RE: TRMM orbit

Ed Cannon (ecannon@mail.utexas.edu)
Thu, 19 Mar 1998 17:13:29 -0600

<Ralph.Mcconahy@jpl.nasa.gov> is said to have written:
>
> I have two questions:
>
>       1) Why would TRMM be running 2.5 and 2.25 minutes late using >
>       fairly recent elsets?
>
>       2) Since this is such a bright object, why don't many web sites
>       that have tle's have TRMM in their lists?

It's probably not yet in many lists because it's fairly new
and also fairly low inclination.

Besides other files that were mentioned, it is included in 
the following file, which is updated every day or two, on 
OIG's Web site:

  http://oigsysop.atsc.allied.com/tle/visible.htm

(I presume that they have that file also on their BBS.)  It's 
a group of about 270 from among the brightest objects (not 
including classified ones).

TRMM's in a low, circular orbit (348 km; 218 miles), so it
does experience significant drag.  I presume that they are
boosting it every so often, and that would make it late if
the elements were before a boost.

Ed Cannon
ecannon@mail.utexas.edu
Austin, Texas, USA