Catching the Serpent by the tail Michael L Allen
[email protected] Palouse Divide Lodge Star Party 2018 Michael L Allen Serpens Cauda PDLSP '18 1 / 22 Outline 1 Serpens Cauda in the sky 2 Mythological Serpens 3 Stars in the tail of Serpens 4 Star clusters 5 A colorful (!) planetary nebula Michael L Allen Serpens Cauda PDLSP '18 2 / 22 Serpens in the sky (from constellation-guide.com) Michael L Allen Serpens Cauda PDLSP '18 3 / 22 Albrecht D¨urer(1515); first printed star chart Michael L Allen Serpens Cauda PDLSP '18 4 / 22 Johann Bayer (1603); first atlas-style charts Michael L Allen Serpens Cauda PDLSP '18 5 / 22 Johannes Hevelius (1690) Michael L Allen Serpens Cauda PDLSP '18 6 / 22 John Flamsteed (1776) Michael L Allen Serpens Cauda PDLSP '18 7 / 22 Alexander Jamieson (1821) Michael L Allen Serpens Cauda PDLSP '18 8 / 22 Urania's Mirror (1825) Michael L Allen Serpens Cauda PDLSP '18 9 / 22 History of Serpens An old constellation; one of Ptolemy's 48 (ca. 150 CE) Serpens is intertwined with Ophiuchus, the Serpent-tamer Few historical astro-cartographers, like Bayer, showed Serpens as separate from Ophuichus Most considered Serpens and Ophuichus as one constellation The “official” constellation boundaries were set in the 1920s by Eug`eneDelporte; he divided Serpens into two parts, Serpens Caput (head) and Serpens Cauda (tail) Head and tail are separated by Ophiuchus Ranks 23rd by size of the 88 constellations Michael L Allen Serpens Cauda PDLSP '18 10 / 22 Mythological Serpens In the Greek & Roman tradition, the serpent is the symbol