| Extrasolar planet | List of extrasolar planets | |
|---|---|---|
| Parent star | ||
| Star | HD 17156 | |
| Constellation | Cassiopeia | |
| Right ascension | (α) | 02h 49m 44. An extrasolar planet, or exoplanet, is a Planet beyond the Solar System, orbiting around other Stars As of September 2008 312 The following are lists of stars with confirmed Extrasolar planets. 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 HD 17156 is a Yellow subgiant Star approximately 255 Light-years away in the Constellation of Cassiopeia. 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 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 | (δ) | +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″ |
| 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 | |
| Orbital elements | ||
| Semimajor axis | (a) | 0. 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 The elements of an orbit are the parameters needed to specify that Orbit uniquely given a model of two point-masses obeying the Newtonian laws of motion and the In Geometry, the semi-major axis (also semimajor axis) is used to describe the dimensions of ellipses and hyperbolae 1594+0. 0012-0. 0041[1] AU |
| Eccentricity | (e) | 0. 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 In Astrodynamics, under standard assumptions, any Orbit must be of Conic section shape 6717+0. 0028-0. 0027[1] |
| Orbital period | (P) | 21. The orbital period is the time taken for a given object to make one complete Orbit about another object 21725+0. 00048-0. 00043[1] d |
| Inclination | (i) | 88. 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 Inclination in general is the Angle between a Reference plane and another plane or axis of direction 23+0. 017-0. 05[1]° |
| Angular distance | (θ) | 2. In Mathematics (in particular Geometry and Trigonometry) and all Natural sciences (including astronomy geophysics etc the angular distance 037 mas |
| Longitude of periastron |
(ω) | 121. A minute of arc, arcminute, or MOA is a unit of angular measurement, equal to one sixtieth (1/60 of one degree. In Astrodynamics, the longitude of the periapsis (symbolized \varpi of an orbiting body is the Longitude (measured from the point of the vernal equinox In Celestial mechanics, an apsis, plural apsides (ˈæpsɨdɪːz is the point of greatest or least distance of the Elliptical orbit of an object from 23+0. 42-0. 38[1]° |
| Time of periastron | (T0) | 2454438. In Celestial mechanics, an apsis, plural apsides (ˈæpsɨdɪːz is the point of greatest or least distance of the Elliptical orbit of an object from 4835±0. 0025[1] JD |
| Semi-amplitude | (K) | 132. The Julian date (JD is the interval of time in days and fractions of a day since 4713 B Amplitude is the magnitude of change in the oscillating variable with each Oscillation, within an oscillating system 5 ± 9. 5 m/s |
| Physical characteristics | ||
| Mass | (m) | 3. Mass is a fundamental concept in Physics, roughly corresponding to the Intuitive idea of how much Matter there is in an object 111+0. 035-0. 015[1] MJ |
| Radius | (r) | 0. Jupiter mass is the unit of Mass equal to one Jupiter (18986 × 1027 kg, 317 Remote Authentication Dial In User Service ( RADIUS) is a networking protocol that provides centralized access authorization and accounting management for people or computers 964+0. 016-0. 027[1] RJ |
| Density | (ρ) | 3470+350-180[1] kg/m3 |
| Surface gravity | (g) | 8. The density of a material is defined as its Mass per unit Volume: \rho = \frac{m}{V} Different materials usually have different CM3 redirects here If you were looking for the 3rd game in the Cooking Mama series abbreviated as CM3 see here. The surface gravity, g, of an astronomical or other object is the Gravitational acceleration experienced at its surface 52 m/s² |
| Temperature | (T) | 800-850 K |
| Discovery information | ||
| Discovery date | April 14, 2007 | |
| Discoverer(s) | Fischer et al. Temperature is a physical property of a system that underlies the common notions of hot and cold something that is hotter generally has the greater temperature The kelvin (symbol K) is a unit increment of Temperature and is one of the seven SI base units The Kelvin scale is a thermodynamic Events 43 BC - Battle of Forum Gallorum: Mark Antony, besieging Julius Caesar 's assassin Decimus Junius Brutus in Year 2007 ( MMVII) was a Common year starting on Monday of the Gregorian calendar in the 21st century. Debra Fischer is a professor of Astronomy at San Francisco State University. | |
| Detection method | Radial velocity & transit |
|
| Discovery site | Hawaii, USA | |
| Discovery status | Published | |
HD 17156b is an exoplanet orbiting the star HD 17156. An extrasolar planet, or exoplanet, is a Planet beyond the Solar System, orbiting around other Stars As of September 2008 312 It is a superjovian planet slightly smaller than Jupiter but slightly larger than Saturn in a so-called "torched orbit". This highly-eccentric three-week orbit takes it approximately 0. 0523 AU of the star at periastron before swinging out to approximately 0. 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 In Celestial mechanics, an apsis, plural apsides (ˈæpsɨdɪːz is the point of greatest or least distance of the Elliptical orbit of an object from 2665 AU at apastron. In Celestial mechanics, an apsis, plural apsides (ˈæpsɨdɪːz is the point of greatest or least distance of the Elliptical orbit of an object from Its eccentricity is about the same as 16 Cygni Bb, a so-called "eccentric Jupiter". An Eccentric Jupiter is a Jovian planet that orbits its Star in a highly eccentric orbit much like a Comet.
