Comet Wirtanen 46P on December 15, 2018 taken in the blue-sky moonlight, with the first quarter Moon still well up in the southwest, and when the comet was passing near the Pleiades star cluster, Messier 45, in Taurus. Some high cloud and haze was just beginning to move in, thwarting any further efforts to shoot the scene under darker skies later that night after moonset. The comet was nearest to Earth on this weekend, Dec 15-16, 2018. This is a stack of 2 x 90-second exposures aligned on the stars, and 2 x 30-second exposures aligned on the comet and blended in for the core of the comet coma to reduce its intensity and size. All with the 200mm Canon L lens at f/2.8 and Canon 6D MkII at ISO 800. Lens focused with the Bhatinov mask. Diffraction spikes added with Astronomy Tools action, for photogenic effect. They look pretty!
The stars Cor Caroli (bottom left) and Chara (top right) in Canes Venatici, with the bright galaxy Messier 94 at top left. Cor Caroli is a bright double star but is not resolved here. This is a stack of 6 x 6-minute exposures at ISO 800 with the William Optics RedCat 51mm astrograph at f/4.9 and Canon EOS Ra at ISO 800, from home May 23. The field is 8° x 5° so similar to binoculars. North is up.
This is the central area of Cygnus and its bright Milky Way starcloud surrounded by red nebulosity. At left is the star Sadr (gamma Cygni) with the complex of nebulosity catalogued as IC 1318. At centre is the distinct Crescent Nebula, NGC 6888, a expanding nebula created by winds from a hot Wolf-Rayet star. At bottom left is the star cluster Messier 29, though looking a little lost in the rich starfields here. At top is the cluster IC 1311, looking more obvious than M29 but not observed visually and included in the NGC catalog. Odd. At far right are the large and loose star clusters NGC 6883 and NGC 6871, the latter an obvious binocular sight. To the left of Sadr is the small cluster NGC 6910. The dark nebulas B145 and LDN 862 are at right. The small emission nebula at bottom is Sharpless 2-104. This is a stack of 6 x 6-minute exposures at ISO 1600 without a filter, blended with 8 x 12-minute exposures at ISO 3200 taken through the Optolong L-Enhance dual narrowband filter to really bring out the faint nebulosity. All were with the William Optics RedCat 51mm f/5 astrograph and red-sensitive Canon EOS Ra full-frame mirrorless camera. Blending the two sets of exposures brings out the nebulosity while retaining the more natural colours in the stars and background sky. All stacked, aligned and blended in Photoshop CC. Taken from home in the wee hours of the morning of May 15/16, 2020 before dawn’s light began to wash out the sky.
