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Epsilon Piscis Austrini
Epsilon Piscis Austrini, Latinized from ε Piscis Austrini, is a blue-white hued star in the southern constellation of Piscis Austrinus. It is visible to the naked eye with an apparent visual magnitude of +4.17. Based upon an annual parallax shift of 8.0981 ± 0.3582 mas as seen from the GAIA satellite, the system is located roughly 400 light years from the Sun. This is a B-type main sequence star with a stellar classification of B8 Ve. It is a Be star that is spinning rapidly with a projected rotational velocity of 216 km/s, compared to an equatorial critical velocity of 301 km/s. The star has 4.1 times the mass of the Sun and is radiating 661 times the solar luminosity from its photosphere at an effective temperature of 11,066 K. Epsilon Piscis Austrini is moving through the Galaxy at a speed of 18.7 km/s relative to the Sun. Its projected Galactic orbit carries it between and from the center of the Galaxy. Naming In Chinese, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
J2000
In astronomy, an epoch or reference epoch is a instant, 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 Astronomical object, celestial body, as they are subject to Perturbation (astronomy), 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 Perihelion and aphelion, 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 bodi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Photosphere
The photosphere is a star's outer shell from which light is radiated. The term itself 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. 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 deepest region of a luminous object, usually a star, that is transparent to photons of certain wavelengths. Temperature The surface of a star is defined to have a temperature given by the effective temperature in the Stefan–Boltzmann law. 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. Composition of the Sun The Sun is composed primarily of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Upsilon Aquarii
Upsilon Aquarii, Latinized from υ Aquarii, is the Bayer designation for a binary star system in the equatorial constellation of Aquarius. It is visible to the naked eye as a faint star with an apparent visual magnitude of 5.21. Parallax measurements give a distance estimate of from Earth. This is a high proper-motion star that is drifting closer to the Sun with a radial velocity of –2.3 km/s. It is part of the Hercules-Lyra association. The primary component is an F-type main sequence star with a stellar classification of F7 V. It is less than a billion years old and is spinning with a projected rotational velocity of 35 km/s. The star has 1.4 times the mass of the Sun and 1.5 times the Sun's radius. It is radiating 3.6 times the Sun's luminosity from its photosphere at an effective temperature of 6,597 K, giving it the yellow-white hue of an F-type star. The star displays an excess of near infrared radiation, suggesting it has a circumste ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
20 Piscis Austrini
Piscis Austrinus is a constellation in the southern celestial hemisphere. The name is Latin for "the southern fish", in contrast with the larger constellation Pisces, which represents a pair of fish. Before the 20th century, it was also known as Piscis Notius. Piscis Austrinus was one of the 48 constellations listed by the 2nd-century astronomer Ptolemy, and it remains one of the 88 modern constellations. The stars of the modern constellation Grus once formed the "tail" of Piscis Austrinus. In 1597 (or 1598), Petrus Plancius carved out a separate constellation and named it after the crane. It is a faint constellation, containing only one star brighter than 4th magnitude: Fomalhaut, which is 1st magnitude and the 18th-brightest star in the night sky. Fomalhaut is surrounded by a circumstellar disk, and possibly hosts a planet. Other objects contained within the boundaries of the constellation include Lacaille 9352, the brightest red dwarf star in the night sky (though still too f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
