[Chaos-l] Chaos-l Digest, Vol 87, Issue 21
Robert Nielsen
robertnielsen at nc.rr.com
Mon Feb 27 10:01:00 EST 2012
Terry,
The Horsehead unfiltered? Never. Perhaps if you went to New Mexico somewhere ... but I actually have trouble seeing it in a friend's 20" Obsession with a filter. And it is really, really hard in my 12" Cassegrain.
The trick, I've learned, is what is called "exit pupil". You can have a really big scope, and use the wrong eyepiece and never see it. What you want is to get the maximum amount of light into your pupil, which for people my age is around 5mm (younger folks can get all the way to 7mm I believe). The exit pupil is calculated by dividing the focal length of the eyepiece by the f/ratio of the scope. Since my big scope is an f/10, I need at least a 50mm eyepiece. For an f/7 scope, you would need at least a 35mm eyepiece. And for the really fast f/3.x scopes, you can get all the way down to 15-17mm eyepieces.
Since it is no faint, you need to get the maximum amount of light into your eye. Choose the right eyepiece!
Robert
Sent from my iPad
On Feb 27, 2012, at 8:32 AM, Terry McInturff <tcmzodiac at yahoo.com> wrote:
> Jayme,
> It was great seeing you at the Jordan Lake event and you were doing a fantastic job with the public! Maybe next time I will have the courtesy to extend some assistance to you!
>
> Congrats to the Medoc Mountain group...that sounds unbelievable...I look forward to joining you there in the near future.
>
> A Q for the DSO crowd....what is the smallest scope youve used to see the Horsehead UNFILTERED?
> Terry McInturff
>
> Terry McInturff
> President, Terry C. McInturff Guitars, Inc.
> 223-A North Chatham Avenue
> Siler City, NC 27344 USA
>
> --- On Sun, 2/26/12, chaos-l-request at rtpnet.org <chaos-l-request at rtpnet.org> wrote:
>
> From: chaos-l-request at rtpnet.org <chaos-l-request at rtpnet.org>
> Subject: Chaos-l Digest, Vol 87, Issue 21
> To: chaos-l at rtpnet.org
> Date: Sunday, February 26, 2012, 8:49 AM
>
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> Today's Topics:
>
> 1. Re: [Medoc-mountain-men] Tomorrow observing Medoc (RapidEye)
> 2. Tonight (Allen Davis)
> 3. Skywatching tonight still on at Jordan Lake (Ebenezer Church
> Rec Area) (Sayle, Amy E)
> 4. Re: Skywatching tonight still on at Jordan Lake (Ebenezer
> Church Rec Area) (C Tony Garcia)
> 5. Re: [Medoc-mountain-men] Tonight (RapidEye)
> 6. Horsehead (Allen Davis)
> 7. Re: Horsehead (Tony Garcia)
> 8. Jordan lake (Jayme Hanzak)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sat, 25 Feb 2012 12:49:08 -0500
> From: RapidEye <rapideye.us at gmail.com>
> To: North Carolina Observers That Chase Photons In Medoc Mountain
> State Park <medoc-mountain-men at rapideye.us>
> Cc: "Chaos-l at rtpnet.org" <Chaos-l at rtpnet.org>
> Subject: Re: [Chaos-l] [Medoc-mountain-men] Tomorrow observing Medoc
> Message-ID:
> <CAKxZCtk9Yrm9CkLC50Q-PWdattofvg+YPEwYR3v48JtbEhZ0zA at mail.gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1
>
> On Sat, Feb 25, 2012 at 9:46 AM, Robert Nielsen <robertnielsen at nc.rr.com> wrote:
> > Yep. ?Is that what it takes to get you out observing?
>
> Nah - clear weather is what gets me out.
> The coffee is the whipped cream on top!
> I'll try and remember to bring some hot chocolate K-cups for Jenna and
> any other kids that may show up.
