By Scott Kranz
Sharpless 2-240 (Simeis 147) 05 40 33.9 +27 57 04 (J2000.0)
Location: ASKC DSS
Time: 01:42 CDT
Seeing: above average transparency, SQM 21.34
Instrument: 20-inch f/4.3 dob
Eyepiece(s): 17 Nagler = 148x = 33’, 12 Nagler = 209x = 23’
Sharpless 2-240 is a supernova remnant that is roughly 3,000 light-years away and 40,000 years old. It is 3.5° by 3.2° in size. While this supernova remnant was climbing much higher in the sky now, I spent nearly two hours picking out the brighter areas. I’ve searched and logged three of the brighter areas once before, but with the night being as good as it was, I went through and tried to tease more out of the huge object. Most times the filaments were visible without a filter. An Ultra-high contrast filter helped to isolate them more, but it didn’t really help to show more detail. All were seen with averted vision only at some level and usually seen best as the area moved into the Field of View and then lost for a bit once I stopped moving the scope. I started on the west side, star-hopping from beta Taurus, El Nath and worked my way around counterclockwise.