Observation by Paul Leyland: Variables in Messier 33

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Paul Leyland


Paul Leyland


2020 Feb 05 - 21:20


2022 Feb 03 - 12:41


The Triangulum Galaxy (M33)

  • 0.4m Dilworth Relay
  • Starlight Xpress 814 Trius Pro
  • No filter

575 seconds


Tacande Observatory, MPC J22

Target name

Variable stars in M33


Variables in Messier 33

About this image

This image marks the position of 140 variable stars brighter than Sloan g=20.0 taken from Hartman et al., MRNAS Volume 371, page 1405 (2006). It covers only a small (roughly 10 by 8 arcmin) portion of the M33 galaxy.

I do not claim that all are visible and/or resolved on my image (indeed, it doesn't go quite as faint as g=20) but it shows how observers of extragalactic VS can measure them by the bucket load in single image. A 1 to 2 hour integration should yield adequate measurements down to g=20.

There is at least one GC in there too. Finding it is left as an exercise.

Files associated with this observation
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Eric Watkins
Eric Watkins, 2022 Feb 07 - 02:41 UTC


I have some images of M33 which I shall look up together with Hartman et al's paper and see how it compares.


Paul Leyland
Paul Leyland, 2022 Feb 07 - 09:26 UTC

Eric: Good luck.


BTW my image isn't of anything in particular. I just pointed at a random patch of M33 and took an exposure.

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