Kappa Andromedae
| |||||||||||||||||||
| κ Andromedae | |||||||||||||||||||
 Położenie gwiazdy oznaczono kółkiem | |||||||||||||||||||
| Dane obserwacyjne (J2000) | |||||||||||||||||||
| Gwiazdozbiór | Andromeda | ||||||||||||||||||
| Rektascensja | 23h 40m 24.508s | ||||||||||||||||||
| Deklinacja | 44° 20′ 02.16″ | ||||||||||||||||||
| Paralaksa (π) | 19,37 ± 0,19[1]″ | ||||||||||||||||||
| Odległość | 168,4 ± 1,6 ly 51,6 ± 0,5 pc | ||||||||||||||||||
| Wielkość obserwowana | +4,14m | ||||||||||||||||||
| Prędkość radialna | -12,70 ± 0,8 km/s | ||||||||||||||||||
| Charakterystyka fizyczna | |||||||||||||||||||
| Typ widmowy | A0 V lub B9 IV | ||||||||||||||||||
| Masa | 2,8 +0,1−0,2 M☉[2] | ||||||||||||||||||
| Promień | 2,29 ± 0,06 R☉ | ||||||||||||||||||
| Metaliczność [Fe/H] | -0,36 ± 0,09 | ||||||||||||||||||
| Wiek | 30 +120−10 Ma lub ~200 Ma | ||||||||||||||||||
| Temperatura | 11 361 ± 66 K | ||||||||||||||||||
| Alternatywne oznaczenia | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| |||||||||||||||||||
Kappa Andromedae (κ And) – gwiazda o typie widmowym A0 V lub B9 IV, położona w gwiazdozbiorze Andromedy, w odległości ok. 168 lat świetlnych od Ziemi. Ma obserwowaną wielkość gwiazdową 4,14m. Jest to biała lub biało-błękitna gwiazda ciągu głównego[1], bądź już podolbrzym[2]. Istnieją różne oceny wieku tej gwiazdy, od bardzo młodego (30 milionów lat) do około 200 milionów lat[2].
Wokół Kappa Andromedae krąży gazowy olbrzym o oznaczeniu Kappa Andromedae b, o promieniu 1,2 +0,2−0,1 promienia Jowisza. Planeta ta została bezpośrednio zaobserwowana i parametry jej orbity nie są dobrze znane[2].
| Towarzysz | Masa (MJ) | Okres orbitalny (dni) | Półoś wielka (au) | Ekscentryczność |
|---|---|---|---|---|
| b | 14,0 +25−2 | ? | 55,0 ± 2,0 | ? |
Zobacz też
- lista gwiazd w gwiazdozbiorze Andromedy
- lista gwiazd posiadających zidentyfikowane planety
- lista najjaśniejszych gwiazd w poszczególnych gwiazdozbiorach
Przypisy
- ↑ a b Kappa Andromedae w bazie SIMBAD (ang.)
- ↑ a b c d Kappa Andromedae w serwisie The Extrasolar Planets Encyclopaedia (ang.)
Media użyte na tej stronie
Kappa Andromeda Star Chart.jpg
This chart locates the star Kappa Andromedae, which is visible to the unaided eye from suburban skies. Kappa And b orbits its star at a projected distance of 55 times Earth's average distance from the sun and about 1.8 times as far as Neptune; the actual distance depends on how the system is oriented to our line of sight, which is not precisely known. The object has a temperature of about 2,600 degrees Fahrenheit (1,400 Celsius) and would appear bright red if seen up close by the human eye. Carson's team detected the object in independent observations at four different infrared wavelengths in January and July of this year. Comparing the two images taken half a year apart showed that Kappa And b exhibits the same motion across the sky as its host star, which proves that the two objects are gravitationally bound and traveling together through space. Comparing the brightness of the super-Jupiter between different wavelengths revealed infrared colors similar to those observed in the handful of other gas giant planets successfully imaged around stars.
This chart locates the star Kappa Andromedae, which is visible to the unaided eye from suburban skies. Kappa And b orbits its star at a projected distance of 55 times Earth's average distance from the sun and about 1.8 times as far as Neptune; the actual distance depends on how the system is oriented to our line of sight, which is not precisely known. The object has a temperature of about 2,600 degrees Fahrenheit (1,400 Celsius) and would appear bright red if seen up close by the human eye. Carson's team detected the object in independent observations at four different infrared wavelengths in January and July of this year. Comparing the two images taken half a year apart showed that Kappa And b exhibits the same motion across the sky as its host star, which proves that the two objects are gravitationally bound and traveling together through space. Comparing the brightness of the super-Jupiter between different wavelengths revealed infrared colors similar to those observed in the handful of other gas giant planets successfully imaged around stars.