HD 221148

HD 221148
Observationsdata
Epok: J2000.0
StjärnbildVattumannen
Rektascension23t 29m 32,08207 s[1]
Deklination-04° 31′ 57,8915 ″[1]
Skenbar magnitud ()+6,26 (V)[2]
Stjärntyp
SpektraltypK3 IIIv[3]
U–B+1,20[2]
B–V+1,10[2]
VariabeltypMisstänkt
Astrometri
Radialhastighet ()-26,53 ± 1,94[3] km/s
Egenrörelse (µ)RA: +181,03[1] mas/år
Dek.: -232,23[1] mas/år
Parallax ()21,14 ± 0,56[1]
Avstånd154 ± 4 lå (47 ± 1 pc)
Absolut magnitud ()2,89[4]
Detaljer
Radie5[3] R☉
Luminositet8,9[3] L☉
Temperatur4 592[3] K
Metallicitet+0,11 (Fe/H)[3] dex
Vinkelhastighet2,2[3] km/s
Andra beteckningar
BD-05 5999, FK5 3881, HD 221148, HIC 115953, HIP 115953, HR 8924, IRAS 23269-0448, 2MASS J23293207-0431575, NLTT 57022, NSV 14588, PLX 5688, PPM 207611, SAO 146736, TYC 5247-1100-1, uvby98 100221148, WISEA J232932.20-043200.2, Gaia DR2 2633314341181013376, Gaia DR1 2633314336885651072 [5]

HD 221148 är en ensam stjärna belägen i den norra delen av stjärnbilden Vattumannen. Den har en skenbar magnitud av ca 6,26[2] och är mycket svagt synlig för blotta ögat där ljusföroreningar ej förekommer. Baserat på parallaxmätning inom Hipparcosuppdraget på ca 26,5[3] mas, beräknas den befinna sig på ett avstånd på ca 154 ljusår (ca 47 parsek) från solen. Den rör sig närmare solen med en heliocentrisk radialhastighet på ca -27 km/s.[3]

Egenskaper

HD 221148 är en orange till gul jättestjärna av spektralklass K3 IIIv.[3] Den har en radie som är ca 5[3] solradier och har ca 9 gånger solens utstrålning av energi[3] från dess fotosfär vid en effektiv temperatur av ca 4 600 K.[3]

HD 221148 är en misstänkt variabel stjärna. Dess spektrum visar extremt hög nivå av CN, ett av de högsta cyanogenindexen som uppmätts.[6]

Referenser

Den här artikeln är helt eller delvis baserad på material från engelskspråkiga Wikipedia, HD 221148, 20 maj 2021..

Noter

  1. ^ [a b c d e] 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.
  2. ^ [a b c d] Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data. SIMBAD, Bibcode:1986EgUBV........0M
  3. ^ [a b c d e f g h i j k l m] Massarotti, Alessandro; et al. (January 2008), "Rotational and radial velocities for a sample of 761 HIPPARCOS giants and the role of binarity", The Astronomical Journal, 135 (1): 209–231, Bibcode:2008AJ....135..209M, doi:10.1088/0004-6256/135/1/209
  4. ^ https://www.universeguide.com/star/115953/hd221148. Hämtad 2021-05-23.
  5. ^ HD 221148 (u-strasbg.fr) |Hämtad 2021-05-23
  6. ^ Janes, K. A. (May 1975), "Cyanogen Strengths, Luminosities, and Kinematics of K Giant Stars", Astrophysical Journal Supplement, 29: 161–183, Bibcode:1975ApJS...29..161J, doi:10.1086/190339. See p. 179.

Externa länkar

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