Kinematic study of 4003 open star clusters yields galactic rotation rates Ω0=28.99 km/s/kpc and |ΔΩ|=2.0 km/s/kpc, indicating the Sun lies close to corotation at 7.6 or 8.6 kpc.
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Gaia DR2 OB star data yield Ω₀=29.70±0.11 km s⁻¹ kpc⁻¹, Ω'₀=-4.035±0.031 km s⁻¹ kpc⁻², Ω''₀=0.620±0.014 km s⁻¹ kpc⁻³, V₀=238±5 km s⁻¹ at R₀=8.0 kpc, plus spiral wave amplitudes f_θ=4.4±1.4 km s⁻¹, f_R=5.1±1.2 km s⁻¹ and wavelengths ~2 kpc.
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Analysis of spatial velocities of several samples of open star clusters
Kinematic study of 4003 open star clusters yields galactic rotation rates Ω0=28.99 km/s/kpc and |ΔΩ|=2.0 km/s/kpc, indicating the Sun lies close to corotation at 7.6 or 8.6 kpc.
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Galactic Rotation Based on OB Stars from the Gaia DR2 Catalogue
Gaia DR2 OB star data yield Ω₀=29.70±0.11 km s⁻¹ kpc⁻¹, Ω'₀=-4.035±0.031 km s⁻¹ kpc⁻², Ω''₀=0.620±0.014 km s⁻¹ kpc⁻³, V₀=238±5 km s⁻¹ at R₀=8.0 kpc, plus spiral wave amplitudes f_θ=4.4±1.4 km s⁻¹, f_R=5.1±1.2 km s⁻¹ and wavelengths ~2 kpc.