ESO's Very Large Telescope have demonstrated a way to detect life on other worlds...
  READ MORE

Solid buckyballs discovered in space
...Astronomers using NASA’s Spitzer Space Telescope have detected a particular type of molecule, given the nickname “buckyball”, in a solid form for the first time...
  READ MORE

Steamy water-world gets the Hubble treatment
...Hubble Space Telescope observations of a 7 Earth-mass planet find an unusual water-rich world swathed in a thick, steamy atmosphere...
  READ MORE








Mercury in the evening
MARK ARMSTRONG
ASTRONOMY NOW
Posted: 02 March 2012


Bookmark and Share

Mercury is now at its best in the evening sky for us in the UK in 2012 and there’s never been a better time to track down the often-elusive innermost planet. Mercury reaches greatest elongation east from the Sun (18°) on 5 March but it will be visible in the western sky until around the middle of March and then be swallowed up by the twilight.


Open larger image. Early March sees a great opportunity to observe elusive Mercury shortly after sunset. The presence of Venus and Jupiter too makes for a great photo-opportunity. Graphic made using the Sky version 5. www.bisque.com

As soon as the sky has darkened sufficiently and the Sun has definitely set then look for Mercury – on 5 March the Sun sets around 5.45pm and the end of civil twilight occurs at 6.20pm, so that’s a good time to spot it, although it will be visible slightly earlier than that with optical aid. Mercury will be a healthy ten degrees above the western horizon below the blazing pair of Venus and Jupiter. One way of estimating how far up in the sky Mercury will be is to hold your hand out westwards with your fingers spread. The average span between the tip of your little finger to your thumb is 18 degrees.

Mercury will be quite bright, fading from magnitude -0.66 on 2 March to -0.26 on 5 March. Through a telescope its phase will decrease from 58 percent to 8 percent as its apparent diameter grows from 6.8 arcseconds to almost 10 arcseconds at the end of its visibility for this apparition. By mid month (15th) it will be much fainter at around mag. +2.5 and very difficult to spot, a mere four degrees up at the end of civil twilight.

There’s very little in the way of surface marking that are readily visible on Mercury but if the seeing is good and you have a moderate aperture then you may be lucky. The whole scene in the western sky after dark in early March is very picturesque, with Jupiter and Venus prominent. If you have a clear western horizon or can travel to get one then why not try some simple snap shots with your digital SLR camera – Astronomy Now will be delighted to receive your images! Mercury passes through inferior conjunction on 20 March.

The Planets
From tiny Mercury to distant Neptune and Pluto, The Planets profiles each of the Solar System's members in depth, featuring the latest imagery from space missions. The tallest mountains, the deepest canyons, the strongest winds, raging atmospheric storms, terrain studded with craters and vast worlds of ice are just some of the sights you'll see on this 100-page tour of the planets.
 GET YOUR COPY

Hubble Reborn
Hubble Reborn takes the reader on a journey through the Universe with spectacular full-colour pictures of galaxies, nebulae, planets and stars as seen through Hubble's eyes, along the way telling the dramatic story of the space telescope, including interviews with key scientists and astronauts.
 GET YOUR COPY

3D Universe
Witness the most awesome sights of the Universe as they were meant to be seen in this 100-page extravaganza of planets, galaxies and star-scapes, all in 3D!
 GET YOUR COPY


HOME | NEWS ARCHIVE | MAGAZINE | SOLAR SYSTEM | SKY CHART | RESOURCES | STORE | SPACEFLIGHT NOW

© 2014 Pole Star Publications Ltd.