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Re: Larger Solar Spot...
--- In OAFs@y..., "Wagner,Rick [CIS-ADS]" <rick.wagner@e...> wrote:
Sure it's safe. I have a 2x4" welder's glass which I use in frontI'm glad to know that. Better safe than sorry. You explanation makes sense -- the light is already at a safe level before entering your binoculars. Thanks Rick! Where does on get welder's glass anyway? Rol |
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Re: Mike: Cadets are interested......
Mike Wirths
Hi Attilla,
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Oh yes absolutely anyone who wants to come is certainly free to do so, although I think we should limit the no. of scopes set up inside, at least until the Cadets leave. This would make for more manovering room inside. --Mike -----Original Message-----
From: attilla.danko@... <attilla.danko@...> To: OAFs@... <OAFs@...> Date: Thursday, March 29, 2001 4:34 PM Subject: [OAFs] Re: Mike: Cadets are interested...... Mike, is this a public event where you will invite other |
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Re: Mike: Cadets are interested......
Mike, is this a public event where you will invite other
astronomer to bring scopes? Or in general, would you like help? It's your party. -ad "it's a wafer thin starparty" --- In OAFs@y..., "Mike Wirths" <mwirths@s...> wrote: Hi Jean,conflict with any other event? |
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Re: Mike: Cadets are interested......
Mike Wirths
Hi Jean,
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How about April 14th thats a day before last quarter, does this conflict with any other event? --L8tr Mike W -----Original Message-----
From: jean_dorais@... <jean_dorais@...> To: OAFs@... <OAFs@...> Date: Thursday, March 29, 2001 2:11 PM Subject: [OAFs] Mike: Cadets are interested...... Greetings, |
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Mike: Cadets are interested......
Greetings,
I asked around last night at Cadets and I have 14 cadets and 2 staff (plus myself) who REALLY , REALLY want to go out to Equuleus and do some observing....of course the BIG question is WHEN??? You pick a date with good weather ( not asking much, am I?)and we'll supply the kids and staff....as well as one small, itsy bitsy little 8" Newtonian..... Jean" Photon-deprived" Dorais |
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Re: Finderscopes for solar projection?
Wagner,Rick [CIS-ADS]
My only concern is that the image of the sun is focused inside the scope on
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the crosshairs. If they are delicate they may get cooked. Rick -----Original Message-----
From: r.prevost@... [mailto:r.prevost@...] Sent: Wednesday, 28 March 2001 20:58 To: OAFs@... Subject: [OAFs] Finderscopes for solar projection? Just wondering about whether anyone knows if a finderscope can be used safely to project the image of the sun onto paper. Isn't a finderscope like a tiny refractor? It should be able to project a clear enough image of the sun to see sunspots. What I don't know is if such a procedure would eventually damage a finderscope or not. I guess it depends alot on the apeture of the finderscope. One of my books "City Observing" ( Sky & Tel press ) says that inexpenive "refractors" 40mm to 60mm should present no problem. Just be careful not to look through it though. Later, Rol Your use of Yahoo! Groups is subject to |
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Re: Larger Solar Spot...
Wagner,Rick [CIS-ADS]
Sure it's safe. I have a 2x4" welder's glass which I use in front of my
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9x21 binos for quick checks of the sun. A telescope/binocular can't concentrate the light to any greater intensity than that which is coming into the objective. Therefore anything which is safe to look through with the naked eye is also safe in front of the objective. BUT, make sure you fasten it on well and make sure that it covers the whole objective. The optical quality of the filters isn't great but at 9 or 10x it's fine. Rick -----Original Message-----
From: Bruce McGlashan [mailto:mcglashanb2@...] Sent: Wednesday, 28 March 2001 18:33 To: OAFs@... Subject: Re: [OAFs] Larger Solar Spot... snip My wife suggested I haul the finderscope off the scope and look at the sun through it and the welder's glass (glass in front). I didn't try it, because I wasn't sure that's a safe thing to do. Anybody know? snip |
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Re: Finderscopes for solar projection?
Some finderscopes would be damaged by solar projection.
Thats becase the solar image at prime focus will be projected onto the reticle of the eyepice. If the reticle is a plastic crosshair (common) rather than a scribed glass disk, then it could well melt. Check your finderscope by removing the eyepiece. Sometimes the crosshair is removable. If you can take the crosshair out, then a finder may well make an adquate solar projection scope. -ad --- In OAFs@y..., r.prevost@h... wrote: Just wondering about whether anyone knows if a finderscope can beused safely to project the image of the sun onto paper. Isn't a |
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Finderscopes for solar projection?
Just wondering about whether anyone knows if a finderscope can be used
safely to project the image of the sun onto paper. Isn't a finderscope like a tiny refractor? It should be able to project a clear enough image of the sun to see sunspots. What I don't know is if such a procedure would eventually damage a finderscope or not. I guess it depends alot on the apeture of the finderscope. One of my books "City Observing" ( Sky & Tel press ) says that inexpenive "refractors" 40mm to 60mm should present no problem. Just be careful not to look through it though. Later, Rol |
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Re: Larger Solar Spot...
