3C 234 | |
---|---|
![]() | |
Observation data (Epoch J2000) | |
Constellation | Leo Minor |
Right ascension | 10h 01m 49.501s [1] |
Declination | +28° 47′ 08.98″ [1] |
Redshift | 0.184925 [2] |
Distance | 733 megaparsecs (2.39×109 ly) h −1 0.73 [2] |
Type | Sy1, Rad, AGN, QSO, IR, G, blu, X, gam [1] G [2] |
Apparent magnitude (V) | 17.27 [1] |
Other designations | |
DA 280, LEDA 139234, 4C 29.35, QSO B0958+290 | |
See also: Quasar, List of quasars |
3C 234 is a Seyfert galaxy [1] with a quasar-like appearance located in the constellation Leo Minor.
Protactinium is a radioactive chemical element with the symbol Pa and atomic number 91. It is a dense, silvery-gray actinide metal which readily reacts with oxygen, water vapor and inorganic acids. It forms various chemical compounds in which protactinium is usually present in the oxidation state +5, but it can also assume +4 and even +3 or +2 states. Concentrations of protactinium in the Earth's crust are typically a few parts per trillion, but may reach up to a few parts per million in some uraninite ore deposits. Because of its scarcity, high radioactivity and high toxicity, there are currently no uses for protactinium outside scientific research, and for this purpose, protactinium is mostly extracted from spent nuclear fuel.
The Boeing CH-47 Chinook is a tandem rotor helicopter developed by American rotorcraft company Vertol and manufactured by Boeing Vertol. The Chinook is a heavy-lift helicopter that is among the heaviest lifting Western helicopters. Its name, Chinook, is from the Native American Chinook people of Oregon and Washington state.
A decimal separator is a symbol used to separate the integer part from the fractional part of a number written in decimal form. Different countries officially designate different symbols for use as the separator. The choice of symbol also affects the choice of symbol for the thousands separator used in digit grouping.
Sculptor is a small and faint constellation in the southern sky. It represents a sculptor. It was introduced by Nicolas Louis de Lacaille in the 18th century. He originally named it Apparatus Sculptoris, but the name was later shortened.
The Arado Ar 234 Blitz is a jet-powered bomber designed and produced by the German aircraft manufacturer Arado. It was the world's first operational turbojet-powered bomber, seeing service during the final years of Second World War.
A centenarian is a person who has reached the age of 100 years. Because life expectancies worldwide are below 100, the term is invariably associated with longevity. The United Nations in 2012 estimated that there were 316,600 living centenarians worldwide.
Uranium-238 is the most common isotope of uranium found in nature, with a relative abundance of 99%. Unlike uranium-235, it is non-fissile, which means it cannot sustain a chain reaction in a thermal-neutron reactor. However, it is fissionable by fast neutrons, and is fertile, meaning it can be transmuted to fissile plutonium-239. 238U cannot support a chain reaction because inelastic scattering reduces neutron energy below the range where fast fission of one or more next-generation nuclei is probable. Doppler broadening of 238U's neutron absorption resonances, increasing absorption as fuel temperature increases, is also an essential negative feedback mechanism for reactor control.
An admiral of the fleet or shortened to fleet admiral is a senior naval flag officer rank, usually equivalent to Field marshal and Marshal of the air force. An admiral of the fleet is typically senior to an admiral.
Uranium (92U) is a naturally occurring radioactive element that has no stable isotope. It has two primordial isotopes, uranium-238 and uranium-235, that have long half-lives and are found in appreciable quantity in the Earth's crust. The decay product uranium-234 is also found. Other isotopes such as uranium-233 have been produced in breeder reactors. In addition to isotopes found in nature or nuclear reactors, many isotopes with far shorter half-lives have been produced, ranging from 214U to 242U. The standard atomic weight of natural uranium is 238.02891(3).
Protactinium (91Pa) has no stable isotopes. The four naturally occurring isotopes allow a standard atomic weight to be given.
Berkelium (97Bk) is an artificial element, and thus a standard atomic weight cannot be given. Like all artificial elements, it has no stable isotopes. The first isotope to be synthesized was 243Bk in 1949. There are 20 known radioisotopes, from 230Bk and 233Bk to 253Bk, and 6 nuclear isomers. The longest-lived isotope is 247Bk with a half-life of 1,380 years.
The 1852–53 United States House of Representatives elections were held on various dates in various states between August 2, 1852 and November 8, 1853. Each state set its own date for its elections to the House of Representatives before the first session of the 33rd United States Congress convened on December 5, 1853. The size of the House increased to 234 seats following the congressional reapportionment based on the 1850 United States Census.
The 234th Infantry Brigade was an infantry brigade of the British Army, raised during the First World War, and was later reformed during the Second World War.
The Morane-Saulnier MS.230 aircraft was the main elementary trainer for the French Armée de l'Air throughout the 1930s. Almost all French pilots flying for the Armée de l'Air at the outbreak of World War II had had their earliest flight training in this machine. It was the equivalent of the Stearman trainer in the United States air services and the de Havilland Tiger Moth in the British Royal Air Force.
75th Division was an infantry division of the British Army in World War I. It was raised in the field by the Egyptian Expeditionary Force (EEF) in 1917 and it included British, Indian and South African troops. It served in the Middle East during the Sinai and Palestine Campaign being involved in the Battles of Megiddo.
N-body units are a completely self-contained system of units used for N-body simulations of self-gravitating systems in astrophysics. In this system, the base physical units are chosen so that the total mass, M, the gravitational constant, G, and the virial radius, R, are normalized. The underlying assumption is that the system of N objects (stars) satisfies the virial theorem. The consequence of standard N-body units is that the velocity dispersion of the system, v, is and that the dynamical or crossing time, t, is . The use of standard N-body units was advocated by Michel Hénon in 1971. Early adopters of this system of units included H. Cohn in 1979 and D. Heggie and R. Mathieu in 1986. At the conference MODEST14 in 2014, D. Heggie proposed that the community abandon the name "N-body units" and replace it with the name "Hénon units" to commemorate the originator.
Shyambazar is a station of the Kolkata Metro located in the Shyambazar area. It is the sixth metro station of Line 1 of Kolkata Metro from the north.
S Microscopii is a star in the constellation Microscopium. It is a red giant star of spectral type M3e-M5.5 that is also a Mira variable, with an apparent magnitude ranging between 7.4 and 14.8 over 210 days. The Astronomical Society of Southern Africa in 2003 reported that observations of S Microscopii were very urgently needed as data on its light curve was incomplete.
A-234 is an organophosphate nerve agent. It was developed in the Soviet Union under the FOLIANT program and is one of the group of compounds referred to as Novichok agents that were revealed by Vil Mirzayanov. In March 2018 the Russian ambassador to the UK, Alexander Yakovenko, claimed to have been informed by British authorities that A-234 had been identified as the agent used in the poisoning of Sergei and Yulia Skripal. Vladimir Uglev, one of the inventors of the Novichok series of compounds, said he was "99 percent sure that it was A-234" in relation to the 2018 Amesbury poisonings, noting its unusually high persistence in the environment.
Serge Rezvani is a French painter, engraver, writer, as well as a songwriter-composer-performer He is also known by his pseudonym Cyrus Bassiak.