The colours of Sirius: first astrophoto outing with the new iPhone 15 Pro 🙂👍
Hand held & manually trailed from top-left to bottom-right during a 30 sec long timelapse with ProCam, using the telephoto camera deliberately defocussed, 1/30 sec individual exposure time ⭐️📷
@mattkenworthy It’s simple to do (no telescope or binoculars needed, just a phone) once you’ve figured out the best individual exposure time in whichever app you use for light trails.
But if anyone knows the characteristic atmospheric scintillation timescale in the visible, it’ll be you, Matt 🙂👍
Hurry back from NZ though – Sirius is too high in the sky there! 🙃
@ranx Many stars twinkle, but Sirius is one of the only ones bright enough that you can see the colours with the naked eye too (cones versus rods).
Size & distance don’t matter, just the brightness (although of course nearby stars tend in general to be brighter).
And indeed, all stars except the Sun are point sources to the human eye & that’s important to twinkling too. Extended sources like the planets don’t twinkle nearly as much, if at all.
@enigma@ranx Details, details 🙂 Yes, I probably should have mentioned the fact that it’s our Earth atmosphere that makes the starlight twinkle, but hey 🤷♂️
Am not sure if it’s exclusively on frosty nights, although those are usually clear, still, & cold, so that warm air rising from buildings can create the strong turbulence needed for obvious naked-eye twinkling.
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