From GalaxyMap:

Avedisova combines Sh 2-299 and Sh 2-300 into the star formation region SFR 230.98+1.49 and says that they are ionised by three B0-class stars: LSS 465 (MFJ SH 2-299 1), LSS 478 (MFJ SH 2-300 1) and the supergiant LSS 480 (MFJ SH 2-300 6).

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.

S299, S300, S305, S306, S307 and S309 are all part of the same giant molecular cloud complex at 4200 pc. [1]

More on the GS234-02 supershell. [2]

Notes

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. 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]

GENERAL NOTE ON SHARPLESS2 OBJECTS>>>>>>>>>>>>>

I have been on a project for several years now to image all the Sharpless2 Objects that I can see from my location near San Francisco. I chose these because they are visible in light polluted areas. These objects generally represent left over Hydrogen along the edge of the Milky Way that has gotten molded into interesting shapes.

There are 312 Sh2 objects and those below 70 and above 283 are low on the horizon and difficult for me to image... this leaves me 212 that are feasible... and I have imaged all of these but the 13 of these are too big for my system. .

This image was the last image taken in the series and I may add some more if I can get closer to the horizon... the first one was taken on December 23, 2013.

Many were taken with my old Tak 180 ED, which had a wide field of view, but was replaced with my Stellarvue 130, which is more narrow field.

I am steadily reprocessing the older data with more modern techniques.

This is my collection:

Sharpless2

Please note there is also a Sharpless2 Group with now more than 1000 examples.

Hope you enjoy these obscure but interesting objects...