March 4, 2017
Rho Ophiuchi cloud and nebula complex. In the center is the giant star Antares. Below and to the right of Antares is the star cluster M4. Another smaller star cluster, M80, is at left center. Other nebulas and dust clouds in this region make it popular with astrophotographers. Canon 7D MII (H-alpha mod), Zeiss 135mm f2 Sonnar, ISO 1600, 58 sixty second exposures stacked in Images Plus, tracked with an AstroTrac.