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Achernar
Post Laureate
Reged: 02/25/06
Posts: 3837
Loc: Alabama, USA
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Re: Horsehead
05/18/08 09:36 AM
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A hydrogen beta filter is the one to use on the Horsehead and the emission nebula it's in front of, IC-434. It will make it visible, but unless you are looking through a 16 or 18-inch telescope from a dark site, it will not be very prominent with or without the filter. In my 10-inch B-33 looked more like a vague dark shape that kinda looked like a horse's head. Without the filter, I had a hard time seeing just IC-434 with my 10-inch and that was from a dark site. The Horsehead really benefits from larger apertures, but it is not impossible to see if you have a modest telescope like most folks do. Unless the moon is absent and the sky very dark and clear, I wouldn't bother with this object. It's reputation for being tough to see is well placed.
Taras
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10-inch F/4.5 Discovery Dob
6-inch F/8 Homebuilt Dob
4 1/4-inch F/4 Homebuilt reflector
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