| Observation data Epoch J2000.0 |
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|---|---|
| Constellation (pronunciation) |
Cassiopeia |
| Right ascension | 02h 49m 44. In Astronomy, an epoch is a moment in time used as a reference for the Orbital elements of a Celestial body. In Astronomy, an epoch is a moment in time used as a reference for the Orbital elements of a Celestial body. In common usage a constellation is a group of celestial bodies that are connected together in some arrangement typically stars to form a visible figure or picture Each culture has its own Constellations usually based on Mythology. Cassiopeia ( colloquially /ˌkæsiˈoʊpiə/ is a northern Constellation which Greek mythology considered to represent the vain queen Cassiopeia who boasted Right ascension (abbrev RA; symbol α) is the Astronomical term for one of the two Coordinates of a point on the Celestial sphere 49s |
| Declination | +71° 45′ 11. In Astronomy, declination (abbrev dec or δ) is one of the two coordinates of the Equatorial coordinate system, the other being either 64″ |
| Apparent magnitude (V) | 8. The apparent magnitude ( m) of a celestial body is a measure of its Brightness as seen by an observer on Earth, normalized to the value 17 |
| Absolute magnitude (V) | 3. In Astronomy, absolute magnitude (also known as absolute visual magnitude) is the Apparent magnitude an object would have if it were at a standard 70 |
| Distance | 255. The cosmic distance ladder (also known as the Extragalactic Distance Scale) is the succession of methods by which astronomers determine the Distances to celestial 19 ly (78. A light-year or light year (symbol ly) is a unit of Length, equal to just under ten trillion Kilometres As defined by 24 pc) |
| Spectral type | G0IV |
| Other designations | |
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BD+71°171, HIP 13192, SAO 4737
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HD 17156 is a star in the constellation Cassiopeia. History The first direct measurements of an object at interstellar distances were undertaken by German Astronomer Friedrich Wilhelm Bessel in 1838 In Astronomy, stellar classification is a classification of Stars based initially on photospheric temperature and its associated Spectral characteristics A star catalogue, or star catalog, is an Astronomical catalogue that lists Stars In Astronomy, many stars are referred to simply by catalogue A star is a massive luminous ball of plasma. The nearest star to Earth is the Sun, which is the source of most of the Energy on Earth In common usage a constellation is a group of celestial bodies that are connected together in some arrangement typically stars to form a visible figure or picture Cassiopeia ( colloquially /ˌkæsiˈoʊpiə/ is a northern Constellation which Greek mythology considered to represent the vain queen Cassiopeia who boasted Based on its absolute magnitude of 3. In Astronomy, absolute magnitude (also known as absolute visual magnitude) is the Apparent magnitude an object would have if it were at a standard 70 and spectral type of G0, it is a subgiant star, meaning this star hotter than our Sun has nearly exhausted the hydrogen supply in its core. In Astronomy, stellar classification is a classification of Stars based initially on photospheric temperature and its associated Spectral characteristics Subgiant star is a class of Stars that are slightly brighter than normal Main sequence (dwarf stars of the same spectral class but not as bright as The Sun (Sol is the Star at the center of the Solar System. Hydrogen (ˈhaɪdrədʒən is the Chemical element with Atomic number 1 The core of the Sun is considered to extend from the center to about 0 The apparent magnitude is 8. The apparent magnitude ( m) of a celestial body is a measure of its Brightness as seen by an observer on Earth, normalized to the value 17, which means it is not visible to the naked eye but can be seen with good binoculars. The naked eye is a Figure of speech referring to human Visual perception that is unaided by enhancing equipment such as a Telescope or The Sun to star distance is 255. The Sun (Sol is the Star at the center of the Solar System. The cosmic distance ladder (also known as the Extragalactic Distance Scale) is the succession of methods by which astronomers determine the Distances to celestial 19 ly or 78. A light-year or light year (symbol ly) is a unit of Length, equal to just under ten trillion Kilometres As defined by 24 pc. History The first direct measurements of an object at interstellar distances were undertaken by German Astronomer Friedrich Wilhelm Bessel in 1838
The mass of the star is 20% more massive and 47% larger than our Sun. The Sun (Sol is the Star at the center of the Solar System. Based on the chromospheric observations, it was found that the age is 110 million years older than our local star. The chromosphere (literally "colour sphere" is a thin layer of the Sun 's atmosphere just above the Photosphere, roughly 10000 kilometres deep Based on spectral observations, the star was found to be metal-rich, 74% more metals than Sol. The M acro E xpansion T emplate A ttribute L anguage complements TAL, providing macros which allow the reuse of code across
It is the first star in Cassiopeia around which an orbiting planet was discovered (in 2007). Year 2007 ( MMVII) was a Common year starting on Monday of the Gregorian calendar in the 21st century.
In February 2008, a possible second planet (HD 17156c) was found. PortalCurrent events International holidays February 2 - Candlemas February 5 - Shrove HD 17156 c is a plausible Extrasolar planet approximately 255 Light-years away in the Constellation of Cassiopeia. It was found by anomalies with the inner planet HD 17156b.
| Planet (in order from star) |
Mass (MJ) |
Orbital period (days) |
Semimajor axis (AU) |
Eccentricity |
|---|---|---|---|---|
| b | 3. An extrasolar planet, or exoplanet, is a Planet beyond the Solar System, orbiting around other Stars As of September 2008 312 Mass is a fundamental concept in Physics, roughly corresponding to the Intuitive idea of how much Matter there is in an object Jupiter mass is the unit of Mass equal to one Jupiter (18986 × 1027 kg, 317 The orbital period is the time taken for a given object to make one complete Orbit about another object A day (symbol d is a unit of Time equivalent to 24 Hours and the duration of a single Rotation of planet Earth with respect to the In Geometry, the semi-major axis (also semimajor axis) is used to describe the dimensions of ellipses and hyperbolae The astronomical unit ( AU or au or au or sometimes ua) is a unit of Length based on the distance from the Earth to the 111+0. 035−0. 015 | 21. 21725+0. 00048−0. 00043 | 0. 1594+0. 0012−0. 0041 | 0. 6717+0. 0028−0. 0027 |
| c | 0. HD 17156 c is a plausible Extrasolar planet approximately 255 Light-years away in the Constellation of Cassiopeia. 063 ± 0. 007 | 111. 314 ± 3 | 0. 481 ± 0. 001 | 0. 136 ± 0. 005 |
See also
External links
The following are lists of stars with confirmed Extrasolar planets.Dapyx Software network: MP3 Explorer | Ebook Manager | Zenithic