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Mira A is a pulsating variable star and was the first non- supernova variable star discovered, with the possible exception of Algol. It is Apotek Majorna prototype of the Mira variables. Evidence that the variability of Mira was known in ancient ChinaBabylon or Greece is at best only circumstantial. Observing what he thought was the planet Mercury later identified as Jupiterhe needed a reference star for comparing positions and picked a previously unremarked third-magnitude star nearby.
By August 21, however, it had increased in Asian Miran by one magnitudethen by October had faded from view. Fabricius assumed it was a nova, but then saw it again on February 16, In Johannes Holwarda determined a period of the star's reappearances, eleven months; he is often credited with the discovery of Mira's variability. Johannes Hevelius was observing it at the same time and named it Mira infor it acted like no other known star. Ismail Bouillaud then estimated its period at days, less than one day off the modern value of days.
Bouillaud's measurement may not have been erroneous: Mira is known to vary slightly in period, and may even be slowly changing over time. The star is estimated to be a six-billion-year-old red giant. There is considerable speculation as to whether Mira had been observed prior to Fabricius. Certainly Algol 's history known for certain as a variable only inbut with legends and such dating back to antiquity showing that it had been observed with suspicion for millennia suggests that Mira might have been known too.
Karl Manitiusa modern translator of Hipparchus ' Commentary on Aratushas suggested that certain Xhmasters from Asian Miran second-century text may be about Mira. The other pre-telescopic Western catalogs of Ptolemyal-SufiUlugh Beg Undertale Sans Anime, and Tycho Brahe turn up no mentions, even as a regular star.
There are three observations from Chinese and Asian Miran archives, in, and the same year when Hipparchus would have made his observation BC that are suggestive. This binary star system consists of a red giant Mira, designated Mira A undergoing mass loss and a high temperature white dwarf companion Mira B that is accreting mass from the primary.
Such an arrangement of stars is known as a symbiotic system and this is the closest such symbiotic pair to the Sun. Examination of this system by the Chandra X-ray Observatory shows a direct mass exchange along a bridge of matter Asian Miran the primary to the white dwarf. The two stars are currently separated by about 70 astronomical units. With every pulse cycle Mira increases in luminosity and the pulses grow stronger.
This is also causing dynamic instability in Mira, resulting in dramatic changes in luminosity and size over shorter, irregular time periods. The overall Asian Miran of Mira A has been observed to change, exhibiting pronounced departures from symmetry. These appear to be caused by bright spots on the surface that evolve their shape on time scales of 3—14 months. Observations of Mira A in the ultraviolet band by the Hubble Space Telescope have shown a plume-like feature pointing toward the companion star.
Mira A is a variable starspecifically the prototypical Mira variable. In the particular case of Mira, Big Brother 2014 Sex increases in brightness take it up to about magnitude 3.
Individual cycles vary too; well-attested maxima go as high as magnitude 2. Minima range much less, and have historically been between 8. The total swing in brightness from absolute maximum to absolute minimum two events which did not occur on the same cycle is 1, times. Mira emits the vast majority of its radiation in the infraredand its variability in that Asian Miran is only about two magnitudes. The shape of its light curve is of an increase over about days, and the return to minimum taking twice as long.
Contemporary approximate maxima for Mira: . From northern temperate latitudes, Mira is generally not visible between late March and June due to its proximity to the Sun.
This means that at times several years can pass without it appearing Amsterdam Outcall a naked-eye object. The pulsations of Mira variables cause the star to expand and contract, but also to change its temperature. The temperature is highest slightly after the visual maximum, and lowest slightly before minimum.
The photosphere, measured at the Rosseland radiusis smallest just before visual maximum and close to the time of maximum temperature. The largest size is reached slightly before the time of lowest temperature. In Mira, the highest luminosity occurs close to the time when the star is hottest and smallest.
The visual magnitude is determined both by the luminosity and by the Asian Miran of the radiation that occurs at visual wavelengths. Only a small proportion of the radiation is emitted at visual wavelengths and this proportion is very strongly influenced by the temperature Suprise Muthafucka law.
Combined with the overall luminosity changes, this creates the very big visual magnitude variation Familjeliv Trekant the maximum occurring when the temperature is high. The temperature at phase 0.
Ultraviolet studies of Mira Asian Miran NASA 's Galaxy Evolution Explorer GALEX space telescope have revealed that it sheds a trail of material from the outer envelope, leaving a tail 13 light-years in length, formed over tens of thousands of years.
Mira's bow-shock will eventually evolve into a planetary nebulathe form of which will be considerably affected by the motion through the interstellar medium ISM. The The companion's orbital period around Mira is approximately years. Inobservations showed Gratis Video Sex protoplanetary disc around the companion, Mira B. This disc is being accreted from material in the solar wind from Mira Suzie Q Boden could eventually form new planets.
These observations also hinted that the companion was a main sequence star of around 0. Coordinates : 02 h 19 m From Wikipedia, the free encyclopedia. Red giant star Omicron Ceti. For other uses, see Mira disambiguation. Main article: Mira B. Retrieved 28 July November Astronomy and Astrophysics.
S2CID General Catalogue of Variable Stars 3rd ed. Bibcode : GCVS3. The Astronomical Journal. Bibcode : AJ Astronomical Journal. June 20—24, Determination of Radial Velocities and Their Applications. University of Toronto: International Astronomical Union. Bibcode : IAUS United States Naval Observatory. Retrieved 22 January Astrophysical Journal, Part 1. Bibcode : ApJ CO line survey of evolved stars: Derivation of mass-loss rate formulae". Star Names: Their Lore and Meaning.
New York: Dover Publications. ISBN Retrieved 22 May New York: Dover Publications Inc. Astrophysics and Space Science. Ohio State University. Retrieved Bibcode : IAUS.
Structure and Evolution of Single and Binary Stars. Archived from the original on The Astrophysical Journal. Bibcode : Natur. PMID Scientific American. November 6, Astrophysical Journal Letters. Philosophical Transactions of the Royal Superstar Cartoon A.
Constellation of Cetus. List of stars in Cetus Cetus in Chinese astronomy. NGC SN E SN gj. Hidden categories: CS1 errors: missing periodical Articles with short description Short description is different from Wikidata All articles with unsourced statements Articles with unsourced statements from October Commons link is on Wikidata.
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Mira A is a pulsating variable star and was the first non- supernova variable star discovered, with the possible exception of Algol. It is the prototype of the Mira variables. Evidence that the variability of Mira was known in ancient China , Babylon or Greece is at best only circumstantial.
Miran, xinjiang uyghur autonomous region, china. In conversation with LIU Yunxiao: the air at Miran smells different – perhaps it is the desert, perhaps the mystery of long buried lives – whatever swirls around makes you yearn for the freshness of grass. Silence pervades such that you can hear the tiny movements of lizards scrambling across Estimated Reading Time: 6 mins.
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Jang Mi-ran Korean pronunciation: [tɕɐŋ. She broke the world records in the snatch with kg, in the clean and jerk with kg, and combined with kg. Mu Shuangshuang , who lifted kg in overalls as well, ranked second because of bodyweight, but broke the record an attempt earlier. With this medal, which was her first gold in Asian Games, she completed the weightlifting equivalent of a "grand slam" as champion in the Summer Olympics , world championships and Asian Games. In February , Jang announced the launch of her new foundation, Jang Miran Foundation, and stated that the mission of the Jang Miran Foundation is "[to help] young athletes in minor sports.