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V381 Cephei
V381 Cephei (HR 8164) is a triple star system in the northern constellation of Cepheus. Its apparent magnitude is slightly variable between 5.5 and 5.7. It is faintly visible to the naked eye under good observing conditions. The star was discovered to be a variable star in 1991, by Elaine M. Halbedel. It was given its variable star designation, V381 Cephei, in 1995. System V381 Cephei is a visual double star with components A and B separated by 4.6". The primary is HD 203338 and the secondary is the magnitude 9.2 HD 203339. HD 203338 is itself a spectroscopic binary with components Aa and Ab orbiting every 280 years. It forms a VV Cephei VV Cephei, also known as HD 208816, is an eclipsing binary star system located in the constellation Cepheus. It is both a B star and shell star. As a 5th magnitude star, it is visible to the naked eye under good observing condition ...-type binary system with a hot companion which is accreting mass from the primary ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
J2000
In astronomy, an epoch or reference epoch is a moment in time used as a reference point for some time-varying astronomical quantity. It is useful for the celestial coordinates or orbital elements of a celestial body, as they are subject to perturbations and vary with time. These time-varying astronomical quantities might include, for example, the mean longitude or mean anomaly of a body, the node of its orbit relative to a reference plane, the direction of the apogee or aphelion of its orbit, or the size of the major axis of its orbit. The main use of astronomical quantities specified in this way is to calculate other relevant parameters of motion, in order to predict future positions and velocities. The applied tools of the disciplines of celestial mechanics or its subfield orbital mechanics (for predicting orbital paths and positions for bodies in motion under the gravitational effects of other bodies) can be used to generate an ephemeris, a table of values giving ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Variable Star Designation
In astronomy, a variable-star designation is a unique identifier given to variable stars. It extends the Bayer designation format, with an identifying label (as described below) preceding the Latin genitive of the name of the constellation in which the star lies. The identifying label can be one or two Latin letters or a ''V'' plus a number (e.g. V399). Examples are R Coronae Borealis, YZ Ceti, V603 Aquilae. (''See'' List of constellations ''for a list of constellations and the genitive forms of their names''.) Naming The current naming system is: * Stars with existing Greek letter Bayer designations are not given new designations. * Otherwise, start with the letter R and go through Z. * Continue with RR–RZ, then use SS–SZ, TT–TZ and so on until ZZ. * After ZZ return to the beginning of the Latin alphabet and use AA–AZ, BB–BZ, CC–CZ, and so on, until reaching QZ, but omitting the letter J in either first or second position. * Abandon the Latin letters after all ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Slow Irregular Variables
Slow may refer to various basic dictionary-related meanings: * Slow velocity, the rate of change of position of a moving body ** Slow speed, in kinematics, the magnitude of the velocity of an object * Slow tempo, the speed or pace of a piece of music * Slow motion, an effect in film-making * Slow reaction rate, the speed at which a chemical reaction takes place Slow, SLOW, Slowing or Slowness may also refer to: Music * Slow (band), a 1980s Canadian band Albums * ''Slow'' (Richie Kotzen album), 2001 * ''Slow'' (Starflyer 59 album), 2016 * ''Slow'' (Luna Sea album), 2005 * ''Slow'' (Ann Hampton Callaway album), 2004 * ''Slowness'' (album), an album by cantopop singer Kay Tse Songs * "Slow" (Kylie Minogue song), 2003 * "Slow" (Rumer song), 2010 * "Slow" (Matoma song), 2017 * "Slow" (Jackson Wang & Ciara song), 2023 * "Slow" (Black Midi song), 2021 * "Slow", song by The Fratellis from the album ''Eyes Wide, Tongue Tied'' (2015) * "Slow", song by Lisa Mitchell from the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
2MASS Objects
Mass is an intrinsic property of a body. It was traditionally believed to be related to the quantity of matter in a body, until the discovery of the atom and particle physics. It was found that different atoms and different elementary particles, theoretically with the same amount of matter, have nonetheless different masses. Mass in modern physics has multiple definitions which are conceptually distinct, but physically equivalent. Mass can be experimentally defined as a measure of the body's inertia, meaning the resistance to acceleration (change of velocity) when a net force is applied. The object's mass also determines the strength of its gravitational attraction to other bodies. The SI base unit of mass is the kilogram (kg). In physics, mass is not the same as weight, even though mass is often determined by measuring the object's weight using a spring scale, rather than balance scale comparing it directly with known masses. An object on the Moon would weigh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
