egg changed the topic of #kspacademia to: https://git.io/JqLs2 | Dogs are cats. Spiders are cat interferometers. | Document well, for tomorrow you may get mauled by a ネコバス. | <UmbralRaptor> egg|nomz|egg: generally if your eyes are dewing over, that's not the weather. | <ferram4> I shall beat my problems to death with an engineer. | We can haz pdf | Logs: https://esper.irclog.whitequark.org/kspacademia
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<raptop> astronomers naming things: https://arxiv.org/abs/2505.04802
<galois> [arXiv] “ORBIT-2: Scaling Exascale Vision Foundation Models for Weather and Climate Downscaling” Xiao Wang, Jong-Youl Choi, Takuya Kurihaya et al. — «Sparse observations and coarse-resolution climate models limit effective regional decision-making, underscoring the need for robust downscaling. However, existing AI methods struggle with generalization across variables and geographies and are constrained by the quadratic…»
<WeylandsWings> raptop: how goes the PhD?
<raptop> mostly done, I need to add some paragraphs and bounce this draft off of my advisor
<WeylandsWings> still on r-v detection of exoplanets?
<raptop> yeah, though the paragraphs in question are on a functionally unrelated chapter because it's a paste-together thesis. (detecting a flux source in orbit for absolute photometric calibration)
<WeylandsWings> a flux source in what orbit? around the other star or around earth?
<raptop> Around earth, and a bunch of orbits were considered. It turns out that to get reasonable brightness for reasonable power, you want LEDs in either rather low orbit, or with some collimation
<raptop> On a related note, HST's absolute flux calibration is based off of 3 white dwarfs: GD 71, GD 153, GD 191-B2B
<WeylandsWings> why not just use something like LAGEOS and solar illumination on it
<WeylandsWings> because shouldnt that be pretty steady flux wise?
<raptop> I know some people were discussing reflected sunlight at times, but having a light source where you know exactly what it's doing/how bright it is important
<raptop> A ground based laser wouldn't have power restrictions the same way, though an atmospheric round trip would be annoying
<WeylandsWings> i mean it seems easier to use something already in orbit rather than trying to launch and use a new system
<raptop> At least some of it was looking into trying to get an orbit so that the satellite would be very near or in the same FoV as astornomical objects of interest from some sites
<WeylandsWings> i just dont see why you can use a set of sats that are pretty locked in orientation or are orientation agnostic in higher orbits with better sun illumination times
<raptop> I suspect that this is just old enough that moar ~~dakka~~ satellites wasn't considered too seriously. Higher orbits (eg: geosynch with funky eccentricity and/or inclination, as well as L2) were considered at times
<WeylandsWings> dakka?
<WeylandsWings> but like GPS or LAGEOS-like (etalon/lares/BLITS) in theory would be simmilar enough to each other and have a knowable crosssection/illumination that if you know the solar flux at that time (from GOES or the like) you should be able to get a knowable flux
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<raptop> Weirdly enough solar flux isn't known to enough precision (including how the sun is variable). And then you need to figure out the physical properties of the satellite (reflectivity, etc)
<WeylandsWings> even from live measurements?
<WeylandsWings> because doesnt GOES and other Space Weather sats measure live Solar Flux?