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  1. tblaxland

    Important State of the Forum Address 2019

    Thanks everyone for their contributions so far :thumbup: Xyon could be a politician for his fund raising skills... The forum should have a bar at the top of the page that shows donation progress against our monthly goal. It should only disappear on the rare occasion that we exceed our goal...
  2. tblaxland

    Problem is down?

    Confirming that the domain has been renewed.
  3. tblaxland

    Important PayPal donations, redux

    No profit = no tax :thumbup: That's an over-simplification, but that's the concept. The ATO has a good couple of hundred pages written on the subject to deal with the details :) Some additional record keeping, yes, but not much more than we ordinarily do as part of normal due diligence anyway...
  4. tblaxland

    Announcement New Moderator: IronRain

    Almost? I thought he was that AI bot you've been working on... Welcome IronRain :cheers:
  5. tblaxland

    Announcement Donation target adjusted

    That's a fair point and there's no need to rush. We could see where we are at the end of next year. Or better yet, my preference would be to do it at 30 June, since I do the accounts for the forum and I have aligned the accounts with the Australian financial year :lol: Personally, I'm glad that...
  6. tblaxland

    Humor Random Comments Thread

    Chris Hadfield ejected from movie theatre for loudly heckling Gravity: :lol: BTW, highest recorded wind speed was in Australia at 408 km/h :blink: That was on an island off the coast - highest on the mainland was 267 km/h. Locally, we had 94 km/h yesterday and it's been an unusually windy...
  7. tblaxland

    Space Shuttle 2.0

    Off-topic posts moved to new thread: Ejecting bombs from bomb bay
  8. tblaxland

    O-F Webcomic #1

    Nice. Looks just like you too :)
  9. tblaxland

    Meet KOI 172.02: The most Earth-like planet found yet.

    There are plenty of arguments for surface water on Venus, possibly less than 3.5 billion years ago, and its insolation is 90 % more than Earth's. Plotting the planet on the figures provided by Heller, Barnes & Laconte plonks the planet right in the middle of the habitable zone for tidal...
  10. tblaxland

    Humor Random Comments Thread

    On a whim, I took the kids to the Powerhouse Museum today. I discovered when I arrived that by good fortune Dr Yi So-yeon was giving a talk about her experiences on TMA-12/ISS/TMA-11. Also, by coincidence, we able able to cap the day off with a rare horizon-to-horizon pass of the ISS reaching a...
  11. tblaxland

    OHM KSC-Missile-Row v2 HI-RES and Default-res FIX

    Because: 1. That would violate the copyright of the authors of those addons. 2. It makes it difficult for the authors of those addons to provide support because they lose control of the versions of their addon that are available.
  12. tblaxland

    Idea What if there was a multiplayer orbiter.

    Please refer to the OMP sub-forum.
  13. tblaxland


    NASA's radiation belt probes named for James Van Allen BY STEPHEN CLARK SPACEFLIGHT NOW Posted: November 9, 2012 7 NASA has renamed two satellites launched in August for James Van Allen, a pioneering astrophysicist who discovered the radiation belts surrounding Earth...
  14. tblaxland

    Humor Random Comments Thread

    I couldn't help but chuckle - from the introduction (emphasis mine): I must say that my expectations of life haven't been markedly changed by that satellite :shrug:
  15. tblaxland

    New Comet C/2012 S1 (ISON)

    I've always had more success getting state vectors from JPL Horizon's and putting those into a scenario, rather than using the orbital elements. Query: Results: 2456202.500000000 = A.D. 2012-Oct-02 00:00:00.0000 (CT) -3.330076566794623E+08 8.529260316982148E+08 1.323505626704913E+08...
  16. tblaxland

    SDK Question createVessel in left handed system rotations

    The surface frame is not aligned with the ecliptic frame. The two frames differ by: 1. The rotation matrix of the planet wrt the ecliptic frame; and 2. The rotation matrix of the surface frame wrt to the planet. The rotation matrix of the planet wrt to the ecliptic can be obtained using the API...
  17. tblaxland

    General Question Nice MJD for a Mars flight?

    Cosmic Train Schedule assumes the source and destination are in coplanar orbits. For other orbits (including Mars, which is inclined about 1.8°), you could use a pork chop plotter: Trajectory Planner Trajectory Optimization Tool v2.1
  18. tblaxland

    Updates Mars Science Laboratory (Curiosity)

    This version shows a label where the heat shield impact occurs: It gives a nice view of Glenelg too. I often wonder where these names come from.
  19. tblaxland

    "Fundamentals of Astrodynamics and Applications" by Vallado

    The law varies from country to country. For the only two countries I have had the motivation to do any significant research into, Australia and US, there should be no issues provided the use is for private, non-commercial use.
  20. tblaxland

    Updates BepiColombo updates

    Interesting paper, including trajectory diagrams: (I suspect the dates, and therefore the trajectories, are now inaccurate but interesting nonetheless).