Mercury to put in a rare appearance

Unknown Source

12th Nov 1999

Solar maximum is just around the corner, which means that the Sun is peppered with sunspots. Just today there were 5 groups and at least 50 individual spots visible on the surface of our star. Sunspots -- cool areas created by twisted magnetic field lines poking through the sun's surface -- move rather slowly. They're usually visible for about two weeks as they move from east to west with the solar rotation. On Monday, November 15, observers in the Pacific hemisphere can catch a glimpse of a different kind of sunspot -- a black dot that zips across the sun in little more than an hour. It's not really a sunspot; it's Mercury, the nearest planet to the sun!

ABOVE : This white light image of the sun shows several sunspot groups on November 12, 1999. On Monday, November 15, another tiny dark spot will appear briefly near the Sun's northeastern limb when the planet Mercury crosses in front of the Sun.

The transit or passage of a planet across the disk of the Sun is a relatively unusual occurrence. As seen from Earth, only transits of Mercury and Venus are possible. On average, there are 13 transits of Mercury each century. Transits of Venus are even more rare. They occur in pairs with more than a century separating each pair. On 1999 November 15, Mercury will cross the visible disk of the Sun for the first time since 1993. At approximately 2115 UT (4:15 p.m. EST) the black disk of the planet will appear at the Sun's northern limb, about a third of the way around from North to East. These cardinal directions are easy to figure by simply nudging an equatorial mounted telescope back and forth on both axes. The black disk of the planet will be small -- 9.9 arcseconds across -- and blacker than any normal sunspot.

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