HD 139357

HD 139357
Observationsdata
Epok: J2000.0
StjärnbildDraken
Rektascension13t 35m 16,19846 s[1]
Deklination+53° 55′ 19,7147 ″[1]
Skenbar magnitud ()+5,97 (V)[2]
Stjärntyp
SpektraltypK4 III[3]
B–V+1,184 ± 0,006[2]
Astrometri
Radialhastighet ()+8,04 ± 0,14[1] km/s
Egenrörelse (µ)RA: -18,767[1] mas/år
Dek.: +1,760[1] mas/år
Parallax ()8,8930 ± 0,0551[1]
Avstånd367 ± 2 lå (112,4 ± 0,7 pc)
Absolut magnitud ()+3,18[2]
Detaljer
Massa1,1 ± 0,1[4]
1,35 ± 0,24[5]
2,16 ± 0,18[3] M☉
Radie11,47 ± 0,75[5]
14,4 ± 0,4[3] R☉
Luminositet74 ± 1[4] L☉
Temperatur4 601 ± 28[6] K
Metallicitet-0,13 ± 0,05 (Fe/H) [5] dex
0,34 ± 0,05 (Fe/H) [3] dex
Ålder1,19 ± 0,33[5] miljarder
3,07 ± 1,47[5] miljarder
7,20 ± 1,80[5] miljarder år
Andra beteckningar
AG+54 1007, BD+54 1756, GSC 03869-00494, HIC 76311, HIP 76311, HR 5811, IRAS 15339+5405, 2MASS J15351620+5355195, PPM 35043, SAO 29583, TYC 3869-494-1, Gaia DR2 1597757387783227008 [7][8]

HD 139357 är en ensam stjärna i den södra delen av stjärnbilden Draken. Den har en skenbar magnitud av ca 5,97[2] och är mycket svagt synlig för blotta ögat där ljusföroreningar ej förekommer. Baserat på parallax enligt Gaia Data Release 2 på ca 8,9[1] mas, beräknas den befinna sig på ett avstånd på ca 367 ljusår (ca 112 parsek) från solen. Den rör sig bort från solen med en heliocentrisk radialhastighet på ca -8 km/s.[1]

Egenskaper

HD 139357 är en orange till gul jättestjärna av spektralklass K4 III[3] och är extremt ung för att vara en jätte.[3] Den har, mest troligt, en massa som är ca 1,4[5] solmassor, en radie som är ca 11,5[5] solradier och har ca 74 gånger solens utstrålning av energi[4] från dess fotosfär vid en effektiv temperatur av ca 4 600 K.[6]

Planetsystem

År 2009 upptäcktes en exoplanet, HD 139357 b, i omlopp kring stjärnan.[5]

HD 139357 solsystem[5]
Planet
Massa
Halv storaxel
(AE)
Siderisk omloppstid
(d)
Excentricitet
Inklination
Radie
b
≥ 9,76 ± 2,15 MJ
2,36 ± 0,02
1125,7 ± 9
0,10 ± 0,02
-
-

Se även

Referenser

Den här artikeln är helt eller delvis baserad på material från engelskspråkiga Wikipedia, HD 139357, 26 juni 2021.

Noter

  1. ^ [a b c d e f g h] Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. ^ [a b c d] Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644.
  3. ^ [a b c d e f] Maldonado, J.; et al. (April 2019). "Connecting substellar and stellar formation: the role of the host star's metallicity". Astronomy & Astrophysics. 624: 7. arXiv:1903.01141. Bibcode:2019A&A...624A..94M. doi:10.1051/0004-6361/201833827. S2CID 118934484. A94.
  4. ^ [a b c] Bonfanti, A.; Ortolani, S.; Nascimbeni, V. (2016). "Age consistency between exoplanet hosts and field stars". Astronomy & Astrophysics. 585: 14. arXiv:1511.01744. Bibcode:2016A&A...585A...5B. doi:10.1051/0004-6361/201527297. S2CID 53971692. A5.
  5. ^ [a b c d e f g h i j] Döllinger, M. P.; et al. (2009). "Planetary companion candidates around the K giant stars 42 Draconis and HD 139 357". Astronomy and Astrophysics. 499 (3): 935–942. arXiv:0903.3593. Bibcode:2009A&A...499..935D. doi:10.1051/0004-6361/200810837. S2CID 15677079.
  6. ^ [a b] Maldonado, J.; Villaver, E. (April 2016). "Evolved stars and the origin of abundance trends in planet hosts". Astronomy & Astrophysics. 588: 11. arXiv:1602.00835. Bibcode:2016A&A...588A..98M. doi:10.1051/0004-6361/201527883. S2CID 119212009. A98.
  7. ^ HD 139357 (u-strasbg.fr) |Hämtad 2021-12-29.
  8. ^ "HD 139357". SIMBAD. Centre de données astronomiques de Strasbourg. Hämtad 2021-01-11.

Externa länkar

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Stjärnor i Draken
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