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About soundwave

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    Star Forming

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  1. Hello everybody! As you all know, the transit of Mercury is coming up, and I'd like to get a solar filter and mount it on one of the cover's caps. However, I have the Skywatcher 250px Flextube, and I was wondering if there is danger in observing the Sun through such an open tube (with a filter on the end-cap). I know that sun rays are pretty much parallel to each other.. so in theory, no stray rays should enter from the side (correct me if I'm wrong here), but what about a passing vehicle that reflects the sunlight or something on that lines? Can any damage be done that way? Just to be on the safe side, I'm gonna cover the tube anyways... but I was wondering about this, and I also would like to raise these questions for other people with open scopes that might be viewing the transit. Thanks! Edit: I'm assuming here that I should move the plastic cover to the front of the telescope for solar viewing. Is that the case?
  2. I needed a parabolic (or spherical) mirror, and that's the only one I had
  3. Yes, according to Wikipedia: A typical application in gas dynamics is the study of shock waves in ballistics and supersonic or hypersonic vehicles. Flows caused by heating, physical absorption or chemical reactions can be visualized. Thus, schlieren photography can be used in many engineering problems such as heat transfer, leak detection, study of boundary layer detachment, and characterization of optics.
  4. Hi all! Long time since I've posted on the forums. Looks like an upgraded system. Nice I just wanted to share something that I think is extremely awesome! I didn't know exactly where to post this... I thought maybe in science, but it's also photography... I dunno. First of all... What is Schlieren Photography? From Wikipedia: "Schlieren photography is a visual process that is used to photograph the flow of fluids of varying density"... In this case -- Air. I watched this great tutorial on YouTube on how to make a homemade Schlieren setup, and it's pretty simple. Unlike the tutorial, which uses a razor blade and a circuit-board for the LED, I just used a bit of aluminium foil and a phone's LED. This is what it looks like professionally: This is what it looks like with my setup - It's me lighting a lighter. My full video (better quality) can be seen here: https://www.youtube.com/watch?v=6BulKfpf35A The dark circle in middle is, of course, the secondary mirror's holder. I placed my hand near the opening of the main tube. Quick setup explanation and simplifications: I placed my extended telescope at one end of the room, and the camera setup at the the opposite end of the room (it's not a big room). I used aluminium foil instead of a razor blade. I used the phone's LED (uncovered) instead of a circuit-board LED. Otherwise, I just followed the linked tutorial. Here is a crappy schematic of the setup: Here is the camera setup: So when the sky is cloudy, here's something you can try out I think it's absolutely amazing. Not "first-time-seeing-Saturn" amazing, but pretty spectacular and interesting! Have fun! - itai -
  5. These all are great images I might try to see if I can arrange bringing the camera and adapter to the guy who is selling the second-hand 200P/EQ5, and maybe try it out on the spot there. (just taking a 5 & 10 min raw exposures to check the tracking accuracy). Hopefully he will be okay with it.
  6. Just a quick and fun picture that I've put together Hopefully there are D&D / Fantasy fans here How exciting were the past few days? So awesome!
  7. There's a volunteer at a certain observatory that asked to print these out and hang them there. Hopefully he/she will actually do it Here is the link to the album itself: http://imgur.com/a/Hyznw There, I update any corrections.. For example, I wrote Arctutus instead of Arcturus in one of the texts, so I fixed it and updated the album. And if/when I make more, I will add them there.
  8. When I found an interesting piece of information, I tried to double-check it on another website. And also tried to get the latest articles on that specific piece of info. Most of the data is from Wikipedia and various articles around the web (from places like space.com). And pieces of info containing properties were also checked on WolframAlpha. Of course not all the info is exactly the same on each source (small variations), and some objects have a large uncertainty (especially in the case of Deneb).
  9. Thank you for the info, everybody. I'm kinda leaning towards not getting the 200P, and delay my AstroPhotography phase-transition for when I can get either a smaller (additional) telescope which is good for AP, or get a more advanced (vx?) mount + scope that can cope nicely with both AP and observations.
  10. Hello, I feel like I want to go deeper into astrophotography (and hopefully a little spectroscopy)... but I also really enjoy looking through a telescope with my own eyes. There is this second-hand Skywatcher 200P EQ5 GoTo (not PDS) that I can buy at about the same price (even a bit lower, perhaps) that I can sell my Skywatcher 200px . Assuming that its condition is good, and that I can't buy it in addition to the one I have, then would it be a good choice? I've read a few older topics about the 200P and astrophotography. I think the agreement was that it's "okay" for not-very-long exposures... I'm assuming that the motors aren't very accurate? I've also read (a while back) that below 10", observational experience takes a big hit, but I don't know how accurate that statement is. I'm trying to figure out the loss in the observational experience, compared to the gain in astrophotography abilities and quality (of the tracking, mostly). If anyone has any insights about the matter, it would be much appreciated Thanks.
  11. Thanks I've been corrected about Arcturus' core. It seems that it has not yet started fusing helium in its core, but is fusing hydrogen in a shell around a degenerate helium core. Eventually the helium core will get dense and hot enough to start fusing that helium. I've updated the Arcturus info (http://i.imgur.com/e29CkuO.jpg), but I can't seem to edit the original post anymore, so hopefully people scroll down
  12. Thanks everybody Beamer3, here are direct links to the images: Arcturus: http://i.imgur.com/Yf0gZvr.jpg Deneb: http://i.imgur.com/0w4umWY.jpg Vega: http://i.imgur.com/ZhF78oV.jpg
  13. I took some photos of Arcturus, Deneb & Vega, and wanted to add some cool facts about each star and now they're more of an infographic. The people over at Reddit's astronomy forum seemed to enjoy them, so I thought I'd share them here as well I made these just for fun and education, so I hope nobody will be too upset that I used some icons that I found on the web. The photos of the stars were taken by me with a 10" Dob and a Samsung NX2000. Single frame for each star, edited in Lightroom. At the bottom of each infographic I added some properties of the star, and a size comparison to our own host star. Updated Arcturus version:
  14. 10" Dob and a Samsung NX2000. ISO 100, 0.3sec.
  15. Last night's Moon. Taken with a 10" Dob and a Samsung NX2000. I also tried to make a mosaic with a barlow lens (6 overlapping frames), but I was not optimally focused, and I had some weird issues when trying to stitch them together, so some features look doubled: http://i.imgur.com/S7ATKzp.jpg Need to check out some moon mosaic tutorial.
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