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Balmer line profiles and oxygen line strengths indicate the size and luminosity of Canopus. [49] When the effects of stellar rotation speed on spectral lines are accounted for, the MK spectral class of Canopus is adjusted to A9II. [4] Its spectrum consists mostly of absorption lines on a visible continuum, but some emission has been detected.
A near-infrared image of the R136 cluster. This cluster contains many of the most luminous known stars, including R136a1.Credit: ESO/VLT. This is a list of stars arranged by their absolute magnitude – their intrinsic stellar luminosity.
Occasionally, letters a and b are applied to luminosity classes other than supergiants; for example, a giant star slightly less luminous than typical may be given a luminosity class of IIIb, while a luminosity class IIIa indicates a star slightly brighter than a typical giant. [32]
Canopus (α Carinae) 73.3 [96] AD Second brightest star in the night sky. Gacrux (γ Crucis) 73 [97] L/T eff: Twenty-sixth brightest star in the night sky. Polaris (α Ursae Minoris) 46.27 ± 0.42 [98] AD The current star in the North Pole. It is a Classical Cepheid variable, and the brightest example of its class. Aldebaran (α Tauri) 45.1 ± ...
In photometry, luminous intensity is a measure of the wavelength-weighted power emitted by a light source in a particular direction per unit solid angle, based on the luminosity function, a standardized model of the sensitivity of the human eye. The SI unit of luminous intensity is the candela (cd), an SI base unit.
astro: peak luminosity of the Sun in its thermally-pulsing, late AGB phase (≈5200x present) [69] 4.1 × 10 30 W astro: approximate luminosity of Canopus [70] 10 31: 2.53 × 10 31 W astro: approximate luminosity of the Beta Centauri triple star system [71] 3.3 × 10 31 W astro: approximate luminosity of Betelgeuse, a highly-evolved red ...
HD 95086 b, formally named Levantes, [2] is a confirmed, [5] directly imaged exoplanet orbiting the young, 17 Myr [6] A-class pre-main-sequence star HD 95086.It is roughly 5 times as massive as Jupiter and orbits about 70 AU away from the parent star.
Canopus has persistently been the brightest star over the ages; other stars appear brighter only during relatively temporary periods, during which they are passing the Solar System at a much closer distance than Canopus.