Avedisova lists the ionising stars as the O9 V BD -18 1920
and the B3 III giant LSS 566
. Other sources also include the B0V star MFJ Sh 2-307 3
. The nebula contains the infrared cluster candidate [DBS2003] 8
A 1995 paper places Sh 2-299, Sh 2-300, Sh 2-305, Sh 2-306, Sh 2-307 and Sh 2-309 into the same giant molecular cloud complex. A 1996 paper places Sh 2-305 to Sh 2-309 into molecular cloud [JKK96] D
within the enormous infrared ring called the GS234-02 supershell
, in the Perseus arm.
You can view the enormous dust ring around the supershell in this WISE infrared image
. Sh 2-299 and Sh 2-300 also appear in this direction.
Both Avedisova and a 2007 paper, however, give much closer distance estimates and thus appear to exclude this nebula from the supershell.
You can view a good Dean Salman image of this nebula here
The exciting star for this nebula is the B0V star MFJ Sh 2-307 3. It is part of the same giant molecular cloud complex that includes S299, S300, S305, S306 and S309 at 4200 pc.[1
Contains infrared cluster candidate [DBS2003] 8. [2
More on the GS234-02 supershell. [3
1. ^ Russeil, D., Georgelin, Y. M., Georgelin, Y. P., et al. (1995). "Galactic
HII regions at l= 234deg.", Astronomy and Astrophysics Supplement Series,
Vol. 114, 557. [1995A&AS..114..557R]
2. ^ Dutra, C. M., Bica, E., Soares, J., et al. (2003). "New infrared star
clusters in the southern Milky Way with 2MASS", Astronomy and Astrophysics,
Vol. 400, 533-539. [2003A&A...400..533D]
3. ^ Jung, Jae Hoon, Koo, Bon-Chul, & Kang, Yong-Hee (1996). "GS234-02: A Star
Forming Supershell in the Outer Galaxy", The Astronomical Journal, Vol.
112, 1625. [1996AJ....112.1625J]