June 2021 Observing Challenge…Have Fun… Pat Utah
Easy: M5, M27, M64
M5: Discovered by Gottfried Kirch and his wife Maria Margarethe in 1702. Charles Messier found it independently in 1764. William Herschel resolved individual stars in the cluster in 1791; he counted 200 of them with his “Forty-Foot" reflector. The Great Forty-Foot telescope completed construction in1789. It used a 48-inch diameter primary mirror with a 40-foot-long focal length (hence its name "Forty-Foot"). It was the largest telescope in the world for 50 years.
M27: The Dumbbell Nebula is a planetary nebula, at a distance of about 1360 light-years It was the First such nebula to be discovered, by Charles Messier in 1764. It has a visual magnitude of 7.5 and a diameter of about 8 arcminutes.
M27 Redux: For the newer EAA Folks, a recorded Live View of M27 at 3 frames per second using a C11 with a Hyperstar and a 1/2 CCD (640 x 480) Mallin Cam at near Max gain. This is an example of one of the stepping stones in the evolution of EAA as we know it today.
M64: The Black Eye Galaxy was discovered by Edward Pigott in March 1779. A dark band of absorbing dust partially in front of its bright nucleus gave rise to its nickname of the "Black Eye” Galaxy.
Medium: M16 Eagle, M17 Swan and a Close up Challenge: The Pillars of Creation
M16: The Eagle Nebula (catalogued as Messier 16) was discovered by Jean-Philippe de Cheseaux in 1745–46. The nebula contains several active star-forming gas and dust regions, including the Pillars of Creation. The Eagle Nebula lies in the Sagittarius Arm of the Milky Way.
Pillars of Creation: The "Pillars of Creation", depicts a large region of star formation. Its small dark pockets are believed to be protostars (Bok globules).
M17: The Swan Nebula was discovered by Philippe Loys de Chéseaux in 1745. The Swan Nebula is between 5,000 and 6,000 light-years from Earth and it spans some 15 light-years in diameter. It is considered one of the brightest and most massive star-forming regions of our galaxy.
Difficult: IC 1470, NGC 6543, M1-92
IC 1470: Pearl on Tongue Nebula, also designated as Sh2-156, is a small emission nebula in constellation Cepheus, at a distance of about 16,000 light-years.
NGC 6543: The Cats Eye Planetary Nebula found in Draco and discovered by William Herschel on February 15, 1786. It has a bright, bluish disk and a faint central star.
M1-92: Minkowski 92, the Foot Print Nebula, is a 11th magnitude Bright Nebula appearing in the constellation Cygnus. Two onion-shaped structures either side of an aging star, giving it a very distinctive shape. It will be very difficult to image at Mag 11.
Edited by Alien Observatory, 31 May 2021 - 09:13 PM.