Finder Chart for Jim's Pick of the Month April 2021 Messier 3

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Finder Chart for Jim’s Pick of the Month April 2021 Messier 3 FACTS Object: Cluster Type: Globular Class: VI Designations: Messier 3, M3, NGC 5272, GCl 25, C 1339+286 Constellation: Canes Venatici Right Ascension: 13h 42m 11.62s Declination: +28°22’38.2” Distance: 33,900 light years (10.4 kiloparsecs) Age: 11.39 billion years Number of stars: 500,000 Apparent magnitude: +6.2 Absolute magnitude: -8.93 Messier 3. Image: Wikisky Messier 3 (M3) is a globular cluster located in the constellation Canes Venatici, the Hunting Dogs. It is one of the brightest, largest globular clusters in the sky. M3 has an apparent magnitude of 6.2 and is approximately 33,900 light years distant from Earth. It has the designation NGC 5272 in the New General Catalogue. With a visual magnitude of 6.2, Messier 3 is difficult (but not impossible) to see without binoculars even in good viewing conditions, but the cluster appears fully defined in a moderate-sized telescope. A 4-inch telescope will reveal the bright core without resolving individual stars. A 6-inch instrument will resolve some of the outer stars, while an 8-inch telescope will reveal the stars everywhere in the cluster except in the bright core region. The central region of M3 can only be resolved into stars by larger instruments, starting with telescopes with a 12-inch aperture. Messier 3 can be found halfway from the bright star Arcturus in Boötes constellation to Cor Caroli in Canes Venatici. It lies about 6 degrees north-northeast of Beta Comae Berenices, near the border between the constellations Canes Venatici and Boötes. The best time of year to observe the cluster from northern latitudes is during the months of March, April and May. .

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Messier Objects
Messier Objects From the Stocker Astroscience Center at Florida International University Miami Florida The Messier Project Main contributors: • Daniel Puentes • Steven Revesz • Bobby Martinez Charles Messier • Gabriel Salazar • Riya Gandhi • Dr. James Webb – Director, Stocker Astroscience center • All images reduced and combined using MIRA image processing software. (Mirametrics) What are Messier Objects? • Messier objects are a list of astronomical sources compiled by Charles Messier, an 18th and early 19th century astronomer. He created a list of distracting objects to avoid while comet hunting. This list now contains over 110 objects, many of which are the most famous astronomical bodies known. The list contains planetary nebula, star clusters, and other galaxies. - Bobby Martinez The Telescope The telescope used to take these images is an Astronomical Consultants and Equipment (ACE) 24- inch (0.61-meter) Ritchey-Chretien reflecting telescope. It has a focal ratio of F6.2 and is supported on a structure independent of the building that houses it. It is equipped with a Finger Lakes 1kx1k CCD camera cooled to -30o C at the Cassegrain focus. It is equipped with dual filter wheels, the first containing UBVRI scientific filters and the second RGBL color filters. Messier 1 Found 6,500 light years away in the constellation of Taurus, the Crab Nebula (known as M1) is a supernova remnant. The original supernova that formed the crab nebula was observed by Chinese, Japanese and Arab astronomers in 1054 AD as an incredibly bright “Guest star” which was visible for over twenty-two months. The supernova that produced the Crab Nebula is thought to have been an evolved star roughly ten times more massive than the Sun.
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Astronomy & Astrophysics manuscript no. sbg˙comsge˙ed c ESO 2018 October 16, 2018 Optical counterparts of ROSAT X-ray sources in two selected fields at low vs. high Galactic latitudes J. Greiner1, G.A. Richter2 1 Max-Planck-Institut für extraterrestrische Physik, 85740 Garching, Germany 2 Sternwarte Sonneberg, 96515 Sonneberg, Germany Received 14 October 2013 / Accepted 12 August 2014 ABSTRACT Context. The optical identification of large number of X-ray sources such as those from the ROSAT All-Sky Survey is challenging with conventional spectroscopic follow-up observations. Aims. We investigate two ROSAT All-Sky Survey fields of size 10◦× 10◦ each, one at galactic latitude b = 83◦ (26 Com), the other at b = –5◦ (γ Sge), in order to optically identify the majority of sources. Methods. We used optical variability, among other more standard methods, as a means of identifying a large number of ROSAT All- Sky Survey sources. All objects fainter than about 12 mag and brighter than about 17 mag, in or near the error circle of the ROSAT positions, were tested for optical variability on hundreds of archival plates of the Sonneberg field patrol. Results. The present paper contains probable optical identifications of altogether 256 of the 370 ROSAT sources analysed. In partic- ular, we found 126 AGN (some of them may be misclassified CVs), 17 likely clusters of galaxies, 16 eruptive double stars (mostly CVs), 43 chromospherically active stars, 65 stars brighter than about 13 mag, 7 UV Cet stars, 3 semiregular resp. slow irregular variable stars of late spectral type, 2 DA white dwarfs, 1 Am star, 1 supernova remnant and 1 planetary nebula.
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I SAAC N EWTON G ROUP OF T ELESCOPES Biennial Report 2006 2007 Published in Spain by the Isaac Newton Group of Telescopes (ING) ISSN 1575–8966 Legal license: TF–1142 /99 Apartado de correos, 321 E-38700 Santa Cruz de La Palma; Canary Islands; Spain Tel: +34 922 425 400 Fax: +34 922 425 401 URL: http://www.ing.iac.es/ Editor and designer: Javier Méndez ([email protected]) Printing: Gráficas Sabater. Tel: +34 922 623 555 Front cover: The Milky Way from the site of the William Herschel Telescope. Credit: Nik Szymanek. Inset: Photograph of the WHT at sunset. Credit: Nik Szymanek. Other picture credits: Nik Szymanek (WHT, p. 4; INT, p. 4; JKT, p. 4; ING, p. 5); Jens Moser (WHT, back; INT, back); Nik Szymanek (JKT, back). The ING Biennial Report is available online at http://www.ing.iac.es/PR/AR/. ISAAC NEWTON GROUP OF TELESCOPES Biennial Report of the STFC-NWO-IAC ING Board 2006 – 2007 ISAAC NEWTON GROUP William Herschel Telescope Isaac Newton Telescope Jacobus Kapteyn Telescope 4 • ING BIENNIAL R EPORT 2006–2007 OF TELESCOPES The Isaac Newton Group of Telescopes (ING) consists of the 4.2- metre William Herschel Telescope (WHT), the 2.5-metre Isaac Newton Telescope (INT) and the 1.0-metre Jacobus Kapteyn Telescope (JKT). The ING is located 2350 metres above sea level at the Observatorio del Roque de los Muchachos (ORM) on the island of La Palma, Canary Islands, Spain. The WHT is the largest telescope of its kind in Western Europe. The construction, operation, and development of the ING telescopes are the result of a collaboration between the United Kingdom, The Netherlands and Spain.
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