HD 49674

HD 49674
Observationsdata
Epok: J2000.0
StjärnbildKusken
Rektascension06t 51m 30,514s[1]
Deklination+40° 52′ 03,92″[1]
Skenbar magnitud ()+8,1 (V)[2]
Stjärntyp
SpektraltypG0 V[2]
B–V+0,72[2]
Astrometri
Radialhastighet ()11,91 ± 0,09[2] km/s
Egenrörelse (µ)RA: 32,23 ± 0,97[1] mas/år
Dek.: -122,70 ± 0,69[1] mas/år
Parallax ()22,61 ± 0,87[1]
Avstånd144 ± 6  (44 ± 2 pc)
Absolut magnitud ()4,87[2]
Detaljer
Massa1,07 ± 0,02[3] M
Radie1,01 ± 0,01[3] R
Luminositet0,96 ± 0,01[3] L
Temperatur5 702 ± 28[3] K
Metallicitet0,280 ± 0,02 (Fe/H)[2] dex
Ålder1,8 ± 1,2[3] miljarder år
Andra beteckningar
HD 49674, AG+40 813, BD+41 1544, GSC 02946-00426, HIC 32916, HIP 32916, 2MASS J06513051+4052041, PPM 49392, SAO 41390, TYC 2946-426-1, uvby98 100049674, WDS J06515+4052A, Gaia DR2 951427000863064192, Gaia DR1 951438747596202624 [4]

Nervia eller HD 49674 är en ensam stjärna belägen i den mellersta delen av stjärnbilden Kusken. Den har en skenbar magnitud av ca 8,1[2] och kräver åtminstone en stark handkikare eller ett mindre teleskop för att kunna observeras. Baserat på parallaxmätning inom Hipparcosuppdraget på ca 22,6[1] mas, beräknas den befinna sig på ett avstånd på ca 144 ljusår (ca 44 parsek) från solen. Den rör sig bort från solen med en heliocentrisk radialhastighet på ca 12 km/s.[2]

Nomenklatur

Stjärnan HD 49674 har tilldelats namnet Nervia på förslag av Belgien i NameExoWorlds-kampanjen, under IAU:s 100-årsjubileum. De föreslagna namnen för stjärnan, Nervia, och för den omkretsande planeten, Eburonia, kommer båda från framträdande belgiska germanstammar, nervier respektive eburoner.[5]

Egenskaper

HD 49674 är en gul till vit stjärna i huvudserien av spektralklass G0 V,[2]. Den har en massa, en radie och utstrålning av energi från dess fotosfär nära vad som gäller för solen[3] och har en effektiv temperatur av ca 5 700 K.[3]

Planetsystem

Vid tidpunkten för upptäckten av planeten HD 49674 b år 2002, var det den minst massiva kända exoplaneten, mycket nära gränsen mellan under-Jupiter massa och Neptunus-massa vid 0,1 Jupitermassa. Planeten kretsar mycket nära stjärnan.[6]

HD 49674 solsystem[7]
Planet
Massa
Halv storaxel
(AE)
Siderisk omloppstid
(d)
Excentricitet
Inklination
Radie
b
≥0,105 ± 0,011 MJ
0,0580 ± 0,0034
4,94737 ± 0,00098
0,087 ± 0,095
-
-

Se även

Referenser

Den här artikeln är helt eller delvis baserad på material från engelskspråkiga Wikipedia, HD 49674, 19 augusti 2020.

Noter

  1. ^ [a b c d e f] van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry
  2. ^ [a b c d e f g h i] https://www.universeguide.com/star/32916/nervia. Hämtad 2020-08-19.
  3. ^ [a b c d e f g] Bonfanti, A.; et al. (2015). "Revising the ages of planet-hosting stars". Astronomy and Astrophysics. 575. A18. arXiv:1411.4302. Bibcode:2015A&A...575A..18B. doi:10.1051/0004-6361/201424951.
  4. ^ http://simbad.u-strasbg.fr/simbad/sim-id?Ident=HD+49674. Hämtad 2020-08-19.
  5. ^ "Belgium". NameExoworlds. Hämtad 2019-12-22.
  6. ^ Butler, R. Paul; et al. (2003). "Seven New Keck Planets Orbiting G and K Dwarfs". The Astrophysical Journal. 582 (1): 455–466. Bibcode:2003ApJ...582..455B. CiteSeerX 10.1.1.7.6988. doi:10.1086/344570.
  7. ^ Butler, R. P.; et al. (2006). "Catalog of Nearby Exoplanets". The Astrophysical Journal. 646 (1): 505–522. arXiv:astro-ph/0607493. Bibcode:2006ApJ...646..505B. doi:10.1086/504701.

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