Emission Nebula Sh2-155 - Cave Nebula - AR 22h 57m 17s DEC +62° 28' 33"
Date/Place2018-08-16 at Elijah Observatory
ScopeTakahashi FSQ85ED
IntegrationImage aquisition with Astroscheduler 1.0
LRGB Composition:
L: 42 x 600 sec., bin 1
RGB: 18x600 sec. per channel, bin 1
CCD Temperature: -20 °C
CommentDiffuse nebula in the constellation Cepheus, within a larger nebula complex containing emission, reflection, and dark nebulosity. Sh2-155 is an ionized H II region with ongoing star formation activity, at an estimated distance of 2400 ly from Earth.
Sh2-155 lies at the edge of the Cepheus B cloud (part of the Cepheus molecular cloud), and is ionized by young stars from the Cep OB3 association. It has been suggested that radiation from the hot O-type star HD 217086 is compressing the region, triggering the formation of a new generation of stars.(Text adapted from Wikipedia) On the crops it is possible to see the dark nebula DOBASHI 3442 (top) and some Infrared and Young Stellar Objects (bottom).