- NGC 884
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NGC 884 
The Double Cluster, NGC 869 (right) and NGC 884 (left) with north to the topObservation data (J2000 epoch) Constellation Perseus Right ascension 02h 22.0m[1] Declination +57° 08′[1] Distance 7.6 kly[2] (2.3 kpc[2]) Apparent magnitude (V) 6.1[1] Apparent dimensions (V) 30′ Physical characteristics Mass - M☉ Radius - Estimated age 12.5 My [2] Notable features - Other designations Collinder 25,[1] Melotte 14,[1]
Chi Per Cluster,[1] χ Persei[1]
Raab 10,[1] OCl 353,[1]See also: Open cluster, List of open clusters NGC 884 is an open cluster located 7600 light years[2] away in the constellation of Perseus. The cluster is most likely around 12.5[2] million years old. It is the easternmost of the Double Cluster with NGC 869. Located in the Perseus OB1 association both clusters are located physically close to one another, only a few hundred light years apart. The clusters were first recorded by Hipparchus, but have likely been known since antiquity.
The Double Cluster is a favorite of amateur astronomers. These bright clusters are often photographed or observed with small telescopes. Easy to find, the clusters are visible with the unaided eye between the constellations of Perseus and Cassiopeia as a brighter patch in the winter Milky Way.
In small telescopes the cluster appears as a beautiful assemblage of bright stars located in a rich star field. Dominated by bright blue stars the cluster also hosts a few orange stars that add to the visual interest. Both clusters together offer a spectacular low magnification view.
Sometimes known as χ Per this designation more probably refers to both clusters[3].
External links
References
- ^ a b c d e f g h i "SIMBAD Astronomical Database". Results for NGC 884. http://simbad.u-strasbg.fr/Simbad. Retrieved 2006-12-22.
- ^ a b c d e Kharchenko et al. (2005). "Astrophysical Parameters of Galactic Open Clusters". Astronomy and Astrophysics 438 (3): 1163–1173. arXiv:astro-ph/0501674. Bibcode 2005A&A...438.1163K. doi:10.1051/0004-6361:20042523. http://www.aanda.org/articles/aa/full/2005/30/aa2523-04/aa2523-04.html.
- ^ Stephen James O'Meara and Daniel W.E. Green, 2003, "The Mystery of the Double Cluster", Sky and Telescope,Vol. 105, No. 2, p. 116-119 (February 2003)
Bayer α (Mirfak / Algenib) • β (Algol) • γ • δ • ε • ζ • η (Miram) • θ • ι • κ (Misam) • λ • μ • ν • ξ (Menkib) • ο (Atik) • π (Gorgonea Secunda) • ρ (Gorgonea Tertia) • σ • τ • φ • χ (also NGC 884) • ψ • ω (Gorgonea Quarta) • b • c • d • e • f • g • i • k • l • m • n • o • AFlamsteed 1 • 2 • 3 • 4 (g) • 5 • 7 (χ) • 8 • 9 (i) • 10 • 11 • 12 • 13 (θ) • 14 • 15 (η, Miram) • 16 • 17 • 18 (τ) • 20 • 21 • 22 (π, Gorgonea Secunda) • 23 (γ) • 24 • 25 (ρ, Gorgonea Tertia) • 26 (β, Algol) • 27 (κ, Misam) • 28 (ω, Gorgonea Quarta) • 29 • 30 • 31 • 32 (l) • 33 (α, Mirfak / Algenib) • 34 • 35 (σ) • 36 • 37 (ψ) • 38 (ο, Atik) • 39 (δ) • 40 (o) • 41 (ν) • 42 (n) • 43 (A) • 44 (ζ) • 45 (ε) • 46 (ξ, Menkib) • 47 (λ) • 48 (c) • 49 • 50 • 51 (μ) • 52 (f) • 53 (d) • 54 • 55 • 56 • 57 (m) • 58 (e) • 59 • 1 AurNearby GJ 1068Other Categories:- Open clusters
- Perseus constellation
- NGC objects
- Bayer objects
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