[Isocops] Hi Gain : IBEX ORbit# 247 v002 Contact Request

[Paul Janzen]

> Paul, attached is a view period report. Can you take a look at the orbit
> (and the orbit before and after if needed) and see if the gain test would
> fit into another timeslot?

I don't have precise times for apogee repoints and thus for the 'ABAB'
timing yet, but in orbit o0247b, the first 'A' period should include
25 May 19:00 - 26 May 02:00, any hour during which would be an adequate
time for a test.

In orbit o0246b, the equivalent timing would be circa 16 May 11:00 - 15:00.

Are either of those times sufficient?


The prime consideration is that IBEX be in the solar wind and not in the
bow shock / magnetosheath, or else we will for sure not get a good CEM D
test (we aren't guaranteed good conditions for a CEM D test ever, but we
can predict when we will only lose).  That's what putting the gain test
into the descending arc this time of year.

It's nice if the Earth isn't in FOV during the gain test, but as long as
the arc doesn't require despinning, which these shouldn't, we can remove
the Earth environs from analysis and continue on just fine.

It's also operationally easiest if we schedule the gain test for when the
CEMs are at 1700V rather than 1780V, but I note that if needed we CAN
generate a gain test "from" 1780V and further, that if needed we could
shift around the 'ABAB' voltage timing to accommodate a specific test.


Paul Janzen.


> ________________________________
> From: Marissa Intelisano [mintelisano at applieddefense.com]
> Sent: Wednesday, April 16, 2014 3:50 PM
> To: Reno, Michelle
> Cc: Ibex Mission Operations; IBEX-FDG; IBEXOPS/ORB; ISOC at New Hampshire; Ken Fairchild; Michelle Reno; Nigel Angold; Sheral Wesley; Tim Perry; Paul Janzen
> Subject: Re: IBEX ORbit# 247 v002 Contact Request
> 
> Unfortunately that whole view period is kind of crappy. If it had to be that VP, the first hour (27 May 11:30-12:30 UTC) is really all I would recommend. Things get worse as the VP progresses. Not sure if it would be feasible to wait on this or not, but we could see how the contact on 4/27 goes (very similar geometry & alt and same station). If it goes okay, then we could leave this one as is, if it goes poorly decide from there... just a thought.
> 
> 
> On Wed, Apr 16, 2014 at 4:41 PM, Reno, Michelle <mreno at swri.edu<mailto:mreno at swri.edu>> wrote:
> Would the contact be better if it was moved earlier or later?
> 
> ________________________________
> From: Marissa Intelisano [mintelisano at applieddefense.com<mailto:mintelisano at applieddefense.com>]
> Sent: Wednesday, April 16, 2014 3:33 PM
> To: Ibex Mission Operations
> Cc: IBEX-FDG; IBEXOPS/ORB; ISOC at New Hampshire; Ken Fairchild; Michelle Reno; Nigel Angold; Sheral Wesley; Tim Perry
> Subject: Re: IBEX ORbit# 247 v002 Contact Request
> 
> Hi Sheral,
> 
> The High Gain Test contact on 5/27 is scheduled very close to the edge of the antenna. I think I got the impression from today's call that it can't really be moved around- is that correct? The other three contacts all look fine.