and IC4605, the "Rho Bros"
IC4603 and IC4605 are reflection nebula that are part of the Rho
Ophiuchi cloud complex that stretches over 5 degrees. IC4604
the larger blue area at the top-left, IC4603 is the smaller blue nebula
just to its right, and IC4605 is at the bottom-right. The
dark cloud is part of Barnard 44 which extends well beyond the
image. This complex is one of the closest star-forming clouds
Earth, at "only" 460 light-years away. North is at the left.
StellarVue SV70T Refractor with SFFR-70APO
Focal-reducer/Field-flattener, Celestron CI-700 Mount
ZWO ASI1600MMC monochrome with ZWO LRGB filters
QHY5L-IIM through Orion Thin OAG, PHD guiding software
L:(71) 120 secs @ gain=139, RGB: each
channel (10) 120 sec @ gain=200
06-17-2023, Tierra del Sol, CA, good conditions, some dew.