When the brightness of Sirius suggests it’s only 362.45 AU distant [instead of the officially mandated 8.6 light years] then it’s worth taking a second look.
A simple proportional calibration of the entire Brightness Relative To Vega proxy curve suggests Sirius is [only] at a distance of 362.45 AU i.e. 0.0057312 light years.
The calibration of the proxy curve generates a very curious coincidence whereby the proxy formula constant of 1394.1 is remarkably close [1.98% difference] to the mainstream Extraterrestrial Solar Radiation constant of 1367 watts per square metre.
A second look reveals a confused cavalcade of colour.
The Space Cadets have produced a beautifully tripped-out purple haze image with visual flaring effects to let you know Sirius is bright.
The Space Cadets also supply a starry eyed blue haze image from the Hubble Space Telescope with plenty of visuals effects so you don’t forget Sirius is really, really, bright.
More Down to Earth imagery presents a bluish off-white haze with plenty of glare and visual effects just in case you’ve forgotten Sirius is really, really, really bright.
The observer is left to decide for themselves whether the bluish off-white hue comes all the way from Sirius and/or is acquired when starlight from Sirius shines through the Earth’s atmosphere that famously fluoresces sky blue in sunlight and/or is caused by attenuation/extinction due to absorption by interstellar matter and cosmic dust.
The Space Cadets also throw in a bonus artist’s impression with Sirius surrounded by bluish off-white haze whilst it’s confused white dwarf companion impersonates a blurry blue dwarf.
The viewer is left to decide for themselves whether the bluish off-white haze surrounding Sirius A is a stellar corona or an artistic artefact that’s intended to remind the viewer that Sirius is really, really, really, really bright.
The imagery becomes more surreal when Sirius is compared to the Sun.
Sometimes the Sun looks grey because it helps us remember Sirius is really, really, really, really, really bright.
Sometimes the Sun looks like an hybrid orange-lemon because it helps us remember Sirius is really, really, really, really, really, really bright.
A standalone Sun photographed using a solar filter to “reduce the light intensity” looks a lot like the more sober representations of Sirius.
If the Space Cadets hadn’t decided Sirius was twice as massive as the Sun then the untutored observer might have difficulties differentiating between the two.
In fact, suggesting Sirius is “25 times more luminous than the Sun” seems remarkably capricious when [for mere mortals] the Sun is seen to be 13,000,000,000 times brighter than Sirius.
It’s simply stunning the Space Cadets believe they can just wish into existence a star that’s “25 times more luminous” per unit area than the Sun.
Sirius is the brightest star in the night sky… about twice as massive as the Sun and … is 25 times more luminous than the Sun …
The lux is the SI derived unit of illuminance, measuring luminous flux per unit area. It is equal to one lumen per square metre.
If Sirius and the Sun are [roughly] equivalent stars [because there’s no reason to think otherwise] then Sirius is [at best] 1.8 light years distant provided there’s no attenuation or extinction (or dimming) of its light due to absorption by interstellar matter and cosmic dust.
If starlight is subject to attenuation and extinction then the initial steepness of the Brightness Relative to Vega curve suggests a Sirius distance of only 362.45 AU is possible.
When Friedrich Bessel started pulling magic parallaxes out of his top hat in 1838 then the astronomers were obliged to pluck suitably luminous magic stars out of the æther.
After Bessel broke the arc-second-barrier in 1838 the astronomers started to scope out our Stellar Neighbourhood.
That’s the polite version.