Forensic Observing NOT ONE OF OUR OWN Charles Messier discovered M54 in 1778, but it wasn't until 1994 that astronomers realized that the globular cluster didn't originate in the Milky Way but was in fact formerly a member of another galaxy. At 85,000 to 90,000 light-years distant, M54 is more than three times farther away than our Sun is from the center of the Milky Way. BY THE HANDLE Begin your perusal of targets in the Sagittarius Stream below the familiar figure of the Teapot. σ SAGITTARIUS 2 3 4 5 6 7 8 τ Arp 2 M55 Wray 16-423 HD 181109 Terzan 8 Hen 2-436 HD 183997 HD 180420 Terzan 7 6723 γ 19h 30m α Arp 2 HD 183925 67 M55 HD 183799 67 HD 183216 71 Wray 16-423 HD 181109 HD 182681 56 19h 00m CRA CORE GROUP Use this image as a guide to the general location of the clutch of objects associated with the Sagittarius Dwarf Spheroidal Galaxy's remnant core. Detailed finders are at https://is.gd/SgrFinders. -35° M70 M69 ζ M54 -30° φ HD 183997 69 HD 180420 83 Terzan 8 Hen 2-436 HD 180336 85 Terzan 7 28 OCTOBER 2021 * SKY & TELESCOPE Star magnitudes M54: ESA / HUBBLE / NASA; WIDE-FIELD FINDER: POSS-II / STSCI / CALTECH / PALOMAR OBSERVATORYhttps://www.is.gd/SgrFinders