Recent Posts

Pages: 1 ... 8 9 [10]
Annual Star Parties / Re: GSSP 2017 Registration is open
« Last post by Mark on January 23, 2017, 01:22:08 PM »
Signed up!  Who else is going?  I expect I'll be staying out among the gas giants - Jupiter or Saturn.
Annual Star Parties / GSSP 2017 Registration is open
« Last post by richozer on January 23, 2017, 11:24:27 AM »
Greetings TACos,

Registration for GSSP 2017 is officially open.  Go to to reserve your spot!

Dates are June 21 - June 24
Eli Rykoff, KIPAC
SLAC National Accelerator Laboratory

Tuesday, Jan. 31, 2017 at 7:30 PM

Panofsky Auditorium
Science and User Support Building (BLDG 53)

The distribution of galaxies in the universe is patchy. Galaxies are bound together in clusters made of stars, hot gas and invisible dark matter. These galaxy clusters are part of a cosmic web of filaments, nodes and empty voids that has been building up over 13 billion years. How do we observe this structure, and how do we use gravitational lensing and satellite X-ray observations to measure its mass? How do galaxy clusters trace the past expansion of the universe and reveal our future? This lecture will highlight data from the Dark Energy Survey, today’s largest cosmic survey, to answer these questions.

SLAC Research Scientist Eli Rykoff has been weighing the universe for over a decade. He received his PhD from the University of Michigan in 2005, where he built a worldwide network of automated telescopes for following gamma-ray bursts, the most energetic explosions in the universe. After graduating, he transitioned to studying galaxy clusters, which evolve over billions of years rather than fractions of seconds, and did postdoctoral research at the University of California, Santa Barbara and Lawrence Berkeley National Laboratory. Rykoff moved to SLAC in 2012, where he works on galaxy cluster finding and other studies for the Dark Energy Survey and the upcoming Large Synoptic Survey Telescope. He also develops educational astronomy apps for the iPhone and iPad, including CosmoCalc, a full-featured cosmological calculator, and GravLens3, a gravitational lens simulator.

Seating is on a first-come-first-served basis
Annual Star Parties / Re: GSSP 2017!
« Last post by Mark on January 23, 2017, 06:44:36 AM »
Does your posting mean registration is open?
Annual Star Parties / GSSP 2017!
« Last post by John Pierce on January 22, 2017, 09:54:02 PM »
Coming Soon, GSSP 2017!    June 21-25, 2017, at Frosty Acres Ranch
Equipment Discussions / Re: solar finder ideas...
« Last post by Marko on January 21, 2017, 02:28:28 PM »
A small and compact design for wide field scopes (or 100mm binos) is a couple of parallel plates 2" apart with a hole in the one towards the sun and a back plate with foggy plastic.

Your holder with the screws is nice to center things so seems ok as you mention.  Easy to test before eclipse anyway you do it.

the tube is fine as well if you have all the stuff to make it I guess.

Here is the TeleVue design that is the two parallel plates

Equipment Discussions / Re: solar finder ideas...
« Last post by buynoski on January 21, 2017, 07:29:55 AM »
You actually don't need one at all, since you can use the shadow of the telescope itself. Just minimize the area
it covers.  That's almost always good enough to get the Sun into a low-power view, and you can adjust from

Coronado also makes (for a somewhat outrageous $100) a solar finder for solar scopes.  It is essentially
what you have designed, a tube with a translucent screen at one end.
Equipment Discussions / Re: solar finder ideas...
« Last post by John Pierce on January 20, 2017, 08:47:16 PM »
ah, my idea of a tube on a tranlucent disk has been done.

Equipment Discussions / solar finder ideas...
« Last post by John Pierce on January 20, 2017, 08:08:18 PM »
so thinking of the upcoming eclipse, I'm planning on making a safe solar filter for the club's 100mm binocular, which has 25x and 40x eyepieces....

It will need a sun finder, I'm thinking a brass tube, maybe 1/2" diameter and 4-6" long, with a translucent disc 1-2" in diameter superglued to the back... center the shadow of the tube on the disc as seen from behind, perfect.     this disc/screen probably should have a nice sharp black dot right in the middle

Whatcha guys think? 

I can use this mount I made for a laser pointer... 

the binos look like this, they are 45 degree, and take standard 1.25" eyepieces as long as they aren't too fat.   The 40X eyepieces are 14mm ES 82 deg. wide, similar to a Nagler, so the actual field of view is 2 degrees.

I'm thinking of finding some suitable cardboard, and taking a strip thats 6" x the outside circumference of the binoculars body, and using that as a template to cut a end piece, with 2 4" holes and thousand oaks solar film, assembled with gaffers tape :)      this should slip on and off the binos, if its too loose, I could always use wide blue painters tape to secure it.
TAC Visual / Re: Venus/Neptune conjunction, Mars and 96 Aquarii
« Last post by DDK on January 18, 2017, 02:22:59 PM »
We'll mark down your wish for an observing window.
Pages: 1 ... 8 9 [10]