>
> j
>
>
> ------------------------------
>
> Message: 2
> Date: Sat, 25 Feb 2012 14:05:31 -0500
> From: "Allen Davis" <starstorm151 at embarqmail.com>
> To: "'North Carolina Observers That Chase Photons In Medoc Mountain
> State Park'" <medoc-mountain-men at rapideye.us>, <Chaos-l at rtpnet.org>
> Subject: [Chaos-l] Tonight
> Message-ID: <000001ccf3f0$7273e400$575bac00$@com>
> Content-Type: text/plain; charset="us-ascii"
>
> So far, we have Robert, Jason, Michael and Sandi, Jim and Jenna, and I going
> to Medoc to observe. Not too late to join us!
>
>
>
> We will all probably be arriving between 500 and 600pm allen
>
>
>
> E. Allen Davis
>
> starstorm151 at embarqmail.com
>
>
>
> "M'Illumino "I am enlightened
>
> D'Immenso" by the immensity."
>
>
>
> -Ungaretti -Ungaretti
>
>
>
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>
> Message: 3
> Date: Sat, 25 Feb 2012 20:05:11 +0000
> From: "Sayle, Amy E" <sayle at email.unc.edu>
> To: "chaos-l at rtpnet.org" <chaos-l at rtpnet.org>
> Subject: [Chaos-l] Skywatching tonight still on at Jordan Lake
> (Ebenezer Church Rec Area)
> Message-ID:
> <4DA17FECB94A564EAE3B3F6E700F8C931249E81D at ITS-MSXMBS3F.ad.unc.edu>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Hi -
>
> A reminder about skywatching at Jordan Lake (Ebenezer Church Recreation Area) from 6:30-8:30 p.m. tonight (Saturday, Feb. 25). My colleague who's working at the planetarium today said she's been hearing a fair amount of interest from the public about the session, so we hope to see some of you there.
>
> thanks,
> Amy Sayle
> Morehead Planetarium and Science Center
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> ------------------------------
>
> Message: 4
> Date: Sat, 25 Feb 2012 15:39:55 -0500
> From: C Tony Garcia <randomcoffee at gmail.com>
> To: "Sayle, Amy E" <sayle at email.unc.edu>
> Cc: "chaos-l at rtpnet.org" <chaos-l at rtpnet.org>
> Subject: Re: [Chaos-l] Skywatching tonight still on at Jordan Lake
> (Ebenezer Church Rec Area)
> Message-ID: <7D704E5E-E6F6-424F-AABC-96984111F1FD at gmail.com>
> Content-Type: text/plain; charset="us-ascii"
>
>
> I'll be there.
>
> -tonyg
>
>
> On Feb 25, 2012, at 3:05 PM, "Sayle, Amy E" <sayle at email.unc.edu> wrote:
>
> > Hi -
> >
> > A reminder about skywatching at Jordan Lake (Ebenezer Church Recreation Area) from 6:30-8:30 p.m. tonight (Saturday, Feb. 25). My colleague who's working at the planetarium today said she's been hearing a fair amount of interest from the public about the session, so we hope to see some of you there.
> >
> > thanks,
> > Amy Sayle
> > Morehead Planetarium and Science Center
> > _______________________________________________
> > Chaos-l mailing list
> > Chaos-l at rtpnet.org
> > http://rtpnet.org/mailman/listinfo/chaos-l
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> ------------------------------
>
> Message: 5
> Date: Sat, 25 Feb 2012 15:58:09 -0500
> From: RapidEye <rapideye.us at gmail.com>
> To: North Carolina Observers That Chase Photons In Medoc Mountain
> State Park <medoc-mountain-men at rapideye.us>
> Cc: Chaos-l at rtpnet.org
> Subject: Re: [Chaos-l] [Medoc-mountain-men] Tonight
> Message-ID:
> <CAKxZCtnMcGsrT1DDfoO7YZDMbfPOs41u81JZDOo4CZYPy9kCEA at mail.gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1
>
> All loaded and on our way out the door.
