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Alpha Game 169 Final Frontier   Fun and Games

Started 5/11/18 by Jenifer (Zarknorph); 4960583 views.

Trojan (is a small celestial body (mostly asteroids) that shares the orbit of a larger body, remaining in a stable orbit approximately 60° ahead of or behind the main body near one of its Lagrangian points L4 and L5. Trojans can share the orbits of planets or of large moons. Trojans are one type of co-orbital object. In this arrangement, a star and a planet orbit about their common barycenter, which is close to the center of the star because it is usually much more massive than the orbiting planet. In turn, a much smaller mass than both the star and the planet, located at one of the Lagrangian points of the star–planet system, is subject to a combined gravitational force that acts through this barycenter. Hence the smallest object orbits around the barycenter with the same orbital period as the planet, and the arrangement can remain stable over time. In the Solar System, most known trojans share the orbit of Jupiter. They are divided into the Greek camp at L4 (ahead of Jupiter) and the Trojan camp at L5 (trailing Jupiter). More than a million Jupiter trojans larger than one kilometer are thought to exist, of which more than 7,000 are currently catalogued. In other planetary orbits only nine Mars trojans, 28 Neptune trojans, two Uranus trojans, and two Earth trojans, have been found to date. A temporary Venus trojan is also known. Numerical orbital dynamics stability simulations indicate that Saturn and Uranus probably do not have any primordial trojans. The same arrangement can appear when the primary object is a planet and the secondary is one of its moons, whereby much smaller trojan moons can share its orbit. All known trojan moons are part of the Saturn system. Telesto and Calypso are trojans of Tethys, and Helene and Polydeuces of Dione)

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Green are the trojan asteroids of Jupiter...................

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New Trojan asteroid discovered sharing Earth's orbit, likely to hang around for at least 4000 years

Astronomers have discovered a new Trojan asteroid 2020 XL5 sharing Earth's orbit and has been estimated to hang around for at least 4000 years before zipping...

Calling it a night........................

PTG (anotherPTG)

From: PTG (anotherPTG)

Nov-27

Ursula (minor planet designation: 375 Ursula), provisional designation 1893 AL, is a dark asteroid and parent body of the Ursula family from the outer regions of the asteroid belt. It is one of the largest asteroids with a diameter of approximately 200 kilometers. It was discovered on 18 September 1893, by French astronomer Auguste Charlois at Nice Observatory in France.[16] The referent of the asteroids's name is unknown

375Ursula-LB1.jpg

375) Ursula / TYC 2892-01195-1 event on 2021 Dec 25, 13:32 UT

Virgo Cluster (is a large cluster of galaxies whose center is 53.8 ± 0.3 Mly (16.5 ± 0.1 Mpc) away in the constellation Virgo. Comprising approximately 1,300 (and possibly up to 2,000) member galaxies, the cluster forms the heart of the larger Virgo Supercluster, of which the Local Group (containing our Milky Way galaxy) is a member. The Local Group actually experiences the mass of the Virgo Supercluster as the Virgocentric flow. It is estimated that the Virgo Cluster's mass is 1.2×1015 M? out to 8 degrees of the cluster's center or a radius of about 2.2 Mpc. Many of the brighter galaxies in this cluster, including the giant elliptical galaxy Messier 87, were discovered in the late 1770s and early 1780s and subsequently included in Charles Messier's catalogue of non-cometary fuzzy objects. Described by Messier as nebulae without stars, their true nature was not recognized until the 1920s. The cluster subtends a maximum arc of approximately 8 degrees centered in the constellation Virgo. Although some of the cluster's most prominent members can be seen with smaller instruments, a 6-inch telescope will reveal about 160 of the cluster's galaxies on a clear night. Its brightest member is the elliptical galaxy Messier 49; however its most famous member is the elliptical galaxy Messier 87, which is located in the center of the cluster)

Virgo Supercluster

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Calling it a night............................

PTG (anotherPTG)

From: PTG (anotherPTG)

Nov-28

War and Peace Nebula or NGC 6357 is a diffuse nebula near NGC 6334 in the constellation Scorpius. The nebula contains many proto-stars shielded by dark discs of gas, and young stars wrapped in expanding "cocoons" or expanding gases surrounding these small stars. It is also known as the Lobster Nebula. This nebula was given the name  by the Midcourse Space Experiment scientists because of its appearance, which, in infrared imor ages the bright, western part resembles a dove, while the eastern part looks like a skull

NGC 6357 - Wikipedia

NGC 6357 War & Peace Nebula in HSO - Experienced Deep Sky Imaging - Cloudy  Nights

X-71 (was the classification of two space shuttles in the movie Armageddon that transported the astronauts from Earth to the asteroid. The two known X-71s are the Freedom and the Independence)

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Off to work....................................

