Distant Barred Spiral with Red Dot

Supernova candidates that I have seen here are typically magenta in color. Would a more distant supernova show up as more red? The apparent placement in the arm is likely happenstance but I would appreciate opinions on if this could be a nova.


1 Like

Here is a second similar red dot but this spiral isn’t barred.

For supernovae, the color depends entirely on when the images in the different filters were taken. If you click on the map and follow the “Single exposures” link in the popup, eg https://www.legacysurvey.org/viewer/exposures/?ra=60.5184&dec=-15.0167&layer=ls-dr9, you’ll see that the RGB image is made by adding together nearly 50 exposures in the g,r,z filters, taken across many years. Supernovae last ~weeks, so if we observe them in only one filter during that time, that’s the color they’ll appear – averaged with all the other exposures.
cheers,
–dustin

1 Like

Well that makes complete sense- thank you Dustin.

No, that is not a supernova but a foreground star from our own galaxy. Because it is visible in 2014 as well in 2018. Supernovae can appear in almost any color. From bright or deep blue to red, green, yellow, orange, pink and magenta. A lot of supernovae have that typical mint green color.

Ine :stars::dizzy:

1 Like

Thank you very much Ine!

1 Like