a8f394cf57463148061638283a2ec12865ee38ee
8
Commits
| Author | SHA1 | Message | Date | |
|---|---|---|---|---|
  SenrokaiandClaude Opus 5.5
|
a8f394cf57 |
Read a giant's temperature off its type as well as its correction, so a radius has one source
|
||
|
SenrokaiandClaude Opus 5.5
|
06b4ff64b5 |
Read a white dwarf past the table's blue end at the temperature white dwarfs of its colour have
|
||
|
SenrokaiandClaude Opus 5.5
|
31e0c04fe1 |
Read a colour past either end of the dwarf table at that end, where the star has no type instead
dwarfSequenceAtColor answers null outside Pecaut & Mamajek's table, B−V −0.301 to 2.16 and BP−RP −0.12 to 5.1, and effectiveTemperatureK then fell back on the type, which Gaia's stars do not have and carbon stars' parser does not read. 219 stars with a measured colour got no temperature and so no radius, and were drawn at the Sun's radius in the Sun's colour: 110 white dwarfs within 50 pc, 38 Gaia stars redder than BP−RP 5.1 (Gaia DR3 6439125097427143808, an ultracool dwarf 4.0 pc away), HD 46687, La Superba and the other carbon stars, and an O8 star. Past the table, the colour is now read at the row it is past (clampToTable), but only for a star with no readable type: beside a type an off-table colour is more often the bad measurement — HD 49748 is G5 V at B−V −0.32 — so the type still wins there, as it did. The luminosity reads the same point, so a star past the red end also gets the M8.5 row's G−V and correction. A type's own colour past the table, which only O types have, is read at B0. Carbon and S stars (C, N, R, S) now count as giants, so their correction stays their type's, not an M8.5 dwarf's −5.78. Measured on the shipped catalogue: stars without a temperature 3 053 -> 2 834, without a radius 3 077 -> 2 858; all 292 stars with an off-table colour now have a temperature, against 73. Gaia DR3 6439125097427143808 is 2 420 K and 0.110 R☉ (M8.5 V: 0.104); the 110 white dwarfs a median 0.018 R☉ at 10 700 K (0.0013 to 0.034); HD 46687 212 R☉ at 2 420 K and La Superba 133; audit #16's Gaia DR3 5612323414549657984, k1 Pup, B6 V at BP−RP −0.15, 203 L☉ and 4.1 R☉ against 143 and none (FLAME gives 336 and 3.49). The 2 851 stars left without a radius have neither a colour nor a readable type, or no band. Controls, each failing its named test: no clamp for an untyped star (2 of 784 failed), the clamp winning over a type, an O type's colour unclamped, the luminosity off the unclamped sequence, and carbon stars not counted as giants (1 of 784 each); clampToTable ignored (3 of 784). Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> |
||
|
SenrokaiandClaude Opus 5.5
|
d097f4b477 |
Correct a giant's light by its type, not by the cooler dwarf its colour reads as
|
||
|
SenrokaiandClaude Opus 5.5
|
2242fe0a7f |
Give every star a limb-darkened surface in its own colour, and light its planets with it
Every star but the Sun was a flat disc of one colour, and the Sun wore the texture pack's orange photograph, lit by the same white light as every other star's planets. Every star now shares one TSL material (starSurfaceMaterial in the scene): the Sun's map in grey, times the colour of a blackbody at the star's temperature, times a linear limb-darkening law, 1 - 0.6 (1 - mu), the Sun's coefficient in the visible. The temperature is the one the radius uses: the archive's st_teff for a host, else the dwarf sequence at its colour or type, else the Sun's. The colour comes from blackbodyColor (stellar.ts): Kim et al.'s cubic fit to the Planckian locus, then CIE XYZ to linear sRGB, brightest channel 1. At D65 it gives 2 900 K (255, 180, 103), 5 800 K (255, 241, 235) and 9 600 K (208, 219, 255), against (255, 182, 98), (255, 241, 231) and (211, 221, 255) in Charity's integrated blackbody table. The tint is a uniform, so the shader is built once and not per system. The star's PointLight takes the same colour against the Sun's, since the planets' photographs were taken in sunlight: the Sun's light stays white at pi, TRAPPIST-1's (2 566 K) is (1, 0.44, 0.10) and Proxima's (2 900 K) (1, 0.52, 0.17), Sirius's (0.52, 0.67, 1). The intensity stays pi. No halo comes back. sun.jpg was 2048 by 1024 and 822 427 bytes for a disc that reaches 216 px across at the Sun's closest approach on a 1080-line screen. It is now 1024 by 512 in grey, 31 306 