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Recurrent Nova RS Ophiuchi

Thu, 08/12/2021 - 16:27

Hi everyone,

I saw a posting on the Recurrent Nova RS Ophiuchi and decided to image it a couple of nights ago. The resulting image was posted on Astrobin (https://www.astrobin.com/e6xjg7/E/). I did a mouse-over image with one from the DSS database which showed the FOV before the star got brighter. Today I am looking at the posted image and noticed that there was a star in the lower right quadrant of my image that was missing from the DSS image. Not sure what to make of this.

I blinked through the individual capture frames to see if the object was moving. And it didn't seem to.

Perhaps someone could take a look at the Astrobin posting and let me know what they think. The star is relatively easy to spot by just blinking back and forth using the mouse-over function.

Opinions would be appreciated.

Eric

Sebastian Otero
Affiliation
American Association of Variable Star Observers (AAVSO)
Thu, 08/12/2021 - 18:07
High proper motion star

Hi Eric,

It is a high proper motion red dwarf and you are recording it in its current position, which is different than the DSS one from decades ago.

http://simbad.u-strasbg.fr/simbad/sim-id?Ident=G++20-16A&

Also see that the DSS color image appears elongated because the star already moved between the exposures in different colors.

Cheers,
Sebastian