> See you guys around 6:00
> j
>
>
> ------------------------------
>
> Message: 6
> Date: Sat, 25 Feb 2012 19:38:55 -0500
> From: "Allen Davis"<starstorm151 at embarqmail.com>
> To: "North Carolina Observers That Chase Photons In Medoc Mountain
> State Park"<medoc-mountain-men at rapideye.us>, chaos-l at rtpnet.org
> Subject: [Chaos-l] Horsehead
> Message-ID: <b5e761f7-950b-4c59-9e2c-bfce4c2ccbf3 at blur>
> Content-Type: text/plain; charset="us-ascii"; Format="Flowed";
> DelSp="Yes"
>
>
> The skies are very transparent here at medoc. We have already seen the hor
> s ehead with the moon up!
> Connected by DROID on Verizon Wireless
>
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> ------------------------------
>
> Message: 7
> Date: Sun, 26 Feb 2012 00:06:27 -0500
> From: Tony Garcia <randomcoffee at gmail.com>
> To: Allen Davis <starstorm151 at embarqmail.com>
> Cc: chaos-l at rtpnet.org, North Carolina Observers That Chase Photons In
> Medoc Mountain State Park <medoc-mountain-men at rapideye.us>
> Subject: Re: [Chaos-l] Horsehead
> Message-ID:
> <CAMKaqHQDeF0sU=9hK2MA00VtnLXn+U9+oX5d44METqtzjtxXWA at mail.gmail.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> great stuff.
>
> the seeing is awful here ( jordan lake ) but the transparency was amazing.
> Lots of wind but still a big crowd.
>
> the view of the Orion nebula here at Jordan lake was off the hook for this
> location in my opinion. The moon and jupiter suffered from the bad seeing,
> which was fine for people who rarely saw this stuff, but the Orion nebula
> was something to see!
>
> The crescent moon was still good, despite the wind, and caught a few nice
> clusters, Andromeda, and the Eskimo nebula was nice - esp for my 6"
> telescope. Good views for the deep space stuff.
>
> If I wasn't under such a crunch this week I would call in sick monday and
> go to Medoc tomorrow night - Sunday night - for a predicted *amazing* night
> of transparent clear, steady perfect skies.
>
>
>
> On Sat, Feb 25, 2012 at 7:38 PM, Allen Davis <starstorm151 at embarqmail.com>wrote:
>
> >
> > The skies are very transparent here at medoc. We have already seen the
> > hor s ehead with the moon up!
> > *Connected by DROID on Verizon Wireless*
> >
> > _______________________________________________
> > Chaos-l mailing list
> > Chaos-l at rtpnet.org
> > http://rtpnet.org/mailman/listinfo/chaos-l
> >
> >
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> ------------------------------
>
> Message: 8
> Date: Sun, 26 Feb 2012 08:49:06 -0500 (EST)
> From: Jayme Hanzak <jhanzak at unctv.org>
> To: chaos <chaos-l at rtpnet.org>
> Subject: [Chaos-l] Jordan lake
> Message-ID: <8ec73158-a20f-47dc-8725-44411066ac78 at zim>
> Content-Type: text/plain; charset="utf-8"
>
>
> Well I didn't see everyone at Jordan lake but the turn out?by the public was wonderful. Morehead
> staff?clicked in some?200 people that showed up to look through the telescopes even with the buffeting
> wind coming in off the lake.
> ?
> As Tony said the skies were great. I had a chance to look at Mercury, Venus, Jupiter and Mars.
> It's nice when you have that many planets to look at.?Mercury was good but we were looking through
> a lot of atmosphere and eventual a tree as it headed to the horizon.??
> ?
> Andromeda and the Orion nebula gave the guest a nice showing. The wind actually helped the viewing
> on M42. The shaking of the scope helped to?define the edges of the nebula.
> ?
> I hope everyone had fun last night, where ever you were.
>
>
> Jayme Hanzak
> CHAOS President
>
> CHAOS
> P.O. Box 3001
> Chapel Hill, NC 27514-0842
> http://www.rtpnet.org/chaos/
>
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>
> End of Chaos-l Digest, Vol 87, Issue 21
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