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υ Piscium
Upsilon Piscium is a solitary, white-hued star in the zodiac constellation of Pisces. It is faintly visible to the naked eye, having an apparent visual magnitude of +4.75. Based upon an annual parallax shift of as seen from Earth, it is located about 308 light years from the Sun. The star is drifting further away with a heliocentric radial velocity of +6 km/s. This is an ordinary A-type main sequence star with a stellar classification of A3 V. It is 461 million years old – about 98% of the way through its main sequence lifetime – and is spinning with a projected rotational velocity of 91 km/s. The star has 2.8 times the mass of the Sun, about 2.2 times the Sun's radius, and is radiating 117 times the Sun's luminosity from its photosphere at an effective temperature of 9183 K. Naming υ Piscium is the Bayer designation for this star, which is Latinized as Upsilon Piscium. It has the Flamsteed designation 90 Piscium. In Chinese, ... [...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] |
Photosphere
The photosphere is a star's outer shell from which light is radiated. It extends into a star's surface until the plasma becomes opaque, equivalent to an optical depth of approximately , or equivalently, a depth from which 50% of light will escape without being scattered. A photosphere is the region of a luminous object, usually a star, that is transparent to photons of certain wavelengths. Stars, except neutron stars, have no solid or liquid surface. Therefore, the photosphere is typically used to describe the Sun's or another star's visual surface. Etymology The term ''photosphere'' is derived from Ancient Greek roots, φῶς, φωτός/''phos'', ''photos'' meaning "light" and σφαῖρα/''sphaira'' meaning "sphere", in reference to it being a spherical surface that is perceived to emit light. Temperature The surface of a star is defined to have a temperature given by the effective temperature in the Stefan–Boltzmann law. Various stars have photospheres of vari ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nu Andromedae
Nu Andromedae is a binary star system in the constellation Andromeda. Its Bayer designation is Latinized from ν Andromedae, and abbreviated Nu And or ν And, respectively. The system has an apparent visual magnitude of 4.5, which is bright enough to be seen with the naked eye. Based on parallax measurements, it is located at a distance of approximately from Earth. The pair are drifting closer with a heliocentric radial velocity of –24 km/s. Situated just over a degree to the west of this star is the Andromeda Galaxy. Nu Andromedae is close spectroscopic binary A binary star or binary star system is a system of two stars that are gravitationally bound to and in orbit around each other. Binary stars in the night sky that are seen as a single object to the naked eye are often resolved as separate stars us ... system with a period of 4.2828 days and a nearly circular orbit. The primary component is a B-type main sequence star with a stellar class ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pi Andromedae
Pi Andromedae is a binary star A binary star or binary star system is a system of two stars that are gravitationally bound to and in orbit around each other. Binary stars in the night sky that are seen as a single object to the naked eye are often resolved as separate stars us ... system in the northern constellation of Andromeda (constellation), Andromeda. Its Bayer designation is Romanization of Greek, latinized from π Andromedae, and abbreviated Pi And or π And, respectively. With an apparent visual magnitude of 4.4, it is Bortle Dark-Sky Scale, visible to the naked eye. Based on stellar parallax, parallax measurements, it is located at a distance of approximately from Earth. The pair is classified as a blue-white stellar classification, B-type main sequence, main sequence dwarf, with an apparent magnitude of +4.34. It is a spectroscopic binary with an orbital period of 143.5 days and an orbital eccentricity, eccentricity of 0.54. The spectroscopi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Delta Andromedae
Delta Andromedae is a triple star system in the northern constellation of Andromeda. Its identifier is a Bayer designation that is Romanization of Greek, Latinized from δ Andromedae, and abbreviated Delta And or δ And, respectively. The system is visible to the naked eye as a point of light with a combined apparent visual magnitude of 3.28. Based upon stellar parallax, parallax measurements, it is located at a distance of approximately from the Sun. The system is drifting closer with a radial velocity of −10 km/s. In Chinese astronomy, Chinese, (), meaning ''Legs (Chinese constellation), Legs (asterism)'', refers to an asterism consisting of δ Andromedae, Eta Andromedae, η Andromedae, 65 Piscium, Zeta Andromedae, ζ Andromedae, Iota Piscium, ι Piscium, Epsilon Andromedae, ε Andromedae, Pi Andromedae, π Andromedae, Nu Andromedae, ν Andromedae, Mu Andromedae, μ Andromedae, Beta Andromedae, β Andromedae, Sigma Piscium, σ Piscium, Tau Piscium ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Epsilon Andromedae
Epsilon Andromedae is a star in the constellation of Andromeda. Its identifier is a Bayer designation that is Latinized from ε Andromedae, and abbreviated eps And or ε And, respectively. This star can be seen with the naked eye, having an apparent visual magnitude of 4.4. Based upon an annual parallax shift of 19.2 mas as seen from Earth, it is located approximately 169 light years from the Sun. The system is moving closer to the Sun with a radial velocity of −84 km/s. Its orbit in the Milky Way is highly eccentric, causing it to move rapidly relative to the Sun and its neighboring stars. This is an evolved G-type giant star with a stellar classification of . The suffix notation indicates there is a strong underabundance of iron in the spectrum, and an overabundance of cyanogen (CN). ε Andromedae is believed to be a red clump star which is fusing helium in its core. It has about the same mass as the Sun, but has expanded ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Zeta Andromedae
