Discovery of a new variable star in the field of Messier 33

We report the discovery of a new variable star in the field of Messier 33, part of an ongoing survey program.

Messier 33, with a couple of satellite trails.

Messier 33, with a couple of satellite trails.

As part of our survey of the Messier 33 galaxy, we spotted a new, faint variable star on images taken on 10 and 11 Sept. 2023, with the same object not visible on 7 Oct. 2023 frames.

Messier 33 is a very well know spiral galaxy, placed at about 2.8 millions of light years: it is the third-largest member in our Local Group of galaxies, dominated by the Andromeda Galaxy and the Milky Way.

The new variable star is visible in the animation below, making clear its brightness variation (other known variables are visible in the animation).

The new variable star in the field of Messier 33

The new variable star in the field of Messier 33

The source is placed at the following J2000. coordinates:

2023 09 11.879632 01 34 22.44+30 38 34.8          Mag. 19.2 R

At the position above a very blue, faint source (with no flags of variability) is present in the Pan-STARRS Consortium DR1.

This discovery comes after the one of two other new variables in the same field we reported last month.

These first results indicate how much can be done, even on a very well covered target as Messier 33, with the right imaging setup and a very good sky as the one in Manciano, Italy.

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