RE: Estimated Orion EFT-1 Elements

From: satrack--- via Seesat-l <seesat-l_at_satobs.org>
Date: Tue, 2 Dec 2014 12:36:53 +0100 (CET)
Hi all,

as suggested by Jon Mikel, I've just uploaded these TLEs on the online 
tracker, including launch and 
decay times. This way it is possible to track Orion EFT-1 in real time as well 
as to predict visibility and 
trajectory of passes (just click on the 'Predict Passes' button under the map)

If someone has information about the expected Std magnitude I can add also the 
computation of 
its brightness.

The tracker is available using this link (as usual, TLEs are automatically 
switched at the right time):

http://www.satflare.com/track.asp?q=eft1

(Thanks Jon for the suggestion and Daryl for sharing the TLEs).

Best regards,
Simone


>----Messaggio originale----
>Da: seesat-l_at_satobs.org
>Data: 29-nov-2014 22.59
>A: <SeeSat-L_at_satobs.org>
>Ogg: Estimated Orion EFT-1 Elements
>
>
>
>I've taken a cut at estimating the orbit elements for this Thursday's Orion 
EFT-1. The TLEs below assume an on-time launch at 4 Dec 12:05:00 UTC (7:05 
EST).  The launch window is 2 hours 39 minutes long.  As near as I can tell 
similar launch windows exist for the next two days, opening ~5 minutes later 
each day.
>
>Most of the reference data for this estimate came from the Orion Flight Text 
1 Press Kit located here:
>http://www.nasa.gov/sites/default/files/files/orion_flight_test_press_kit(1).
pdf
>
>There are two orbits.  An initial low altitude orbit for one rev and then the 
final high apogee orbit to approximate entry conditions from lunar distances.
>
>EFT-1 Initial Orbit: Valid from: 4 Dec 2014 12:22:39 UTC to 14:00:26 UTC
>
>1 99000U 14100A   14338.51572917 -.00000000  00000-0 -00000-4 0   010
>2 99000 028.8000 075.9199 0509717 149.6600 356.5000 15.15120000000010
>
>Initial Orbit visibility opportunities are in Western & Northwestern 
Australia and parts of Indonesia (about 12:57 to 13:04 UTC eclipse entry) and 
Southwestern US & Northwestern Mexico (13:40 eclipse exit to about 13:48 UTC).  
Eastern parts of the US and Mexico visibility areas will be approaching dawn so 
the skies may be bright.  The stack should be fairly bright as the second stage 
is still attached at this point.
>
>EFT-1 Final Orbit: Valid from: 4 Dec 2014 14:05:09 UTC to 16:18:35 UTC
>
>1 99001U 14100A   14338.58690972 -.00000000  00000-0 -00000-4 0   010
>2 99001 028.8000 075.2610 3154860 140.3900 021.9900  9.73703000000010
>
>Final Orbit visibility opportunities are much more widespread due to the much 
higher 5800 km apogee altitude, although at much, much longer range.  
Australia; South, Southeast and Far East Asia (from ~14:40 to 15:26 UTC eclipse 
entry), ranges vary from 6500 to 8000 km).  Hawaii will also have visibility as 
the spacecraft plunges back toward Earth (16:03 eclipse exit to 16:14 UTC, 
range ~3500-1100 km).
>
> 
>
>Daryl
>
>
>
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Received on Tue Dec 02 2014 - 05:37:37 UTC

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