Tuesday, August 16, 2011

Will you be looking for the asteroid on Tuesday morning? A near miss is expected!?

You need a telescope to see it ,or big binoculars with lenses at least three inches across. It will be tenth magnitude which is more than fifty times fainter than you can see with the naked eye.The wider the lens or primary mirror on a telescope,the fainter you can see. A three-inch has a limit of 11th magnitude,so a 10th magnitude will still look very faint in it and it might not be seen at all if the air isn't very transparent at the time It's nearly one and a half times the distance of the Moon at it's closest approach,and its only a few hundred meters across,so it's extremely faint. You'll need a highly detailed star map to pin-point it,or a computerised drive on the telescope, or you won't have a chance of finding it. If you manage to find it,you can check it's movement against the background stars after half an hour or an hour ,to confirm the sighting.If it's a clear night I'm taking a good quality four-inch refractor out,and 20x80 binoculars,and they will only just be up to the task. Best of luck,everyone,anyway.

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