Last night's Gaia talk

[Roy Easto]

Following the excellent talk at the meeting last night on the Gaia
mission and data sets I thought I'd post up some renders I made using
data from the data set of M45.

The data set has distance, position and 3D velocity through space for
all stars in the Pleiades (as well as colour and brightness). From this
it is possible to construct a made up image of the cluster. The cluster
can be viewed from two slightly different positions to give two separate
views side by side and by crossing your eyes (it takes a bit of
practice) you can see a 3D view of the cluster:

https://www.dropbox.com/scl/fi/3wlllzxd23sgrlvhd54p6/m45-3d-gc.png?rlkey=vbcc44cxjyvosksh0pnarjayk&st=to7ev9ur&dl=0

Secondly we can run the cluster forward in time to produce a movie. Note
the stars that are moving too fast are not Pleiads:

https://www.dropbox.com/scl/fi/msfokvh8zb7q189ambm4h/m45.mp4?rlkey=hvxy86j7s38zi8oh0k272xv7h&st=cete38oh&dl=0

Finally we can put the two together to create a 4D movie in time and space:

https://www.dropbox.com/scl/fi/5t4djn1zu9zsrn17052h7/m45-gc.mp4?rlkey=swgbtexvc184br0p99wbi29ia&st=e4n3k248&dl=0

The speaker did mention afterwards that there was a VR headset program
to visualise the Gaia data but he hadn't seen this yet, I could imagine
it could be very cool.

Roy

[drja...@aol.com]

Thanks Roy

Really good to see, most of all the 4D.

Thanks for doing the renders and sharing.  The stereo effect is very clear.   Is it possible to say how long the 15 sec movement takes in reality?

James

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[Roy Easto]

I believe each of the 400 frames is about 180 years apart so it covers a span of 72,000 years. If the stars have relative velocities of the order of 30 miles per second then they would move a light year or so in this time which seems reasonable.

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[drja...@aol.com]

Thanks Roy.  Fascinating to see.

James

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On Sat, 22 Nov 2025 at 18:14, 'Roy Easto' via croydonastro

<croydo...@googlegroups.com> wrote:

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