Re: TS Obs 2022-10-06/07

From: Tomi Simola via Seesat-l <seesat-l_at_satobs.org>
Date: Sat, 8 Oct 2022 18:19:05 +0300
Hi Cees,

Thank you for your insightful write-up! I will try these directions in the
next few nights.

Cheers,
Tomi

On Sat, Oct 8, 2022 at 1:44 PM C. Bassa <cgbsat_at_gmail.com> wrote:

> Hi Tomi,
>
> Thanks for sharing your observations.
>
> On Fri, Oct 7, 2022 at 5:56 PM Tomi Simola via Seesat-l
> <seesat-l_at_satobs.org> wrote:
> > After a long cloudy period I finally had a clear night. Only three
> > observations of two classifieds. I have to find a better part of the sky
> > for better "traffic". Learning by doing!
>
> The best approach to capture more satellites is to observe at lower
> elevations above the horizon. The satellites will be at larger
> distances, and hence fainter, compared to observing them close to
> zenith, but they also move slower, so the integrated brightness in a
> video camera is still comparable, simply because the satellites move
> slower and spend more time illuminating a camera pixel. From
> experience I've found that between 30 and 50 degrees elevation works
> well. You also have the added advantage that as the satellites move
> slower, they spend more time in your field-of-view, so you can measure
> more positions and cover more of the satellites' orbit.
>
> On top of that, several of the classified satellites operating in
> constellations with a shared orbital altitude and orbital inclination,
> and as a result, they can be observed at different parts of your local
> sky more often than in other parts. When projecting the satellite
> subpoint on Earth, you'll find that it will spend fractionally more
> time near the latitudes close to the positive and negative value of
> the inclination. As a result, they will spend more time in those parts
> of the sky where the inclination at that orbital altitude is projected
> onto the sky. For my location near 53 deg North, the Starlink
> satellites in the 53 deg orbits have that overdensity for a line
> running basically West to East through my zenith.
>
> Of the classified satellites, the NOSS objects have such an
> overdensity that is well placed for your latitude. These satellites
> are at ~1100km in 63.4 deg inclination orbits, which means that the
> overdensity is high in your sky at 60 deg North. Good locations to
> point your camera are near 62 deg azimuth (ENE) or 298 deg azimuth
> (WNW) between 30 and 40 deg elevation.
>
> Regards,
>      Cees
>
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Received on Sat Oct 08 2022 - 10:20:41 UTC

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