Question: WASP-17b is located in a constellation identified by which astronomer?
Context: Pyxis ( ; Latin for a small medicinal box) is a small and faint constellation in the southern sky.  Abbreviated from Pyxis Nautica, its name is Latin for a mariner's compass (contrasting with Circinus, which represents a draftsman's compasses).  Pyxis was introduced by Nicolas Louis de Lacaille in the 18th century, and is counted among the 88 modern constellations.  The constellation is located close to those forming the old constellation of the ship Argo Navis, and in the 19th century astronomer John Herschel suggested renaming Pyxis to Malus, the mast, but the suggestion was not followed.  Pyxis is completely visible from latitudes south of 53 degrees north, with its best evening-sky visibility in February and March. Scorpius is one of the constellations of the zodiac.  Its name is Latin for scorpion, and its symbol is (Unicode ♏).  Scorpius is one of the 48 constellations identified by the Greek astronomer Ptolemy in the second century.  It is an ancient constellation that pre-dated the Greeks.  It lies between Libra to the west and Sagittarius to the east.  It is a large constellation located in the southern hemisphere near the center of the Milky Way. WASP-17b is an exoplanet in the constellation Scorpius that is orbiting the star WASP-17.  Its discovery was announced on 11 August 2009.  It is the first planet discovered to have a retrograde orbit, meaning it orbits in a direction counter to the rotation of its host star.  This discovery challenged traditional planetary formation theory.  In terms of diameter, WASP-17b is the second-largest exoplanet discovered yet, and at half Jupiter's mass, this makes it the most puffy planet known.  On 3 December 2013, scientists working with the Hubble Space Telescope reported detecting water in the atmosphere of the exoplanet. Messier 72 (also known as M72 or NGC 6981) is a globular cluster in the Aquarius constellation discovered by French astronomer Pierre Méchain on August 29, 1780.  French astronomer Charles Messier looked for it on the following October 4, and included it in his catalog.  Both decided that it was a faint nebula rather than a cluster.  With a larger instrument, British astronomer John Herschel called it a bright "cluster of stars of a round figure".  American astronomer Harlow Shapley noted a similarity to Messier 4 and Messier 12. Coordinates: -14+-07/60+-15/3600&zoom=ln100000/ln10+1 round 0&show_grid=1&show_constellation_lines=1&show_constellation_boundaries=1&show_const_names=1&show_galaxies=1&img_source=IMG_all 22 32 23, −14° 07′ 15″ NGC 7302 is a Lenticular galaxy located around 124 million Light-years away from Earth in the constellation of Aquarius.  NGC 7302 was discovered by British astronomer William Herschel on October 3, 1785 and was rediscovered by American astronomer Lewis Swift on August 8, 1896 and was listed in the IC catalogue as IC 5228.  It is also part of a group of interatcing galaxies. Alpha Telescopii, Latinized from α Telescopii, is the brightest star in the northern constellation of Telescopium, with an apparent visual magnitude of 3.5.  The ancient Roman astronomer Ptolemy included it in the constellation Corona Australis, but it was moved to Telescopium when that constellation was created by French astronomer Nicolas Louis de Lacaille in the 18th century.  Parallax measurements put it at a distance of 278 ly from Earth.  At that range, the visual magnitude of the star is diminished by an extinction of 0.22 due to interstellar dust. Turdus Solitarius (Latin for "solitary thrush") was a constellation created by French astronomer Pierre Charles Lemonnier in 1776 from stars of Hydra's tail.  It was named after the Rodrigues solitaire, an extinct flightless bird that was endemic to the island of Rodrigues East of Madagascar in the Indian Ocean.  It was replaced by another constellation, Noctua (the Owl), in "A Celestial Atlas" (1822) by the British amateur astronomer Alexander Jamieson.  Neither constellation is in current use. TrES-4b is an extrasolar planet, and one of the largest exoplanets ever found, after WASP-12b, WASP-17b, CT Chamaeleontis b (though the latter may be a brown dwarf) and HD 100546 b.  It was discovered in 2006, and announced in 2007, by the Trans-Atlantic Exoplanet Survey, using the transit method.  It is 1430 ly away at star GSC 02620-00648, in the constellation Hercules. Sagitta is a dim but distinctive constellation in the northern sky.  Its name is Latin for "arrow", and it should not be confused with the signifigantly larger constellation Sagittarius, the archer.  Although Sagitta is an ancient constellation, it has no star brighter than 3rd magnitude and has the third-smallest area of all constellations (only Equuleus and Crux are smaller).  It was included among the 48 constellations listed by the 2nd century astronomer Ptolemy, and it remains one of the 88 modern constellations defined by the International Astronomical Union.  Located to the north of the equator, Sagitta can be seen from every location on Earth except within the Antarctic circle. NGC 1614 is the "New General Catalogue" identifier for a spiral galaxy in the equatorial constellation of Eridanus.  It was discovered on December 29, 1885 by American astronomer Lewis Swift, who described it in a shorthand notation as: pretty faint, small, round, a little brighter middle.  The nebula was then catalogued by Danish-Irish astronomer J. L. E. Drayer in 1888.  When direct photography became available, it was noted that this galaxy displayed some conspicuous peculiarities.  American astronomer Halton Arp included it in his 1966 "Atlas of Peculiar Galaxies".  In 1971, Swiss astronomer Fritz Zwicky described it as a "blue post-eruptive galaxy, compact patchy core, spiral plumes, long blue jet SSW".
Answer: identified by the Greek astronomer Ptolemy