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Sept. 22/23/24, 2022 - Location: Davis Mountains west of Fort Davis, TX Telescope: 10 in. RC Mount: Paramount MX Camera: Apogee Alta F8300M Exposure: Ha = 18x30 min. Bin 1x1 R G & B = 15x15 min. each Bin 2x2 Click on the image below to view at higher resolution. |
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Sh2-176, as listed in the Sharpless Catalog, is located in the constellation Cassiopeia 140 parsecs(2) (457 light years) distance. Sabbadin et al 1977(2) determined Sh2-176 to be an ancient planetary nebula that is expanding at a rate of 19 kilometers per second(1). Sh2-176 is very faint and has expanded to a diameter of about 1.6 light years(3). Although the nebula is essentially round, it is asymmetrically brighter toward the southeast. This is probably due to a bow shock produced by interactions with surrounding interstellar medium(1). This bow shock displays as a bright crescent in the lower left section of the nebula. The central star is a dim blue subdwarf with a magnitude of 18.74(1).
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