PTG (anotherPTG)

From: PTG (anotherPTG)

Nov-28

Yukitsuna is a core member of the Maria family (506), a large intermediate belt family of stony asteroids. Alternatively, it has also been assigned to the stony Eunomia family (502), one of the most prominent families in the intermediate main belt with more than 5,000 members.

It orbits the Sun in the central main-belt at a distance of 2.2–2.9 AU once every 4 years and 1 month (1,489 days; semi-major axis of 2.55 AU). Its orbit has an eccentricity of 0.16 and an inclination of 16° with respect to the ecliptic.

The asteroid was first observed as 1943 UF at Heidelberg Observatory in October 1943. The body's observation arc begins as 1974 FQ1 at Crimea–Nauchnij in March 1974, more than 17 years prior to its official discovery observation at Yakiimo.

Dwarf planet - Wikipedia

Zone of Avoidance (is the area of the sky that is obscured by the Milky Way. The Zone of Avoidance was originally called the Zone of Few Nebulae in an 1878 paper by English astronomer Richard Proctor that referred to the distribution of "nebulae" in John Herschel's General Catalogue of Nebulae. When viewing space from Earth, the attenuation, interstellar dust and stars in the plane of the Milky Way (the galactic plane) obstruct the view of around 20% of the extragalactic sky at visible wavelengths. As a result, optical galaxy catalogues are usually incomplete close to the galactic plane. Many projects have attempted to bridge the gap in knowledge caused by the Zone of Avoidance. The dust and gas in the Milky Way cause extinction at optical wavelengths, and foreground stars can be confused with background galaxies. However, the effect of extinction drops at longer wavelengths, such as the infrared, and the Milky Way is effectively transparent at radio wavelengths. Surveys in the infrared, such as IRAS and 2MASS, have given a more complete picture of the extragalactic sky. Two very large nearby galaxies, Maffei 1 and Maffei 2, were discovered in the Zone of Avoidance by Paolo Maffei by their infrared emission in 1968. Even so, approximately 10% of the sky remains difficult to survey as extragalactic objects can be confused with stars in the Milky Way. Projects to survey the Zone of Avoidance at radio wavelengths, particularly using the 21 cm spin-flip emission line of neutral atomic hydrogen (known in astronomical parlance as HI), have detected many galaxies that could not be detected in the infrared. Examples of galaxies detected from their HI emission include Dwingeloo 1 and Dwingeloo 2, discovered in 1994 and 1996, respectively)

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Off to work...................................

PTG (anotherPTG)

From: PTG (anotherPTG)

Nov-29

The Ant Nebula, whose technical name is Mz3, resembles the head and thorax of an ant when observed with ground-based telescopes. The new Hubble image, with 10 times the resolution revealing 100 times more detail, shows the "ant's" body as a pair of fiery lobes protruding from a dying, Sun- like star. The Ant Nebula is located between 3,000 and 6,000 light years from Earth in the southern constellation Norma.

This image from NASA's Hubble Space Telescope image of a celestial object called the Ant Nebula may shed new light on the future demise of our Sun.

Round 6..........................

Boötes Void (is an approximately spherical region of space found in the vicinity of the constellation Boötes, containing very few galaxies, hence its name. It is enormous, with a radius of 62 megaparsecs. Its center is located at approximately right ascension 14h 50m and declination 46°. At nearly 330 million light-years in diameter (approximately 0.27% of the diameter of the observable Universe), or nearly 236,000 Mpc3 in volume, the Boötes Void is one of the largest known voids in the Universe, and is referred to as a supervoid. Its discovery was reported by Robert Kirshner et al. (1981) as part of a survey of galactic redshifts. The centre of the Boötes Void is approximately 700 million light-years from Earth. Other astronomers soon discovered that the void contains a few galaxies. In 1987, J. Moody, Robert P. Kirshner, G. MacAlpine, and S. Gregory published their findings of eight galaxies in the void. M. Strauss and John Huchra announced the discovery of three more galaxies in 1988, and Greg Aldering, G. Bothun, Robert P. Kirshner, and Ron Marzke announced the discovery of fifteen galaxies in 1989. By 1997, the Boötes Void was known to contain 60 galaxies in a space that would usually roughly have 2000. According to astronomer Greg Aldering, the scale of the void is such that "If the Milky Way had been in the center of the Boötes Void, we wouldn't have known there were other galaxies until the 1960s." The Hercules Supercluster forms part of the near edge of the void)

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Calling it a night.................................

PTG (anotherPTG)

From: PTG (anotherPTG)

Dec-1

Nicolaus Copernicus (19 February 1473 – 24 May 1543) was a Renaissance polymath, active as a mathematician, astronomer, and Catholic canon, who formulated a model of the universe that placed the Sun rather than Earth at its center. In all likelihood, Copernicus developed his model independently of Aristarchus of Samos, an ancient Greek astronomer who had formulated such a model some eighteen centuries earlier

Nikolaus Kopernikus.jpg

Nicolaus Copernicus - Quotes, Discoveries & Inventions - Biography

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