You aren’t going to waste the ability of a GoTo capable telescope in this event, are you? Sun doesn’t “move” at the speed of stars.
The movement of the stars from east to west across the sky is caused by the rotation of the Earth. The movement rate is called sidereal rate. The movement of the Sun is slower 35% than the sidereal rate. So, you have to slower the tracking rate of your computerized mount (either an EQ mount or a fork mount).
For a Meade GoTo telescope, you have to change the tracking rate from “Sidereal” to “Custom”. The path will be Setup>Tracking Rate>Custom. As suggested by dick who is always active in modifying Autostar II firmware, the custom rate has to be adjusted to -3 FOR MOST OF THE UNITS. If your autostar controller is either StarGPS patched or dick patch kit patched, you can enter -3.5 for a more precision tracking rate.
For others, the tracking rate is suggested to altered to -3 as well. If this doesn’t work, try to find out another figure around this.
Beware of using an unfiltered telescope to point to the Sun, it will cause severe damage to both of your telescope and your eyes.
Simulation above is courtesy of Larry Koehn. Click to enlarge.
Watch out for this event! This is a great chance for those who have solar telescope or solar filtered telescope who wish to take a memorial photo or observe visually. If you miss this, you are going to wait for another 10 years, i.e., 9 May 2016. Most Americans, Asians (except Indians), Aussies and those who live in the visible area have the chance to enjoy this transit. It starts at 3:12 am GMT+8 on 9 November 2006 and lasts for 5 hours.
You must protect your eyes with solar filter. If you have a telescope, make sure that it has a proper and safe solar filter (I’m going to get Baader Astrosolar Film for my 8″ LX90). Don’t look at the Sun directly, it will severely damage your eyes. For those who don’t have any of the equipments or not lucky enough to be in the visible area, you may visit SOHO on 9 November 2006 for the real time movies.
To know the exact time of the transit happens in your area, please visit NASA - Transit of Mercury 2006.
Mercury transits can occur only in May or November, when the planet crosses the ecliptic plane. And they happen rarely - 13 or 14 times per century.
Recommended Equipments
- Coronado Personal Solar Telescope
- Solar film filtered telescope (I’m getting a Baader)
I would like to know the field of view I can archieve with my scope if I am going to buy an eyepiece, especially a wide angle eyepiece. Apply the formula below, you can get a rough figure of the true field of view (TFOV). Why is it just a rough figure? There are still several factors to be taken account but I think this is good enough. There is a more precise formula to do the same work.
TFOV = AFOV of Eyepiece / Magnification
The apparent FOV (AFOV) of an eyepiece is provided by the manufacturer. To know the magnification, please refer to Calculate Eyepiece Magnification.
Apparent Field of View of Several Eyepiece Designs
Orthoscopic - 43º
Plossl - 50º
Radian - 60º
Panaoptic - 68º
Nagler - 82º
Latest Comments
RSS