Page 1 of 2

The Horsehead has been Vanquished

PostPosted: Tue Jan 20, 2015 8:34 pm
by stephen-jones
Between my observational skills, Mark Ferraz's 18" telescope, and an H-Beta filter, we managed to view the Horsehead visually from the dark site last night. Talk about a thrill. It's quite a bit bigger than I expected... I had heard people, including my dad, call it a small object in the past. Who else here has seen the Horsehead visually?

And how in the heck did we get through the whole year 2014 without any posts in the deep sky forum?

Re: The Horsehead has been Vanquished

PostPosted: Wed Jan 21, 2015 2:56 am
by steve-fung
That's my white whale - wait, I don't have an 18" telescope, which is my second white whale...

Re: The Horsehead has been Vanquished

PostPosted: Wed Jan 21, 2015 1:21 pm
by stephen-jones
My dad once said he saw it from the site in his 10"... that was on an exceptional night though, and it was also back in the '80s when the site was darker than it is now.

Re: The Horsehead has been Vanquished

PostPosted: Wed Jan 21, 2015 11:31 pm
by steve-fung
This reminds me of the fun and informative article written by Barbara Wilson, "Magic Horse Head Eyepiece":

http://home.ix.netcom.com/~bwilson2/barbarasweb/MEyepiece.htm

For best contrast with visual observing according to Barbara, the key is to use an eyepiece with a H-beta filter that will produce an exit pupil of approximately 5 mm.

Eyepiece (mm) = exit pupil (mm) x f-ratio

Therefore, to get an exit pupil of 5 mm with a f/5 telescope, you will need a 25 mm eyepiece.

Exit pupil specifications for different filters (and their uses) are specified on Lumicon's website:

http://www.lumicon.com/store/pg/15-LUMICON-Nebula-Filters.aspx

Here's a nice overview of the Horsehead Nebula region with observing hints:

http://www.nightsky.at/Photo/Neb/B33_WN.html

I don't have a H-beta filter, but I do have a Baader UHC-S filter that band passes H-alpha, H-beta, and O-III, which I will try next time to observe at the Dark Site. Hopefully, that will also work with the formula above...

Re: The Horsehead has been Vanquished

PostPosted: Thu Feb 05, 2015 5:12 pm
by mark-ferraz
Gonna need that h-beta I think., and we were using a 13mm ethos at the time :)


Sent from my iPhone using Tapatalk

Re: The Horsehead has been Vanquished

PostPosted: Thu Feb 05, 2015 5:31 pm
by stephen-jones
Don't discourage him Mark. It can be done without the H-Beta... it's just harder

Re: The Horsehead has been Vanquished

PostPosted: Fri Feb 06, 2015 10:55 am
by rene-gedaly
I know. Maybe the time has come for the HAS forums. Cloudy nights is my next add to tapatalk...like this app :-)

Re: The Horsehead has been Vanquished

PostPosted: Fri Feb 06, 2015 10:58 am
by stephen-jones
rene-gedaly wrote:I know. Maybe the time has come for the HAS forums. Cloudy nights is my next add to tapatalk...like this app :-)

Hehe... you might want to practice a bit more with it though. I'm not sure this was the thread you meant to reply to LOL

Re: The Horsehead has been Vanquished

PostPosted: Fri Feb 06, 2015 11:05 am
by rene-gedaly
Oh, yeah? Check the last paragraph of your original post, hehe. Okay, I'll give you that no one is going to expect a reply to the original message.

Re: The Horsehead has been Vanquished

PostPosted: Fri Feb 06, 2015 11:46 am
by stephen-jones
Oh... sorry. My perception of context had moved far beyond my original post. In any case, that question was mainly rhetorical. What I really wanted out of this thread was people's visual Horsehead experiences. Tell us about yours, Rene.