Re: Space Track TLEs

From: John Dormer (
Date: Sat Aug 25 2012 - 01:35:43 UTC

  • Next message: JAY RESPLER: "Re: message from space track regarding bulk tle file"

    With the expected upgrades to the Air Force Space Surveillance System
    coming online sometime around 2017, it is easy to see that the database
    could quickly grow to over 200,000 objects.
    Of course, many of these objects will be invisible to optical mechanisms
    available currently.
    And regarding the slowness of the beta site: they may not be database
    administrators, but rather decent system administrators and developers.
    There are usually subtle tunings to make a database really scream, even
    on already-sufficient hardware. It is also likely that everything is
    currently running on one computer. I know the archived files I have are
    over 100M and I only fetch 262 items mostly-daily. Things like proper
    indices in the database can make all the difference, especially on
    something which is probably several tens of gigabytes or larger.
    On 8/24/2012 7:02 PM, Jonathan McDowell wrote:
    > The performance was slow today. But I gather they are on temporary hardware.
    > When they go live let's hope they get some real machines to run on.
    > One thing to bear in mind: SBSS just came online. I don't know what that will
    > mean in terms of catalog volume, but I'm guessing that in the next few years
    > - or the next decade at the latest - we'll see huge increases in the number of
    > cataloged objects. We saw that happen a few years ago in the asteroid business,
    > and it took some adjusting. People who are currently doing some things manually
    > (like me!) will have no option but to automate. This interface will make it
    > somewhat easier to handle that situation, I believe. And everyone who makes TLE
    > programs is going to have to rewrite them anyway when catalog numbers zoom
    > past 99999 on their way to 1 and then 10 million...
    > jcm
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