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List Of Smallest Known Stars
This is a list of the smallest known stars, brown dwarfs and stellar remnants, sorted by increasing size. The list is divided into sublists, and contain notable objects up to 350,000 km in radius, or , as well as all red dwarfs smaller than and all neutron stars with accurately measured radii. 0 to 1,000 km Partial list contaning stars up to 0.0014 . 1,000 to 50,000 km Partial list contaning stars from 0.0014 to 0.0718 . } , - , Gamma Cassiopeiae Ab , , , , , - , LP 658-2 , , , , , - , BZ Ursae Majoris A , 6,880 , , , , - , Gliese 915 , , , , , - , AE Aquarii A , , 0.01 , First discovered white dwarf pulsar. , , - , AR Scorpii A , 7,000 , , A white dwarf pulsar. It is often mistaken as the first discovered white dwarf pulsar. , , - , QS Virginis A , , , , , - , YZ Leonis Minoris , , 0.01 , , , - , GW Librae , , , , , - , WZ Sagittae , , , , , - , TMTS J052610.43+593445.1 A , , 0.011 , , , - , G 99-47 , 7,650 , , , , - , EX Hyd ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Star
A star is a luminous spheroid of plasma (physics), plasma held together by Self-gravitation, self-gravity. The List of nearest stars and brown dwarfs, nearest star to Earth is the Sun. Many other stars are visible to the naked eye at night sky, night; their immense distances from Earth make them appear as fixed stars, fixed points of light. The most prominent stars have been categorised into constellations and asterism (astronomy), asterisms, and many of the brightest stars have proper names. Astronomers have assembled star catalogues that identify the known stars and provide standardized stellar designations. The observable universe contains an estimated to stars. Only about 4,000 of these stars are visible to the naked eye—all within the Milky Way galaxy. A star's life star formation, begins with the gravitational collapse of a gaseous nebula of material largely comprising hydrogen, helium, and traces of heavier elements. Its stellar mass, total mass mainly determines it ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
GW170817
GW170817 was a gravitational wave (GW) observed by the LIGO and Virgo detectors on 17 August 2017, originating within the shell elliptical galaxy NGC 4993, about 144 million light years away. The wave was produced by the last moments of the inspiral of a binary pair of neutron stars, ending with their merger. , it is the only GW detection to be definitively correlated with any electromagnetic observation. Unlike the five prior GW detections—which were of merging black holes and thus not expected to have detectable electromagnetic signals—the aftermath of this merger was seen across the electromagnetic spectrum by 70 observatories on 7 continents and in space, marking a significant breakthrough for multi-messenger astronomy. The discovery and subsequent observations of GW170817 were given the Breakthrough of the Year award for 2017 by the journal ''Science''. GW170817 had an audible duration of approximately 100 seconds and exhibited the characteristic intensity an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ZTF J1901+1458
The Zwicky Transient Facility (ZTF, obs. code: I41) is a wide-field sky astronomical survey using a new camera attached to the Samuel Oschin Telescope at Palomar Observatory in San Diego County, California, United States. Commissioned in 2018, it supersedes the (Intermediate) Palomar Transient Factory (2009–2017) that used the same observatory code. It is named after the Swiss astronomer Fritz Zwicky. Description Observing in visible and infrared wavelengths, the Zwicky Transient Facility is designed to detect transient objects that rapidly change in brightness, for example supernovae, gamma ray bursts, and collision between two neutron stars, and moving objects like comets and asteroids. The new camera is made of 16 CCDs of 6144×6160 pixels each, enabling each exposure to cover an area of 47 square degrees. The Zwicky Transient Facility is designed to image the entire northern sky in three nights and scan the plane of the Milky Way twice each night to a limiting magni ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
White Dwarf
A white dwarf is a Compact star, stellar core remnant composed mostly of electron-degenerate matter. A white dwarf is very density, dense: in an Earth sized volume, it packs a mass that is comparable to the Sun. No nuclear fusion takes place in a white dwarf; what light it radiates is from its residual heat. The nearest known white dwarf is Sirius B, at 8.6 light years, the smaller component of the Sirius binary star. There are currently thought to be eight white dwarfs among the hundred star systems nearest the Sun. The unusual faintness of white dwarfs was first recognized in 1910. The name ''white dwarf'' was coined by Willem Jacob Luyten in 1922. White dwarfs are thought to be the final stellar evolution, evolutionary state of stars whose mass is not high enough to become a neutron star or black hole. This includes over 97% of the stars in the Milky Way. After the hydrogen-stellar nucleosynthesis, fusing period of a main sequence, main-sequence star of Stellar mass, lo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
