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SH2-73 (Hercules) * April-May 2017 * ASA N12 astrograph (f/3.6, 1081mm ) * DDM85 mount * G3 16200 Moravian CCD * LRGB Baader filters * L:520 minutes R:230 min G:190min B:230min * SH2-73 is a reflective nebula in the Hercules constellation. Originally exchanged for a HII region, it was discovered that it is illuminated by our galaxy as a whole, and is part of the so-called "Integrated Flux Nebulae" (IFNs). It is observed in the southwestern part of the constellation, at the border with the Head of the Snake and the Boreal Wreath; It appears as a very weak filament just perceptible in astronomical photos sensitive a Sh2-73 is one of the clouds closest to the solar system, being just 200 parsec away (about 650 light years); It is at a very high galactic latitude and does not appear associated with any luminous star, nor does it have stellar formation phenomena. The cloud could be associated with MBM 40, a weak unlined gas filament containing 20-40 M⊙ and about 120 parsec away from the Sun. Information credits :Wkipedia & Sharpless catalog | ![]() |
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