Globalstar status

Philip Chien (kc4yer@amsat.org)
Thu, 5 Feb 1998 01:22:49 -0400

Ron Lee said:


>a)  For each minute delay, add 0.00069444 to the epoch (98036.55694444)
>    This is 1/1440
>
>b)  Add 0.25 to the right ascension (232.0000)


add about 1440 minutes, they decided to scrub the launch due to high winds.
I was thinking on bringing tie-down posts for my car - it is *really* windy
and gusty out there!  So I get to sleep in late.

The official word from Boeing -

>Cape Canaveral Air Station, Fla., Feb. 5, 1998 -- Officials scrubbed
>today's launch of a Boeing Delta II expendable launch vehicle carrying
>four Globalstar satellites due to a forecast of continued high ground and
>upper level winds.
>The four Globalstar satellites remain safe aboard the Delta launch vehicle.
>The launch has been rescheduled for Friday, Feb. 6. The one-hour window
>opens at 8:22 a.m.  EDT.  Weather forecast for Friday is improving
>conditions.

It's a rather unique Delta configuration (4 solid boosters, no third stage,
large fairing) and will have an unusual trajectory.  I don't know if you
had enough details to compensate Ron.

For range safety reasons the initial launch azimuth will be 65 degrees.
After the solids separate about 67 seconds in to the mission the vehicle
will 'dog-leg' (turn left) to the desired flight azimuth (hmmm, where's my
calculator) 44.47 degress so the final orbit will be 52 degrees
inclination.  Deployment altitude is 1247 km. circular and the satellites
will use their own on-board propulsion system to raise the orbits to the
operational altitude of 1414 km.

Here's a Boeing web page with a bunch of info -

http://www.boeing.com/defense-space/space/delta2/Flght_pt.htm


The ultimate Iridium constellation will be 48 satellites - 8 planes with
six satellites per plane, plus 8 spares at TBD locations.


What's especially interesting is the ascent profile for the Zenit-2 launch
vehicles.  Zenit will loft 12 Globalstar at a time to 900 km. orbits.  As
the orbits naturally precess four satellites at a time will be raised to
their operational altitudes.  So they get the equivalent of a multi-plane
launch vehicle without having to use a super-booster or multiple launches.

Other info on the Globalstar web page - http:www.globalstar.com

>From what I've seen of the satellites it doesn't look like the antenna
surfaces will be anywhere close to as shiny as the Iridiums.  ;-)



Philip Chien, KC4YER
Earth News
world (in)famous writer, science fiction fan, ham radio operator,
all-around nice guy, etc.