HD 240210

Observationsdata Epok: J2000.0
HD 240210

Stjärnbild	Cassiopeja
Rektascension	23^t 10^m 29,22633^s^[1]
Deklination	57° 01′ 46,0277″^[1]
Skenbar magnitud ( $V$ )	+8,33 (V)^[2]
Stjärntyp
Spektraltyp	K3 III^[2]
B–V	1,63
Astrometri
Radialhastighet ( $R_{v}$ )	+8,57 ± 0,05^[1] km/s
Egenrörelse (µ)	RA: 18,492^[1] mas/år Dek.: 6,883^[1] mas/år
Parallax ( $\pi$ )	2,6570 ± 0,0349^[1]
Avstånd	1 230 ± 20 lå (376 ± 5 pc)
Absolut magnitud ( $M_{V}$ )	+0,38^[2]
Detaljer
Massa	1,25 ± 0,25^[3] M_☉
Radie	25,46^+1,16_-0,75^[1] R_☉
Luminositet	152 ± 3^[2] L_☉
Temperatur	4 019⁺⁶⁰_-90^[1] K
Metallicitet	-0,18 ± 0,12 (Fe/H)^[2] dex
Vinkelhastighet	<1,0^[2] km/s
Ålder	3,0^+2,9_-1,5^[4] miljarder år
Andra beteckningar
HD 240210, AG+56 1691, BD+56 2959, GSC 04006-00980, IRAS 23082+5645, 2MASS J23102924+5701460, PPM 41549, SAO 35195, TYC 4006-980-1, Gaia DR2 2009148596857820160 ^[5]

HD 240210 är en ensam stjärna, belägen i den mellersta delen av stjärnbilden Cassiopeja. Den har en skenbar magnitud av ca 8,33^[2] och kräver åtminstone en stark handkikare eller ett mindre teleskop för att kunna observeras. Baserat på parallax enligt Gaia Data Release 2 på ca 2,7^[1] mas, beräknas den befinna sig på ett avstånd på ca 1 230 ljusår (ca 376 parsek) från solen. Den rör sig bort från solen med en heliocentrisk radialhastighet på ca 8,6 km/s.^[1]

Egenskaper

HD 240210 är en orange till gul jättestjärna av spektralklass K3 III.^[2] Den har en massa som är ca 1,3 solmassor,^[2] radie som är lika med ca 25^[1] solradier och har ca 152 gånger solens utstrålning^[1] av energi från dess fotosfär vid en effektiv temperatur på 4 000 K.^[1]

Planetsystem

I juni 2009 upptäckte Niedzielski et al. en planet som kretsar kring HD 240210. Denna exoplanet har en massa som är ≥6,9 Jupitermassor och en omloppsperiod av ca 502 dygn.^[2] Bevis för ytterligare planetariska följeslagare har också hittats.^[3]

Referenser

Den här artikeln är helt eller delvis baserad på material från engelskspråkiga Wikipedia, HD 240210, 31 maj 2020.

Noter

^ [a b c d e f g h i j k l m] 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.
^ [a b c d e f g h i j] Niedzielski, A.; et al. (2009). "Substellar-mass Companions to the K-dwarf BD+14 4559 and the K-giants HD 240210 and BD+20 2457". The Astrophysical Journal. 707 (1): 768–777. arXiv:0906.1804. Bibcode:2009ApJ...707..768N. doi:10.1088/0004-637X/707/1/768.
^ [a b] Adamów, M.; et al. (July 2011). Martin, E.L.; Ge, J.; Lin, W. (eds.). A search for planets around intermediate Mass Stars with the Hobby-Eberly Telescope. Research, Science and Technology of Brown Dwarfs and Exoplanets: Proceedings of an International Conference held in Shangai on Occasion of a Total Eclipse of the Sun, Shangai, China. EPJ Web of Conferences. 16. Bibcode:2011EPJWC..1602005A. doi:10.1051/epjconf/20111602005. 02005.
^ Adamczyk, M.; et al. (2016). "Masses and luminosities for 342 stars from the PennState-Toruń Centre for Astronomy Planet Search". Astronomy and Astrophysics. 587: A119. arXiv:1510.07495. Bibcode:2016A&A...587A.119A. doi:10.1051/0004-6361/201526628.
^ "HD 240210". SIMBAD. Centre de données astronomiques de Strasbourg. Hämtad 2020-05-31.

v • r Stjärnor i Cassiopeja

Bayer	Schedar (α) · Caph (β) · Gamma Cassiopeiae (γ) · Ruchbah (δ) · Segin (ε) · Zeta Cassiopeiae (ζ) · Achird (η) · Marfark (θ) · Jota Cassiopeiae (ι) · Kappa Cassiopeiae (κ) · Lamba Cassiopeiae (λ) · My Cassiopeiae (μ) · Ny Cassiopeiae (ν) · Xi Cassiopeiae (ξ) · Omikron Cassiopeiae (ο) · Pi Cassiopeiae (π) · Rho Cassiopeiae (ρ) · Sigma Cassiopeiae (σ) · Tau Cassiopeiae (τ) · Ypsilon1 Cassiopeiae (υ1) · Ypsilon2 Cassiopeiae (υ2) · Fi Cassiopeiae (φ) · Chi Cassiopeiae (χ) · Psi Cassiopeiae (ψ) · Omega Cassiopeiae (ω)

Flamsteed	1 Cassiopeiae · 2 Cassiopeiae · 4 Cassiopeiae · 6 Cassiopeiae · 9 Cassiopeiae · 10 Cassiopeiae · 12 Cassiopeiae · 13 Cassiopeiae · 16 Cassiopeiae · 23 Cassiopeiae · 31 Cassiopeiae · 32 Cassiopeiae · 35 Cassiopeiae · 38 Cassiopeiae · 40 Cassiopeiae · 42 Cassiopeiae · 43 Cassiopeiae · 44 Cassiopeiae · 47 Cassiopeiae · 48 Cassiopeiae · 49 Cassiopeiae · 50 Cassiopeiae · 51 Cassiopeiae · 52 Cassiopeiae · 53 Cassiopeiae · 54 Cassiopeiae · 55 Cassiopeiae

Variabler	R Cassiopeiae · S Cassiopeiae · T Cassiopeiae · U Cassiopeiae · V Cassiopeiae · W Cassiopeiae · X Cassiopeiae · Y Cassiopeiae · Z Cassiopeiae · AO Cassiopeiae · V547 Cassiopeiae · V705 Cassiopeiae · V987 Cassiopeiae · V1405 Cassiopeiae

HD	HD 3240 · HD 5015 · HD 5550 · HD 6210 · HD 7924 · HD 15558 · HD 15920 · HD 17156 (Nushagak) · HD 19275 · HD 219623 · HD 220074 · HD 240210 · HD 240429 · HD 240430

Övriga	4U 0142+61 · BD+60°2522 · Gliese 48 · Gliese 49 · Gliese 892 · LS I +61 303 · SN 1572 · WR 1 · WR 2 · WR 3

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