The planet was discovered on April 14, 2007 by a team using the radial velocity method on the Keck and Subaru telescopes. Doppler spectroscopy, also known as Radial velocity measurement is a spectroscopic method for finding Extrasolar planets It involves the observation The W M Keck Observatory is a two-telescope Astronomical observatory at the 4145 meter (13600 ft summit of Mauna Kea in Hawai'i. Subaru Telescope (In Japanese: すばる望遠鏡 is the 82 Metre flagship telescope of the National Astronomical Observatory of Japan, located in [2] The team made an initial, negative, transit search, but they were only able to cover 25% of the search space. This left the possibility of a transit open.
After the possibility of a transit was discussed on oklo.org, various groups performed a follow-on search. These searches confirmed a three-hour transit on October 2, 2007 and a paper was published two days later. Events 1187 - Siege of Jerusalem: Saladin captures Jerusalem after 88 years of Crusader rule [3]
HD 17156b is now the transiting planet with the longest orbital period. Follow-up investigations should reveal more precise orbital elements (as it did on Dec 13, 2007[1]), information on tidal forces and weather on the planet, and whether it is a good candidate for observation by the Spitzer Space Telescope. The Spitzer Space Telescope (formerly the Space Infrared Telescope Facility, SIRTF) is an Infrared Space observatory.
References
- ^ a b c d e f g h i j Gillon, M. et al. (2007). "Improved parameters for the transiting planet HD 17156b: a high-density giant planet with a very eccentric orbit" arxiv:0712. 2073 [astro-ph]. Retrieved on 2007-12-15. Year 2007 ( MMVII) was a Common year starting on Monday of the Gregorian calendar in the 21st century. Events 533 - Byzantine general Belisarius defeats the Vandals, commanded by King Gelimer, at the Battle of
- ^ Debra A. Fischer, Geoffrey W. Marcy, R. Paul Butler, Bun'ei Sato, Steven S. Vogt, Sarah Robinson, Gregory Laughlin, Gregory W. Henry, Shigeru Ida, Eri Toyota, Masashi Omiya, Peter Driscoll, Genya Takeda, Jason T. Wright, John A. Johnson (2007). "Five Intermediate-Period Planets from the N2K Sample".
- ^ M. Barbieri, R. Alonso, G. Laughlin, J. M. Almenara, R. Bissinger, D. Davies, D. Gasparri, E. Guido, C. Lopresti, F. Manzini, and G. Sostero (Oct 4, 2007). "HD 17156b: A Transiting Planet with a 21.2 Day Period and an Eccentric Orbit" 6.
External links
- Notes for planet HD 17156 b
- ArXiv : Parameters and Predictions for the Long-Period Transiting Planet HD 17156b Authors: Jonathan Irwin, David Charbonneau, Philip Nutzman, William F. Welsh, Abhijith Rajan, Marton Hidas, Timothy M. Brown, Timothy A. Lister, Donald Davies, Gregory Laughlin, Jonathan Langton
Dapyx Software network: MP3 Explorer | Ebook Manager | Zenithic