21 Piscis Austrini ...
This is the list of notable stars in the constellation Piscis Austrinus, sorted by decreasing brightness. See also *List of stars by constellation References * * * * * {{Stars of Piscis Austrinus *List Piscis Austrinus Piscis Austrinus is a constellation in the southern celestial hemisphere. The name is Latin for "the southern fish", in contrast with the larger constellation Pisces, which represents a pair of fish. Before the 20th century, it was also known as ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lambda Piscis Austrini
Lambda Piscis Austrini, Latinized from λ Piscis Austrini, is a solitary star in the southern constellation of Piscis Austrinus. It has a blue-white hue and is visible to the naked eye with an apparent visual magnitude of +5.42. Based upon an annual parallax shift of 6.51 mas as measured from Earth, it is located around 500 light years from the Sun. At that distance, the visual magnitude of the star is diminished by an extinction factor of 0.16 due to interstellar dust. This is a B-type main sequence star with a stellar classification of B7 V. It has an estimated 3.58 times the mass of the Sun and about 4.2 times the Sun's radius. The star is spinning with a projected rotational velocity of 50 km/s and is 76% of the way through its main sequence lifetime. It is radiating 249 times the solar luminosity from its photosphere at an effective temperature of 12,023 K. Lambda Piscis Austrini is moving through the Galaxy at a speed of 18.1&n ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
49 Aquarii
49 Aquarii, abbreviated 49 Aqr, is a star in the zodiac constellation of Aquarius. ''49 Aquarii'' is its Flamsteed designation. It is a dim star with an apparent visual magnitude of 5.53. The distance to 49 Aqr, as determined from its annual parallax shift of , is 266 light years. It is moving closer to the Earth with a heliocentric radial velocity of −13 km/s. This is an aging K-type giant star with a stellar classification of . It shows a spectral anomaly with the absorption lines of cyanogen (CN). This is a red clump giant, indicating that it is generating energy through the helium fusion at its core. It is around 950 million years old with 2.2 times the mass of the Sun and has expanded to nine times the Sun's radius. It is radiating 50 times the Sun's luminosity from its enlarged photosphere at an effective temperature The effective temperature of a body such as a star or planet is the temperature of a black body that would emit the same total amoun ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
47 Aquarii
47 Aquarii, abbreviated 47 Aqr, is a star in the zodiac constellation of Aquarius. ''47 Aquarii'' is its Flamsteed designation. It is a faint star but visible to the naked eye in good seeing conditions, having an apparent visual magnitude of 5.135. Based upon an annual parallax shift of , it is located 181 light years away. At that distance, the visual magnitude of the star is diminished by an extinction of 0.088 due to interstellar dust. It is moving further from the Earth with a heliocentric radial velocity of +48 km/s. This is an evolved giant star currently on the red giant branch with a stellar classification of K0 III. The star has 1.35 times the mass of the Sun and has expanded to 7.86 times the Sun's radius. It is radiating 30 times the Sun's luminosity from its enlarged photosphere at an effective temperature The effective temperature of a body such as a star or planet is the temperature of a black body that would emit the same total amount of ele ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
41 Aquarii
41 Aquarii is a double star in the equatorial constellation of Aquarius. ''41 Aquarii'' is its Flamsteed designation. It is visible to the naked eye as a dim, orange-hued point of light with a combined apparent visual magnitude of 5.354. The pair are located at a distance of around from the Sun based on parallax, but are drifting closer with a radial velocity of –25 km/s. The brighter component of the pair is a red clump giant star with a stellar classification of K0 III and a magnitude of 5.73. This is an aging star that has exhausted the supply of hydrogen at its core and is now generating energy through core helium fusion. It has eight times the girth of the Sun and is radiating 34 times the luminosity of the Sun at an effective temperature of 4,750 K. At an angular separation of 5.148 arcseconds, the fainter companion is an F-type main sequence star An F-type main-sequence star (F V) is a main-sequence, hydrogen-fusing star of spectral type F ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
35 Aquarii
35 Aquarii is a single star located roughly 2,200 light years away from the Sun in the zodiac constellation of Aquarius. ''35 Aquarii'' is its Flamsteed designation. It is visible to the naked eye as a dim, blue-white hued star with an apparent visual magnitude of 5.80. This object is moving closer to the Earth with a heliocentric radial velocity of −7 km/s, and is a suspected runaway star that may have been ejected from an open cluster as the result of a binary–binary interaction. This is a blue giant star with a stellar classification of B2 III;, a massive star that has evolved off the main sequence. It is around 22.5 million years old with a relatively low projected rotational velocity of 10 km/s. The star has 10 times the mass of the Sun and is radiating 1,622 times the Sun's luminosity from its photosphere at an effective temperature The effective temperature of a body such as a star or planet is the temperature of a black body that would ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
29 Aquarii
29 Aquarii is a binary star system located around 590 light years away from the Sun in the equatorial constellation of Aquarius. ''29 Aquarii'' is the Flamsteed designation; the system also bears the variable star designation DX Aquarii. It is a challenge to view with the naked eye, appearing as a dim star with a combined apparent visual magnitude of 6.39. The system is moving further from the Earth with a heliocentric radial velocity of about +15 km/s. This is a spectroscopic binary system with a close circular orbit taking just 0.945 days to complete. Despite their proximity, this does not appear to be a contact binary system. The orbital plane of the two stars lies near the line of sight, so they form an Algol-type eclipsing binary. The first component of the system is an A-type main sequence star with a stellar classification of A2 V. Its companion is giant star with a classification of K0 III. The variability of this system was first notice ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
