From Newsgroup: alt.astronomy

I set up some web pages showing some TESS images a few years back and
have gotten around to trying to update it to latest images and a few
(very few) extra twiddles to describe what it is you're seeing.

The new page may or may not supercede the old page that generally
showed some "movies" of hour by hour monitoring of super close-ups of
regions of interest in the much larger full images from the telescope.

New page:
<http://kym.massbus.org/TESS/PANORAMA/>

Each "sector" shows the position of the telescope in the sky along
with the positions of the 20 brightest stars. At the bottom each ccd
is laid out in miniature. The ordering is not straightforward and some
rotation of some ccds within some cameras may still be required to get
all alignments correct. The numbers inside each FITS ccd image to
help you do this are "complicated" to boil it down to 1 word.

(If you're new to TESS is basically is a very wide angle camera
composed of 16 2kx2k sensors spread across about 25x95 deg of sky. It
has been wandering around an Earth/Moon orbit since 2017 and is
trained on regions of interest for days or weeks at a time taking
snaps every few seconds. Each of the 16 sensors produces an
astro-format FITS file around 30 MB each containing all the relevant information for that instant. Most of it is online at the STSCI in
some form or other. The images are processed various places to watch
out for planetary crossing of each star in the field. Some of this is available as "light curves" for individual stars; and there are
selected full images for each ccd available online from ~2017 up to
the present).

On the site sector 81 (sometime in 2024) is presently the most
detailed. Sectors 100 and 101 (a few months back) are the latest ones
I have a full panorama for. As I write this more sectors are coming
in. (I think the last one started was 105). Quite a bit of disk space
has been chewed up by all the other random ccd images I've collected
over the past 9y or so and are not represented here. But I'll get
around to replicating some of the other sectors that turned out to be interesting.

I process the indiv ccd images and focus in on the very very dimmest
features detectable. Other people watch the light from the stars in
the images; but it's also fun to watch the space around each star and
the gaps between the stars. There is stuff happening all over. :)
Basically, if the data is good enough to see planets crossing some dim
star then you can probably see asteroids and other junk crossing in
front of 1000s of stars. It also seems there is enough dim light
coming off general debris and dust to read by. TESS images are 24b of
B&W. While there is a documented low-level of time-varying random
noise, you can dig down into the grey levels to reliably see features
visible just above that level and, over time, filter off some of the instant-by-instant noise and dig down a little into the dirt even.

So many of the images displayed at this time seem over-exposed. This
is generally due to the default processing various AI programs have
determined show interesting things. At other times the same algorithm
and parameters gives an image a human being can understand, too. :)

The display will change from time-to-time as I or one of the AI
programs that monitors this dataset gets around to it. Sober requests
are welcome.

--
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