--- In OAFs@y..., "Bruce McGlashan" <mcglashanb2@h...> wrote:
To my bleery eyes (too much programming this afternoon), it looked >I sketched it a few days ago. At that time, the spot seemed horizontally oblong if you included the greyish area around the main black spot itself. There are a number of smaller sunspots as well. The E-W size was about 120" whereas the N-S was only 80". However, if you looked only at the largest dark spot, through the scope, that was oblong in a vertical direction, as you describe it now. I wonder if it has changed much in the last few days? My wife suggested I haul the finderscope off the scope and look atA finderscope concentrates the light maybe 7X. Welder's glass is said to protect unaided eyes. I don't know with certainty, but common sense says "don't do it!" Good call, I'd say. If we go observing soon to a place where I bring my scope, I'd gladly bring my solar filter so you can catch a few glimpses. We'd have to go just a bit earlier.do some solar observing/sketching, then observe the evening & night stuff. Soon, the sun will still be high enough at 6pm to do a bit of solar observing. The Photon Hound |
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Re: The More groups the better!
--- In OAFs@y..., abelll21@y... wrote:
I'll be monitoring for observing opportunities..I'm, in dire need ofYou and most of the North American Continent! ;-) Hi there Marc, be most welcome! I thought that this abell1121 eMail address looked familiar! Very glad to see it again. How's your scope doing - any new equipment? It's going to be time for some Mars sketching very soon. You once expressed some interest in sketching. Have you tried it yet? If you don't have one yet, maybe you'd want to look into getting yourself a red filter, before they all sell out. ( See May Issue Sky & Tel for filter and other details ). Looking forward to the opportunity to share some observing with you soon. Photons Rule! Roland |
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Re: The More groups the better!
Welcome Marc,
I too believe in the multi-party system. I hope you find much astronomy and friends in this little party. clear skies, just after dinner -ad "_Nobody_ expects the Spamish Repetition! ... Spam Spam Spam Spam Spam Spam Spam Spam SPAAAM, Spammity SPAM ..." --- In OAFs@y..., abelll21@y... wrote: Hi All,of some observing! |
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Re: Larger Solar Spot...
Bruce McGlashan
I checked it out this afternoon, with the #14 welder's glass I picked up for
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the Christmas eclipse. Neat! To my bleery eyes (too much programming this afternoon), it looked like a vertically-oblong spot. For anyone with some power, is that what it looked like on closer inspection? {Geez, I should have picked up a solar filter with my new scope.} My wife suggested I haul the finderscope off the scope and look at the sun through it and the welder's glass (glass in front). I didn't try it, because I wasn't sure that's a safe thing to do. Anybody know? BTW, I'm pretty sure that was the first sunspot I've personally observed since 1972, when I was using my department-store 60mm scope and eyepiece sun filter (yes, I dodged that bullet, countless times). That's about all that scope was good for - sunspots and exploring the moon. -----Original Message-----
From: r.prevost@... <r.prevost@...> To: OAFs@... <OAFs@...> Date: March 28, 2001 16:39 Subject: [OAFs] Larger Solar Spot... Richard Taylor send an eMail to RASC members stating that the large |
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Larger Solar Spot...
Richard Taylor send an eMail to RASC members stating that the large
sunspot he observed recently (I observed it as well and posted here), is now near the middle of the sun and is large enough to be seen using just your eyes (through an appropriate solar filter of course). Now's the time, if you have solar filter! Solar max is active again but it won't last forever! ;-) Photons Rule! Rol |
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Re: the sat pic on the main page.
Bruce McGlashan
Neat stuff. Count me as someone who looks at it each time I update the
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page. Not that I understand what I'm seeing, mind. Bruce McGlashan -----Original Message-----
From: attilla.danko@... <attilla.danko@...> To: OAFs@... <OAFs@...> Date: March 26, 2001 23:05 Subject: [OAFs] the sat pic on the main page. I've been playing with the code that generates the satellite |
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Beavers & Cubs Session Saturday at Conroy Pit
Just got confirmation and more details for the session on Saturday at
Conroy Pit. I will prepare a map that I will post tomorrow. The organizer told me: -There are 8 Beavers aged 5 & 6 ( moon likely to be their favourite ) -There are 10 Cubs aged 8 to 10 ( Moon & Saturn prob.) -Their parents would be driving the kids there. -One of the parents has a scope and would join us. ( no idea of name ) -There might be other passerby and car traffic. We are asked if we could possibly set ourselves up by 6:30 pm and then the kids and their parents would arrive around 7pm. For the younger kids they'd be finished at 8pm at the latest. My idea was to set up just beyond the metal car gate ( you'll see when you park there ). That way we would not obstrut traffic and people could see us from the partking area. As of now, Janice, Richard, Attilla and myself have expressed interest. With the extra parent's scope, that should be more than adequate. However, anyone else who's interested would be most welcome as well. Now let's hope the weather's decent for Saturday nite... Sharing the Photons Rol |
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the sat pic on the main page.
I've been playing with the code that generates the satellite
pic on the OAFs mainpage. (I'm not actually sure that anyone uses it, but WTH.) I've tried to indicate which way the clouds are moving. That bizzare blue streak on the image always has one end over ottawa. The streak represents the path along which clouds are moving towards ottawa (at least according to my not-too-brilliant cloud-matching algorithm). I suppose I should draw it as a cute arrow or little chubby iconic faces blowing wind, but I havent figured out how to do such stiff the the graphics library ive got. Usually, that blue streak will approach ottawa from the west, since thats where the weather usually comes from. But when the weather is nasty, clouds can approach from anywhere. Then, the streak may come from the east or curl bizzarely. The algorithm I use wont work when clouds are forming or disipating more than they are being blown around by the wind. Its my hope that the blue streak will tell us if that tasty little clear patch (hypothetical, certainly not tonight) is approaching us or not. If this turns out to be useful, I can add a second streamline for, say eguuleus observatory (assuming I can figure out exactly which pixel it corresponds to). Clear skies bearing 47 Mark 2. -ad |
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