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WD 0806−661
WD 0806−661 (L 97-3, GJ 3483) is a DQ white dwarf with an extremely cold Y-type substellar companion (designated "B"), located in the constellation Volans at 63 light-years from Earth. The companion was discovered in 2011, and is the only known Y-type companion to a star or stellar remnant. At the time of its discovery WD 0806-661 B had the largest actual (2500 AU) and apparent separation (more than 2 arcminutes) of any known planetary-mass object, as well as being the coldest directly imaged substellar object then known. WD 0806-661 B Component WD 0806-661 B was discovered in 2011 with the Spitzer Space Telescope. Its discovery paper is ''Luhman et al., 2011''. The secondary has a mass between 7 and 9 and a temperature between 325–350 Kelvin (52-77 °C; 125-170 °F). At the time of its discovery, WD 0806−661 B was the coldest "brown dwarf" that has ever been found. The object is too faint to acquire a spectrum even with the Hubble Space Telescope, however th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
WD 0806-661 AB
WD may refer to: Arts and entertainment * ''The Walking Dead'' (TV series) * ''White Dwarf'' (magazine) Businesses and organizations Government agencies * Royal Canadian Air Force Women's Division * War Department (United Kingdom) Other businesses and organizations * DAS Air Cargo (IATA code WD) * Wardair (defunct IATA code WD) * WD-40 Company, manufacturer of household and multi-use products, well known for its signature brand, WD-40. * Western Digital, a computer storage manufacturer * Western Economic Diversification Canada, a Canadian government agency * Wikidata, a Wikimedia Foundation collaborative online project * Wilts & Dorset, a southern England bus operator * Winn-Dixie, an American supermarket chain Places * WD postcode area, England, UK * County Waterford, Ireland Science and technology * WD-40, a penetrating oil spray * Band 3, a protein * Web Dynpro, a web application for developing business applications * Whipple's disease, a rare, systemic infe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Light-year
A light-year, alternatively spelled light year, is a large unit of length used to express astronomical distance, astronomical distances and is equivalent to about 9.46 Orders of magnitude (numbers)#1012, trillion kilometers (), or 5.88 trillion miles ().One trillion here is long and short scales, taken to be 1012 (one million million, or billion in long scale). As defined by the International Astronomical Union (IAU), a light-year is the distance that Speed of light, light travels in a vacuum in one Julian year (astronomy), Julian year (365.25 days). Because it includes the time-measurement word "year", the term ''light-year'' is sometimes misinterpreted as a unit of time. The ''light-year'' is most often used when expressing distances to stars and other distances on a Galaxy, galactic scale, especially in public understanding of science, non-specialist contexts and popular science publications. The unit most commonly used in professional astronomy is the parsec (symbol ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
HD 106906 B
HD 106906 b is a directly imaged planetary-mass companion and candidate exoplanet orbiting the star , in the constellation Crux at about from Earth. It is estimated to be about eleven times the mass of Jupiter and is located about 738 AU away from its host star. is rare in astronomy; while its mass estimate is nominally consistent with identifying it as an exoplanet, it appears at a much wider separation from its parent star than thought possible for in-situ formation from a protoplanetary disk. Description is the only known companion orbiting , a spectroscopic binary star composed of two F5V main-sequence stars with a combined mass of . Based on the star's luminosity and temperature, the system is estimated to be about . The system is a likely member of the Scorpius–Centaurus association. The star is surrounded by a debris disk oriented 21 degrees away from ; this disk is about from the binary on its interior and ranges asymmetrically from approximately from th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
DT Virginis
DT Virginis, also known as Ross 458, is a binary star system in the constellation of Virgo. It has an apparent visual magnitude of 9.79 and is located at a distance of 37.6 light-years from the Sun. Both of the stars are low-mass red dwarfs with at least one of them being a flare star. This binary system has a circumbinary sub-stellar companion. This star was mentioned as a suspected variable by M. Petit in 1957. In 1960, O. J. Eggen classified it as a member of the Hyades moving group based on the system's space motion; it is now considered a likely member of the Carina Near Moving Group. Two flares were reported from this star in 1969 by N. I. Shakhovskaya, confirming it as a flare star. It was identified as an astrometric binary in 1994 by W. D. Heintz, who found a period of 14.5 years. The pair were resolved using adaptive optics in 1999. Early mass estimates placed the companion near the substellar limit, and it was initially proposed as a brown ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
WISE 1217+1626 B
WISEPC J121756.91+162640.2 (designation abbreviated to WISE 1217+1626, or WISE J1217+1626) is a binary brown dwarf system of spectral classes T9 + Y0, located in constellation Coma Berenices at approximately 30.4 light-years from Earth. History of observations Discovery WISE 1217+1626 A was discovered in 2011 by J. Davy Kirkpatrick ''et al.'' from data, collected by Wide-field Infrared Survey Explorer (WISE) Earth-orbiting satellite — NASA infrared-wavelength 40 cm (16 in) space telescope, which mission lasted from December 2009 to February 2011. In 2011 Kirkpatrick ''et al.'' published a paper in '' The Astrophysical Journal Supplement'', where they presented discovery of 98 new found by WISE brown dwarf systems with components of spectral types M, L, T and Y, among which also was WISE 1217+1626.These 98 brown dwarf systems are only among first, not all brown dwarf systems, discovered from data, collected by WISE: six discoveries were published earlier (however ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
WISE 0146+4234
WISE J014656.66+423410.0 (designation abbreviated to WISE 0146+4234) is a binary brown dwarf of spectral classes T9 and Y0 located in the constellation Andromeda (constellation), Andromeda. It is approximately 60 light-years from Earth. Discovery WISE 0146+4234 was discovered in 2012 by J. Davy Kirkpatrick et al. from data, collected by Wide-field Infrared Survey Explorer, Wide-field Infrared Survey Explorer (WISE) Earth-orbiting satellite — National Aeronautics and Space Administration, NASA infrared, infrared-wavelength 40 centimeter, cm (16 inch, in) space observatory, space telescope, which mission lasted from December 2009 to February 2011. In 2012 Kirkpatrick et al. published a paper in The Astrophysical Journal, where they presented discovery of seven new found by WISE brown dwarfs of spectral type Y, among which also was WISE 0146+4234. Distance The distance of WISE 0146+4234 was initially estimated to be 20 light-years from earth. Later measurements of its stel ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
