18 Pegasi

18 de Pégase

Cet article est une ébauche concernant une étoile.

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18 Pegasi

Données d'observation
(époque J2000.0)
Ascension droite	22^h 00^m 07,9275^s^[1]
Déclinaison	+06° 43′ 02,812″^[1]
Constellation	Pégase
Magnitude apparente	6,00^[2]
Localisation dans la constellation : Pégase

Caractéristiques
Type spectral	B3III^[3]
Indice U-B	−0,57^[2]
Indice B-V	−0,12^[2]
Variabilité	SPB^[3]

Astrométrie
Vitesse radiale	−7,4 ± 1,6 km/s^[4]
Mouvement propre	μ_α = +13,849 mas/a^[1] μ_δ = +0,399 mas/a^[1]
Parallaxe	2,168 0 ± 0,082 1 mas^[1]
Distance	461,254 6 ± 17,467 3 pc (∼1 500 al)^[1]

Désignations

18 Peg, HR 8385, HD 209008, HIP 108612, BD+06°4940, FK5 3759, SAO 127219^[5]

18 Pegasi, en français 18 de Pégase, est une étoile binaire brillante (magnitude visuelle 6, visible à l'œil nu) de la constellation de Pégase, située à relativement haute latitude galactique (l = 65,80° , b = -36,51°)^[3]. D'après la mesure de sa parallaxe par le satellite Gaia, elle est distante de près de ∼ 1 500 a.l. (∼ 460 pc) de la Terre^[1].

18 Pegasi est une étoile binaire spectroscopique à raies simples. Son étoile primaire est une géante bleue de type spectral B3III. Elle appartient à la classe des étoiles de type B à pulsation lente^[3].

Références

↑ ^{a b c d e f et g} (en) A. G. A. Brown et al. (Gaia collaboration), « Gaia Data Release 2 : Summary of the contents and survey properties », Astronomy & Astrophysics, vol. 616,‎ août 2018, article n^o A1 (DOI 10.1051/0004-6361/201833051, Bibcode 2018A&A...616A...1G, arXiv 1804.09365). Notice Gaia DR2 pour cette source sur VizieR.
↑ ^{a b et c} (en) D. Hoffleit et W. H. Warren, « Bright Star Catalogue, 5^e éd. », Catalogue de données en ligne VizieR : V/50. Publié à l'origine dans : 1964BS....C......0H, vol. 5050,‎ 1995 (Bibcode 1995yCat.5050....0H)
↑ ^{a b c et d} (en) A. Irrgang, A. Desphande, S. Moehler, M. Mugrauer, et D. Janousch, « The slowly pulsating B-star 18 Peg: A testbed for upper main sequence stellar evolution » [« L'étoile B à pulsations lentes 18 Peg : Un banc d'essai pour l'évolution stellaire de la séquence principale supérieure »], Astronomy & Astrophysics, vol. 591,‎ juin 2016, p. 14, article n^o L6 (DOI 10.1051/0004-6361/201628844, Bibcode 2016A&A...591L...6I, arXiv 1605.09267, lire en ligne)
↑ (en) G. A. Gontcharov, « Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system », Astronomy Letters, vol. 32, n^o 11,‎ novembre 2006, p. 759 (DOI 10.1134/S1063773706110065, Bibcode 2006AstL...32..759G, arXiv 1606.08053)
↑ (en) * 18 Peg -- Star sur la base de données Simbad du Centre de données astronomiques de Strasbourg.

Lien externe

(en) 18 Pegasi sur la base de données Simbad du Centre de données astronomiques de Strasbourg.

v · m Étoiles de la constellation de Pégase
Bayer	α (Markab) β (Schéat) γ (Algenib) ε (Enif) ζ (Homam) η (Matar) θ (Biham) ι κ λ μ (Sadalbari) ν (en) ξ ο (en) π¹ (en) π² (en) ρ (en) σ (en) τ (Salm) υ (Alkarab) φ (en) χ (en) ψ (en)
Flamsteed	1 2 (en) 3 4 5 7 9 (en) 11 12 13 14 15 16 17 18 19 20 21 23 25 28 30 31 (en) 32 (en) 33 (en) 34 (en) 35 (en) 36 37 38 39 40 41 45 51 (Helvetios) 52 55 (en) 56 (en) 57 58 59 60 61 63 64 65 66 67 69 70 (en) 71 72 (en) 73 74 75 76 77 78 (en) 79 80 82 83 85 (en) 86 87 23 Psc 34 Vul
Étoiles variables	R S (en) U W Z RU RZ SV AG (en) AT AV AW BB BX DH DI DY EE (en) EQ (en) GT GX HN (en) HO HP HR II (en) IK IM (en) IP KT KU LL LO MT (en) NV NZ OY PT V343 V354 V363 V372 V391
HR	8116 8219 8257 8258 8274 8292 8348 8358 8364 8372 (en) 8397 8415 8435 8455 8456 8458 8461 (en) 8466 8475 8482 8514 8564 8631 8642 8737 8788 8792 8799 (V342) 8824 8833 8838 8942 8970 9039 9055 9109
HD	434 205011 208897 209458 (V376) 214823 215733 219828 (en) 220197 220773 (en) 221170 225292
WASP	10 (en) 21 (Tangra) (en) 52 (Anadolu) 59 60 (Morava) 102 114 134 J230808.34+333803.9
Autres	BD+14 4559 (Solaris) (en) BD +17 4708 BD +28 4211 GD 246 Gliese 829 (en) Gliese 880 (en) HAT-P-8 (en) HIP 109600 NGC 8 NGC 18 NGC 30 PG 2131+066 PSR B2127+11 C PSR B2303+30
Liste d'étoiles de Pégase

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