GALLERY COMETARY VISITOR Gerald Rhemann Comet 21P/GiacobiniZinner sports a long tail as it passes several emission nebulae in Auriga, including Sh2-235, Sh2-232, and Sh2-231, seen left to right, respectively. South is up in this photo. DETAILS: ASA 12-inch f/3.8 Newtonian astrograph with an FLI ML 16200 CCD camera. Total exposure: 58 minutes through LRGB filters. 74 JA N UA RY 2 019 * SK Y & TELESCOPE