According to Avedisova, this nebula is ionised by the B1 Ib supergiant
LS I +59 10 which agrees with the class given by SIMBAD. Russeil also identifies it as the ionising star but gives a B0.2 II giant class.
Russeil combines Sh 2-163, Sh-164 and Sh 2-166 into a single star formation region.
Russeil gives a B0.2 II giant class for this star. [
1]
Russeil combines Sh 2-163, Sh-164 and Sh 2-166 into a single star formation region. [
1] This is a little odd however as she also cites widely varying distance estimates for these nebulae.
Notes
1. ^ Russeil, D., Adami, C., & Georgelin, Y. M. (2007). "Revised distances of
Northern HII regions", Astronomy and Astrophysics, Vol. 470, 161-171.
[2007A&A...470..161R]
2. ^ Russeil, D., Adami, C., & Georgelin, Y. M. (2007). "Revised distances of
Northern HII regions", Astronomy and Astrophysics, Vol. 470, 161-171.
[2007A&A...470..161R]