Zeta Andromedae, also named Shimu, is a binary star system in the northern constellation Andromeda (constellation), Andromeda. It is visible to the naked eye with an apparent visual magnitude that varies from over the course of its 17.7 day orbit. Based on stellar parallax, parallax measurements, it is located at a distance of approximately 181 light-years from the Sun. The system is drifting closer with a heliocentric radial velocity of −24.4 km/s. Naming The star's location is in the northern constellation Andromeda, in which it is the second-most southerly of the stars in this often drawn characteristic shape representing the mythical princess asterism (astronomy), asterism, after η Andromedae. Zeta Andromedae (Zeta And, ζ Andromedae, ζ And) is the star's Bayer designation. It also has the Flamsteed designation 34 Andromedae and multiple other designations in stellar catalogues. In Chinese astronomy, Chinese, (), meaning ''L ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
65 Piscium
This is the list of notable stars in the constellation A constellation is an area on the celestial sphere in which a group of visible stars forms Asterism (astronomy), a perceived pattern or outline, typically representing an animal, mythological subject, or inanimate object. The first constellati ... Pisces, sorted by decreasing brightness. See also * List of stars by constellation References * * * * * {{Stars of Pisces *List Pisces ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eta Andromedae
Eta Andromedae, also named Kui, is a spectroscopic binary star system in the northern constellation of Andromeda. It consists of two G-type evolved stars orbiting each other with a period of 115.7 days and has an overall apparent visual magnitude of approximately 4.403. Based on parallax measurements, this system is located at a distance of approximately 260 light years from the Sun. But it is drawing closer with a heliocentric radial velocity of −10.30 km/s. This star was discovered to be a double-lined spectroscopic binary in a series of spectra taken in 1899 and 1900. Its orbit was computed in 1946 from spectroscopic observations. Because spectroscopy only reveals the radial velocity of a star towards or away from the viewer, such a computation does not determine all orbital elements. In observations made from 1990 to 1992, Eta Andromedae was resolved interferometrically by the Mark III Stellar Interferometer at Mount Wilson Observatory, Califor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Legs (Chinese Constellation)
The Legs mansion (奎宿, pinyin: Kuí Xiù) is one of the Twenty-Eight Mansions of the Chinese constellations. It is one of the western mansions of the White Tiger. The constellation Kui within the lunar mansion consists of 16 stars in the Western constellations Andromeda and Pisces. An older name of the constellation, dating back to the Neolithic, was Tianshi (天豕), the Celestial Pig, with Zeta Andromedae as the pig's eye. Zeta Andromedae was originally the determinative star of Kui, but this became Eta Andromedae during the Qing dynasty. Cultural significance In East Asian cultures, the Legs mansion (Kuí Xiù) represents wisdom, scholarship and literature. A notable example is a structure known as "Kuiwen Pavilion" (奎文閣) in the many Confucius temples in China and other East Asian countries. A jade Jade is an umbrella term for two different types of decorative rocks used for jewelry or Ornament (art), ornaments. Jade is often referred to by either of t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chinese Astronomy
Astronomy in China has a long history stretching from the Shang dynasty, being refined over a period of more than 3,000 years. The Ancient China, ancient Chinese people have identified stars from 1300 BCE, as Chinese star names later categorized in the twenty-eight mansions have been found on oracle bones unearthed at Anyang, dating back to the mid-Shang dynasty. The core of the "mansion" (宿 ''xiù'') system also took shape around this period, by the time of King Wu Ding (1250–1192 BCE). Detailed records of astronomical observations began during the Warring States period (fourth century BCE). They flourished during the Han period (202 BCE – 220 CE) and subsequent dynasties with the publication of star catalogues. Chinese astronomy was equatorial, centered on close observation of circumpolar stars, and was based on different principles from those in traditional Western astronomy, where heliacal risings and settings of zodiac constellations formed the basic ecliptic framew ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flamsteed Designation
A Flamsteed designation is a combination of a number and constellation name that uniquely identifies most naked eye stars in the 88 modern constellations, modern constellations visible from southern England. They are named after John Flamsteed, author of the ''Historia Coelestis Britannica'', the first major star catalogue compiled with the aid of a telescope. Flamsteed’s own catalogue did not include what are now known as Flamsteed numbers, but its listing of stars in each constellation provided the basis for later astronomers to add them. Description Flamsteed designations for stars are similar to Bayer designations, except that they use numbers instead of Greek and Roman letters. Each star is assigned a number and the Latin genitive of the constellation it lies in (see 88 modern constellations for a list of constellations and the genitive forms of their names). Flamsteed designations were assigned to 2554 stars. The numbers were originally assigned in order of increasing righ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
