› Forums › Spectroscopy › Nova in M31 › Thanks Nick
30 November 2018 at 10:00 pm
#580305
![](https://britastro.org/wp-content/uploads/2018/11/picture-3061-1543586337-80x80.jpg)
Participant
I have the centroid at radius 3.
These are values I get when I change the radius:
centroid | magn. |
radius | |
1 | 18.0 |
2 | 16.9 |
3 | 16.5 |
4 | 16.5 |
5 | 16.4 |
6 | 16.3 |
7 | 16.2 |
8 | 16.2 |
At radius 3 it looks like all of the nova is in the circle.
I am never sure what is best.