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About _Augustus_

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    Telescope Maker

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  • Website URL landersscientific.com
  • Skype zanel386@outlook.com

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  • Location Connecticut
  • Interests Astronomy, amateur telescope making, astrophotography, space exploration, videogames, business

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  1. SpaceX Discussion Thread

    SpaceX has demonstrated supersonic retropropulsion and landing of Falcon 9 boosters. That is almost exactly the same as a propulsive Mars landing...... just not on Mars.
  2. SpaceX Discussion Thread

    I have no doubt he will not meet the dates for either. I think that the cargo runs will be in 2024 and the first crew will be in the 2027-2030 time frame. But what capabilities don't exist exactly????
  3. SpaceX Discussion Thread

    AHAHAHAHAHAHAHAHAHAHAHAHAHAHA His company is a failure. They promised to launch tourists a decade ago, and are still testing their suborbital space plane, which can no longer reach space because it's too heavy. Their orbital rocket cannot use White Knight to launch, and is smaller than Electron. If he wants to upstage Elon, maybe he should actually put real money into his project and re-evaluate his goals.
  4. Secondary mirror is here, and the trusses should get here Tuesday. I ordered a spider as well, but that's going to be a while - it's possible I won't have it until mid-March. That sucks, because I need the spider to determine the OTA balance point......
  5. SpaceX Discussion Thread

    My boss thinks Elon's just a sleazy businessman out to make money. I seriously don't believe that, especially when the man says stuff like this.....
  6. NASA SLS/Orion/Payloads

    That was the original plan. Glad they're reverting back to it.
  7. Okay, so it's been a while! I was in Florida to watch the FH launch and got back a few days ago and neglected this thread. I got back to refiguring on the 11th and noticed that my wooden turntable didn't rotate evenly and wasn't staying level, which I thought was odd. Turns out that it has buckled into a saddle-like shape, probably because it was stored in the garage for a while before I used it. I did get around half an hour or so in before I realized this. I have a new turntable, but I haven't bothered working on the mirror yet since. I did some further Ronchi/Foucault (I sort of understand how to do the latter now) after my work session, and I found the following: The astigmatism is nearly gone. It's still noticeable and distorts the bands a little, but I can now actually read the Ronchi bands and they're not curvy. I rotated the mirror just to make sure it wasn't some sort of coincidence of the astigmatic axis being dead horizontal or vertical, and still saw the same thing. The mirror is slightly overcorrected. I don't know by how much, but doesn't differ a whole lot from the "ideal" patterns for a 16" f/4.9 (I remeasured the ROC to be around 157") on Mel Bartels' Ronchi page, so I'm not too concerned. Why it's not spherical is anyone's guess, but I'm not complaining...... There's a 3" diameter "hole" (depressed zone) at the center of the mirror. I'm not sure how it got there, and I'm not sure if it was there before and I just didn't notice, but since it'll be behind the secondary mirror I don't particularly care. Since the mirror is probably capable of throwing up a good enough image that I can determine the focal point, I've started working on the scope itself. I currently have the mirror box (not the cell or bearings, just the box) finished and am about to move on to the mirror cell.
  8. NASA SLS/Orion/Payloads

    I remember reading somewhere that Boeing could probably build two a year if needed.
  9. NASA SLS/Orion/Payloads

    SLS actually still wins in this category since it has more payload capacity and a cryogenic upper stage, but FH would be a lot better than flying it on an Atlas V.
  10. Use Sigma Dimensions........
  11. SpaceX Discussion Thread

    In Florida now, going to Playalinda on Tuesday. Can't wait!
  12. 1. Nope. 2. I've done some afocal Moon shots with a phone but that's about it (I might be able to get some decent planetary shots, too, but still nothing amazing). Serious planetary AP requires a fancy webcam with a tiny chip and tiny field of view, which without tracking means the target drifts out of the field after a few seconds. Long exposures? Forget it....... 3. No worries, bought an identical new one for $15.
  13. SpaceX Discussion Thread

    I leave for Florida tomorrow morning. Let's go!
  14. So my hot plate self-destructed and I had to buy a new one yesterday. I poured the lap and carved the channels with a hacksaw. Using this thing is an annoying process as it can't overhang the mirror, but I have to be careful not to place it on the mirror too hard, otherwise the edges will chip. I put the mirror on the tester and it's much better than before, but the astigmatism is far from gone.