HD 49798
HD 49798 is a binary star in the constellation Puppis about from Earth. It has an apparent magnitude of 8.3, making it one of the brightest known O class subdwarf stars. HD 49798 was discovered in 1964 to be a rare hydrogen-deficient O class subdwarf, and was the brightest known at the time. This was identified as a binary star, but the companion could not be detected visually or spectroscopically. The X-ray source RX J0648.0-4418 was discovered close to HD 49798's location in the sky. Only the space telescope XMM-Newton was able to identify the source. It is a white dwarf with about 1.3 solar masses, in orbit about HD 49798 and rotating once every 13 seconds; this rotation is speeding up by per year. This is detected from the 13-second X-ray pulse, which results from the stellar wind accreting onto the compact object. It has been proposed that the white dwarf is surrounded by a debris disk. In this model, the material of the disk would be funneled onto the pol ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ZTF J1406+1422
The Zwicky Transient Facility (ZTF, obs. code: I41) is a wide-field sky astronomical survey using a new camera attached to the Samuel Oschin Telescope at Palomar Observatory in San Diego County, California, United States. Commissioned in 2018, it supersedes the (Intermediate) Palomar Transient Factory (2009–2017) that used the same observatory code. It is named after the Swiss astronomer Fritz Zwicky. Description Observing in visible and infrared wavelengths, the Zwicky Transient Facility is designed to detect transient objects that rapidly change in brightness, for example supernovae, gamma ray bursts, and collision between two neutron stars, and moving objects like comets and asteroids. The new camera is made of 16 CCDs of 6144×6160 pixels each, enabling each exposure to cover an area of 47 square degrees. The Zwicky Transient Facility is designed to image the entire northern sky in three nights and scan the plane of the Milky Way twice each night to a limiting magni ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
PSR J0740+6620
PSR may refer to: Organizations * Pacific School of Religion, Berkeley, California, US * Palestinian Center for Policy and Survey Research * Payment Systems Regulator in the United Kingdom * Physicians for Social Responsibility, US Political parties * Revolutionary Socialist Party (Portugal) (''Partido Socialista Revolucionário'') * Romanian Socialist Party (present-day) * Polish Reason of State Places * Abruzzo Airport (IATA airport code), near Pescara, Italy * Pasir Ris MRT station (MRT station abbreviation), Singapore * Pioneer Scout Reservation, a Boy Scout camp in Ohio, US Science and technology * Pulsar, a kind of star * Primary radar * Perimeter surveillance radar * Posthumous sperm retrieval, from dead men Computing * PHP Standard Recommendation * Predictive state representation of a system * Problem Steps Recorder, psr.exe, a Microsoft utility * Panel self-refresh, in Embedded DisplayPort Law enforcement and military * US Precision Sniper Rifle *PSR-90, a Pakista ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
PSR J1614−2230
PSR J1614–2230 is a pulsar in a binary system with a white dwarf in the constellation Scorpius. It was discovered in 2006 with the Parkes telescope in a survey of unidentified gamma ray sources in the Energetic Gamma Ray Experiment Telescope catalog. PSR J1614–2230 is a millisecond pulsar, a type of neutron star, that spins on its axis roughly 317 times per second, corresponding to a period of 3.15 milliseconds. Like all pulsars, it emits radiation in a beam, similar to a lighthouse. Emission from PSR J1614–2230 is observed as pulses at the spin period of PSR J1614–2230. The pulsed nature of its emission allows for the arrival of individual pulses to be timed. By measuring the arrival time of pulses, astronomers observed the delay of pulse arrivals from PSR J1614–2230 when it was passing behind its companion from the vantage point of Earth. By measuring this delay, known as the Shapiro delay, astronomers determined the mass of PSR J1614–2230 and its companion. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vela Pulsar
The Vela Pulsar (PSR J0835-4510 or PSR B0833-45) is a radio, optical, X-ray- and Gamma ray, gamma-emitting pulsar associated with the Vela Supernova Remnant in the constellation of Vela (constellation), Vela. Its parent Type II supernova exploded approximately 11,000–12,300 years ago (and was about 800 light-years away). Characteristics Vela is the brightest pulsar (at radio frequencies) in the sky and spins 11 times per second (i.e. a period of 89.33 milliseconds—the shortest known at the time of its discovery) and the remnant from the supernova explosion is estimated to be travelling outwards at . It has the third-brightest optical component of all known pulsars (V = 23.6 mag) which pulses twice for every single radio pulse. The Vela pulsar is the brightest persistent object in the high-energy gamma-ray sky. Pulsed emission up to 20 Teraelectronvolt, TeV has been detected from the Vela pulsar and together with the Crab Pulsar, Crab pulsar at 1.5 TeV these are the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
4U 1702−429
{{Letter-NumberCombDisambig ...
