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Messier 19 or M19 (also designated NGC 6273) is a globular cluster in the constellation Ophiuchus. It was discovered by Charles Messier on June 5, 1764 [ 6 ] and added to his catalogue of comet -like objects that same year.
Bracelet and necklace wire components are generally made out of wire that is 16-, 18- or 20-gauge (1.3 to 0.8 mm). Earring wires are usually made out of 18- or 20-gauge wire (1.0 to 0.8 mm). When making wire wrapped jewelry, these components are connected to one another with wire that is generally 20- to 26-gauge (0.8 to 0.4 mm). Frequently the ...
Charles Messier. The first edition of 1774 covered 45 objects (M1 to M45).The total list published by Messier in 1781 contained 103 objects, but the list was expanded through successive additions by other astronomers, motivated by notes in Messier's and Méchain's texts indicating that at least one of them knew of the additional objects.
Typical material properties for 6060 aluminum alloy include: [2] Density: 2.710 g/cm 3, or 169 lb/ft 3. Young's modulus: 70 GPa, or 10 Msi, or 303 EMEC; Ultimate tensile strength: 140 to 230 MPa, or 20 to 33 ksi. Yield strength: 70 to 180 MPa, or 10 to 26 ksi. Thermal Expansion: 23.4 μm/m-K. Solidus: 610 °C or 1130 °F.
Messier 26, also known as NGC 6694, is an open cluster of stars in the southern constellation of Scutum. It was discovered by Charles Messier in 1764. [ a ] This 8th magnitude cluster is a challenge to find in ideal skies with typical binoculars , where it can be, with any modern minimum 3-inch (76 mm) aperture device.
HD 161056 (HIP 86768, HR 6601) is a bluish-white hued star in the equatorial constellation of Ophiuchus.It has an apparent magnitude of 6.32, placing it near the limit for naked eye visibility under dark skies.
The Little Dumbbell Nebula, also known as Messier 76, NGC 650/651, the Barbell Nebula, or the Cork Nebula, [1] is a planetary nebula in the northern constellation of Perseus. It was discovered by Pierre Méchain in 1780 and included in Charles Messier 's catalog of comet -like objects as number 76.
Messier 34 (also known as M34, NGC 1039, or the Spiral Cluster) is a large and relatively near open cluster in Perseus. It was probably discovered by Giovanni Batista Hodierna before 1654 [ 4 ] and included by Charles Messier in his catalog of comet -like objects in 1764.