Messier 18

Messier 18
Messier 18 on avoin tähtijoukko, jossa on varsin vähän tähtiä.
Messier 18 on avoin tähtijoukko, jossa on varsin vähän tähtiä.
Historia
Löytäjä Charles Messier
Löytöpäivä 3. kesäkuuta 1764
Muut nimet M18, NGC 6613
Ominaisuudet
Tyyppi Avoin tähtijoukko; II,3,p,n
Etäisyys n. 4 900 valovuotta
Massa ?
Koko 9 kaariminuuttia
Ikä n. 32 miljoonaa vuotta
Tähtien lukumäärä 20
Absoluuttinen kirkkaus ?
Havaitseminen
Tähdistö Jousimies
Rektaskensio 18 h 19.9 min
Deklinaatio -17° 08'
Suhteellinen kirkkaus +7.5m

Messier 18 on avoin tähtijoukko Jousimiehen tähdistössä. Sen löysi Charles Messier vuonna 1764.[1] Kohde sijaitsee lähellä Messierin luettelon kohteita M17 ja M24.

Joukko on suhteellisen nuori, vain noin 32 miljoonaa vuotta vanha.

Katso myös

Lähteet

  1. ↑ Frommert, Hartmut & Kronberg, Christine: Messier 18, Open Cluster M18 (NGC 6613), type 'd', in Sagittarius SEDS – Messier Object Index. 21.8.2007. Viitattu 15.3.2021. (englanniksi)

Aiheesta muualla

Jousimiehen tähdistö (Sagittarius) » luettelo tähdistä, luokka
Tähdetε Sgr, σ Sgr, ζ Sgr, δ Sgr, λ Sgr, π Sgr, γ2 Sgr, η Sgr, φ Sgr, τ Sgr, ξ2 Sgr, ο Sgr, μ Sgr, ρ1 Sgr, β1 Sgr, α Sgr, ι Sgr, β2 Sgr, θ1 Sgr, 62 Sgr, υ Sgr, X Sgr, 59 Sgr, 52 Sgr, γ1 Sgr, ω Sgr, 4 Sgr, 21 Sgr, 60 Sgr, ν1 Sgr, ψ Sgr, 56 Sgr, 43 Sgr, 11 Sgr, ν2 Sgr, 61 Sgr, ξ1 Sgr, χ1 Sgr, 55 Sgr, 29 Sgr, 15 Sgr, 54 Sgr, θ2 Sgr, Gl 783, 7 Sgr, 28 Sgr, χ3 Sgr, 14 Sgr, 24 Sgr, 50 Sgr, 18 Sgr, κ1 Sgr, 51 Sgr, κ2 Sgr, 33 Sgr, 63 Sgr, Y Sgr, ρ2 Sgr, 57 Sgr, 9 Sgr, HD 169830, 16 Sgr, RS Sgr, 63 Oph, 26 Sgr, HD 179949, 6 Sgr, 30 Sgr, 53 Sgr, 25 Sgr, 65 Sgr, RY Sgr, 17 Sgr, χ2 Sgr, HD 190647, Ross 154, Pistoolitähti, S2
EksoplaneetatHD 169830 b, HD 169830 c, HD 179949 b, HD 190647 b
Messierin luettelo
M1 | M2 | M3 | M4 | M5 | M6 | M7 | M8 | M9 | M10 | M11 | M12 | M13 | M14 | M15 | M16 | M17 | M18 | M19 | M20 | M21 | M22 | M23 | M24 | M25 | M26 | M27 | M28 | M29 | M30 | M31 | M32 | M33 | M34 | M35 | M36 | M37 | M38 | M39 | M40 | M41 | M42 | M43 | M44 | M45 | M46 | M47 | M48 | M49 | M50 | M51 | M52 | M53 | M54 | M55 | M56 | M57 | M58 | M59 | M60 | M61 | M62 | M63 | M64 | M65 | M66 | M67 | M68 | M69 | M70 | M71 | M72 | M73 | M74 | M75 | M76 | M77 | M78 | M79 | M80 | M81 | M82 | M83 | M84 | M85 | M86 | M87 | M88 | M89 | M90 | M91 | M92 | M93 | M94 | M95 | M96 | M97 | M98 | M99 | M100 | M101 | M102 | M103 | M104 | M105 | M106 | M107 | M108 | M109 | M110
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