Newly discovered asteroid 2004 FH brushes by Earth
ASTRONOMY NOW REPORT
Posted: March 18, 2004
Since it is so small and passed so close, the apparent brightness of 2004 FH varied tremendously during its few hours of fame, reaching a peak of about visual magnitude +10 by 9 p.m. GMT.
Its apparent path against the stars for an observer situated close to the centre of the British Isles is shown at hourly intervals around the point of closest approach, when it traversed the apparent width of the Full Moon every minute. For an observer watching through a telescope, the motion would be immediately obvious.
Unfortunately for U.K. observers, the viewing prospects were not good. The asteroid skimmed the southwest horizon when at its brightest, and by dusk on March 19th it will have faded to magnitude +20 as it recedes from Earth in the direction of northern Cetus.
Given the orbit now determined for 2004 FH, it appears to belong to the Aten class
of asteroids. It takes nearly nine months to orbit the Sun in a plane close to that
of the Earth. The asteroid is currently near aphelion (furthest from the Sun in its
orbit), but its noticeably eccentric path can take it inside the orbit of Venus.
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