Star Map 01 January 2021

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Night sky map January 2021 STAR BRIGHTNESS Zero or brighter st 1 magnitude nd 2 Andromeda Galaxy 3rd 4th Hyades M1Hyades - Crab Nebula M45 - Pleiades Mars P First Quarter Moon on the 21st Orion’s belt M42 - Orion Nebula The “Saucepan” M2 Fomalhaut Mercury P Jupiter P Saturn P Tarantula Nebula 47 Tucanae False Cross Carina Nebula Southern Cross Chart Key Diamond Cross Bright star Pointers Faint star Ecliptic MOON PHASE Milky Way Last quarter 06th P Planet New Moon 13th LMC or Large Magellanic Cloud First quarter 21st SMC or Small Magellanic Cloud Full Moon 29th THE CHART HIGHLIGHTS IN JANUARY 2021 This star chart shows the stars and constellations visible in the The best time to view the Moon with a small night sky for Sydney, Melbourne, Canberra and Hobart in telescope or pair of binoculars is a few days either January at about 8:30pm (Daylight Savings Time), or 7:30pm side of its first quarter phase on the 21st of January. (Local Standard Time) for Perth and Brisbane. For Darwin and Mars is high in the northern sky after sunset in the similar northerly locations, the chart will still apply, but some constellation of Aries (the Ram). Prominent in the stars will be lost off the southern edge while extra stars will be sky this month, are the constellations of Canis visible to the north. Stars down to a brightness or magnitude Major (the Great Dog) which includes Sirius – the limit of 4.5 are shown on the star chart. To use this star chart, brightest star in the sky and Orion (the Hunter), rotate the chart so that the direction you are facing (north, which includes the recognisable southern south, east or west) is shown at the bottom. The centre of the hemisphere asterism of the “Saucepan”. Crux (the chart represents the point directly above your head, called the Southern Cross) is low in the south-eastern sky and zenith point, and the outer circular edge represents the can be located by looking for the two adjacent horizon. Pointer stars in the constellation of Centaurus (the Centaur). Sydney Observatory is part of the Museum of Applied Arts and Sciences. The Sydney Observatory night sky map was created by Dr M. Anderson using the TheSky software. This month’s edition was prepared by Melissa Hulbert. © 2020 Museum of Applied Arts and Sciences, Sydney. .

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Winter Constellations
Winter Constellations *Orion *Canis Major *Monoceros *Canis Minor *Gemini *Auriga *Taurus *Eradinus *Lepus *Monoceros *Cancer *Lynx *Ursa Major *Ursa Minor *Draco *Camelopardalis *Cassiopeia *Cepheus *Andromeda *Perseus *Lacerta *Pegasus *Triangulum *Aries *Pisces *Cetus *Leo (rising) *Hydra (rising) *Canes Venatici (rising) Orion--Myth: Orion, the great hunter. In one myth, Orion boasted he would kill all the wild animals on the earth. But, the earth goddess Gaia, who was the protector of all animals, produced a gigantic scorpion, whose body was so heavily encased that Orion was unable to pierce through the armour, and was himself stung to death. His companion Artemis was greatly saddened and arranged for Orion to be immortalised among the stars. Scorpius, the scorpion, was placed on the opposite side of the sky so that Orion would never be hurt by it again. To this day, Orion is never seen in the sky at the same time as Scorpius. DSO’s ● ***M42 “Orion Nebula” (Neb) with Trapezium A stellar nursery where new stars are being born, perhaps a thousand stars. These are immense clouds of interstellar gas and dust collapse inward to form stars, mainly of ionized hydrogen which gives off the red glow so dominant, and also ionized greenish oxygen gas. The youngest stars may be less than 300,000 years old, even as young as 10,000 years old (compared to the Sun, 4.6 billion years old). 1300 ly. 1 ● *M43--(Neb) “De Marin’s Nebula” The star-forming “comma-shaped” region connected to the Orion Nebula. ● *M78--(Neb) Hard to see. A star-forming region connected to the Orion Nebula.
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Celebrating the Wonder of the Night Sky
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Caldwell Catalogue - Wikipedia, the Free Encyclopedia
Caldwell catalogue - Wikipedia, the free encyclopedia Log in / create account Article Discussion Read Edit View history Caldwell catalogue From Wikipedia, the free encyclopedia Main page Contents The Caldwell Catalogue is an astronomical catalog of 109 bright star clusters, nebulae, and galaxies for observation by amateur astronomers. The list was compiled Featured content by Sir Patrick Caldwell-Moore, better known as Patrick Moore, as a complement to the Messier Catalogue. Current events The Messier Catalogue is used frequently by amateur astronomers as a list of interesting deep-sky objects for observations, but Moore noted that the list did not include Random article many of the sky's brightest deep-sky objects, including the Hyades, the Double Cluster (NGC 869 and NGC 884), and NGC 253. Moreover, Moore observed that the Donate to Wikipedia Messier Catalogue, which was compiled based on observations in the Northern Hemisphere, excluded bright deep-sky objects visible in the Southern Hemisphere such [1][2] Interaction as Omega Centauri, Centaurus A, the Jewel Box, and 47 Tucanae. He quickly compiled a list of 109 objects (to match the number of objects in the Messier [3] Help Catalogue) and published it in Sky & Telescope in December 1995. About Wikipedia Since its publication, the catalogue has grown in popularity and usage within the amateur astronomical community. Small compilation errors in the original 1995 version Community portal of the list have since been corrected. Unusually, Moore used one of his surnames to name the list, and the catalogue adopts "C" numbers to rename objects with more Recent changes common designations.[4] Contact Wikipedia As stated above, the list was compiled from objects already identified by professional astronomers and commonly observed by amateur astronomers.
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Arxiv:1807.10772V1 [Astro-Ph.SR] 27 Jul 2018
Draft version July 31, 2018 A Preprint typeset using LTEX style emulateapj v. 12/16/11 IMPROVED MAIN SEQUENCE TURNOFF AGES OF YOUNG OPEN CLUSTERS: MULTICOLOR UBV TECHNIQUES & THE CHALLENGES OF ROTATION Jeffrey D. Cummings1 & Jason S. Kalirai2,1 Draft version July 31, 2018 ABSTRACT Main sequence turnoff ages in young open clusters are complicated by turnoffs that are sparse, have high binarity fractions, can be affected by differential reddening, and typically include a number of peculiar stars. Furthermore, stellar rotation can have a significant effect on a star’s photometry and evolutionary timescale. In this paper we analyze in 12 nearby open clusters, ranging from ages of 50 Myr to 350 Myr, how broadband UBV color-color relations can be used to identify turnoff stars that are Be stars, blue stragglers, certain types of binaries, or those affected by differential reddening. This UBV color-color analysis also directly measures a cluster’s E(B–V) and estimates its [Fe/H]. The turnoff stars unaffected by these peculiarities create a narrower and more clearly defined cluster turnoff. Using four common isochronal models, two of which consider rotation, we fit cluster parameters using these selected turnoff stars and the main sequence. Comparisons of the photometrically fit cluster distances to those based on Gaia DR2 parallaxes find that they are consistent for all clusters. For older (>100 Myr) clusters, like the Pleiades and the Hyades, comparisons to ages based on the lithium depletion boundary method finds that these cleaned turnoff ages agree to within ∼10% for all four isochronal models. For younger clusters, however, only the Geneva models that consider rotation fit turnoff ages consistent with lithium-based ages, while the ages based on non-rotating isochrones quickly diverge to become 30% to 80% younger.
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