4U or 4 U may refer to: Music * ''4U'' (album), by Elva Hsiao, 2002 * ''4U'' (Christina Milian EP), 2015 * ''4 U'' (Cody Simpson EP), 2010 * '' 4U: Outside'', an EP by BtoB, 2021 * "4U", a song by Aero Chord, 2015 * "4U", a song by Blackbear from ''Deadroses'', 2015 * "4 U", a song by Korn from '' Issues'', 1999 * "4U", a song by Pi'erre Bourne from ''The Life of Pi'erre 5'', 2021 Other uses * Germanwings (former IATA code: 4U), a former German low-cost airline subsidiary of Lufthansa * 4U, a rack unit size * 4U, the final (4th) catalog of Uhuru x-ray sources See also * U4 (other) * For You (other) For You may refer to: Albums * ''For You'' (Casey Donovan album), or the title song, 2004 * ''For You'' (Frankmusik album), 2015 * ''For You'' (Selena Gomez album), 2014 * ''For You'' (Eddie Kendricks album), 1974 * ''For You'' (Crystal Kay ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
PSR J0952–0607
PSR J0952–0607 is a massive millisecond pulsar in a binary system, located between from Earth in the constellation (astronomy), constellation Sextans. , it holds the record for being the most massive neutron star known, with a mass times that of the Sun—potentially close to the Tolman–Oppenheimer–Volkoff limit, Tolman–Oppenheimer–Volkoff mass upper limit for neutron stars. The pulsar rotates at a frequency of (a period of ), making it the second-fastest-spinning pulsar known, and the fastest-spinning pulsar known within the Milky Way. PSR J0952–0607 was discovered by the Low-Frequency Array (LOFAR) radio telescope during a search for pulsars in 2016. It is classified as a black widow pulsar, a type of pulsar harboring a closely-orbiting substellar object, substellar-mass companion that is being Ablation, ablated by the pulsar's intense high-energy solar winds and gamma-ray emissions. The pulsar's high-energy emissions have been detected in gamma-ray a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
PSR J1933-6211
PSR may refer to: Organizations * Pacific School of Religion, Berkeley, California, US * Palestinian Center for Policy and Survey Research * Payment Systems Regulator in the United Kingdom * Physicians for Social Responsibility, US Political parties * Revolutionary Socialist Party (Portugal) (''Partido Socialista Revolucionário'') * Romanian Socialist Party (present-day) * Polish Reason of State Places * Abruzzo Airport (IATA airport code), near Pescara, Italy * Pasir Ris MRT station (MRT station abbreviation), Singapore * Pioneer Scout Reservation, a Boy Scout camp in Ohio, US Science and technology * Pulsar, a kind of star * Primary radar * Perimeter surveillance radar * Posthumous sperm retrieval, from dead men Computing * PHP Standard Recommendation * Predictive state representation of a system * Problem Steps Recorder, psr.exe, a Microsoft utility * Panel self-refresh, in Embedded DisplayPort Law enforcement and military * US Precision Sniper Rifle *PSR-90, a Pakistani ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
