This is IC 417, sometimes called the
Spider nebula. Sharpless 2-234 and 2-237 are together sometimes called
the Spider and the Fly.
IC 417 surrounds the star cluster
Stock 8. Avedisova gives two ionising stars:
HD 35619 (O7V) and
BD +34 1054 (B0 IV). SIMBAD gives O9.5V for this second star.
Sh 2-231 to Sh 2-235 form a complex of HII regions located together in the Perseus arm in the outer galaxy. This complex may be associated with an old (330 thousand years) supernova remnant,
FVW 172.8+1.5.
Details on Stock 8. [
1]
Sh 2-231 to Sh 2-235 form a complex of HII regions located together in the Perseus arm in the outer galaxy. This complex may be associated with an old (330 thousand years) supernova remnant,
FVW 172.8+1.5. [
2]
Notes
1. ^ Jose, Jessy, Pandey, A. K., Ojha, D. K., et al. (2008). "Stellar contents
and star formation in the young open cluster Stock 8", Monthly Notices of
the Royal Astronomical Society, Vol. 384, 1675-1700. [2008MNRAS.384.1675J]
2. ^ Kang, Ji-hyun, Koo, Bon-Chul, & Salter, Chris (2012). "An Old Supernova
Remnant within an H II Complex at l ≈ 173°: FVW 172.8+1.5", The
Astronomical Journal, Vol. 143, 75. [2012AJ....143...75K]