Abstract
A 15 × 70 is the ideal binocular, for this is a large, very faint (it has an integrated magnitude of 6.0, but this is spread over more than a square degree) nebula, which requires excellent conditions to become visible—under these conditions, some observers are able to see it with the unaided eye. With a dark, transparent sky and averted vision, this accumulation of gas, which is energized by ultraviolet radiation from the runaway star, ξ Per, becomes faintly and eerily apparent, usually starting at the SE region, then gradually extending northwards as you are able to see more of it.
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Moore 1986, p. 96
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Tonkin, S. (2014). December Solstice to March Equinox (RA 04:00 h to 10:00 h). In: Binocular Astronomy. The Patrick Moore Practical Astronomy Series. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-7467-8_11
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DOI: https://doi.org/10.1007/978-1-4614-7467-8_11
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