bytes, which covers the disc to a 1440-line screen. Its brightness varied by 56 % rms, which made every star a mottled rock; it is rescaled to 14 % rms about the display's white, of the order of the Sun's granulation contrast, the brighter half clipped as in a photograph exposed for the disc (6 % rms remains). Measured on the dev server (1600 by 1000, the camera at its closest approach): - the disc's brightness against the law, from r/R 0.52 to 0.97: Sun 0.970/0.841/0.763/0.657/0.560 against 0.927/0.829/0.755/0.645/0.554, ups And and Sirius the same to within 0.05; - the disc's centre in sRGB: Sun (245, 233, 226), ups And (F8V, 6 157 K) (249, 239, 239), Sirius (199, 209, 243); - the first system entry of a fresh page, three runs each in alternating blocks against the previous commit: Sol's longest task 90 ms before, 86 ms after, two tasks over 50 ms in every run either way; Proxima Centauri's none over 50 ms after, one run of six with a 53 ms task before. The long tasks on Sol's first entry predate this change. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> |
||
|
SenrokaiandClaude Opus 5.5
|
7213f987c4 |
Draw every star at its own radius, measured where the archive has one and derived otherwise
The system view drew the Sun at its own radius and every other star at 0.45 of its innermost orbit, capped at 0.2 AU: a size chosen so the star would not swallow its planets, not the star's. Proxima Centauri was drawn at 2.8 solar radii, eighteen times its own, and every star without planets at 43. starSurfaceOf (body-view-model.ts) now gives each star a radius and a temperature. A planet host takes the archive's st_rad and st_teff from its planets' rows: 4 439 hosts are drawn at a measured radius, 22 at a derived one. Every other star's is derived: its temperature off Pecaut & Mamajek's dwarf sequence at its colour (the same table the spectral estimate reads, or at the colour its type implies where it has none), its luminosity from its absolute magnitude and the bolometric correction luminositySolar already applies, and R = sqrt(L) / (T / 5772 K)^2. Against the archive's own st_rad for the 1 447 catalogue hosts that have one, the derived radius is within 0.018 dex at the median, 0.071 dex at the 90th percentile, and within a factor of 1.5 for 97.1 %. Sirius comes out 1.79 solar radii (1.711 published, Liebert et al. 2005), Wolf 359 0.117, Betelgeuse 584, the Sun exactly 1. A star with no band has only the ETL's stand-in magnitude, and gets no derived radius: PSR J1719-1438 came out 2.3 solar radii from it, wider than its planet's orbit. With the stars that have neither a colour nor a type, that leaves 3 077 of 455 608 stars (274 of 4 735 hosts) with no radius; they are drawn at the Sun's, and their card gives none. The card says which it is: "Radius 0.141 solar radii" for a published one, "~0.10 solar radii, from colour and brightness" for a derived one, two figures because colour does not give three. A giant drawn at its size can be wider than its system, so systemFramingDistanceAu also makes room for the star, and the controls' closest approach is now three of the star's radii where that is more than the old 0.05 AU. 23 211 stars are drawn wider than 3.6 solar radii, which put 0.05 AU inside three of their radii, and a zoom would have carried the camera through the surface of the largest. The Sun keeps 0.05 AU. starMarkerRadiusAu and the renderer's innermost axis, which only it read, are gone. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> |
||
|
SenrokaiandClaude Opus 5.5
|
3392f06c85 |
Read a star's bolometric correction off its colour, and carry Gaia's G to V first
A star's luminosity was its absolute magnitude plus a bolometric correction read off its spectral type, with its magnitude taken as V whatever band it was in. Gaia classifies none of its stars, so all of its 379 000 got the Sun's correction, and their G was read as V: TRAPPIST-1 came out at a seventh of its luminosity. The dwarf sequence spectral.ts already reads types off (Pecaut & Mamajek 2013, table 5, online version 2022.04.16) now carries its effective temperature, bolometric correction to V and Gaia G-V columns, and dwarfSequenceAtColor interpolates them at a colour, in the colour's own system. luminositySolar uses it wherever the star's colour is inside the table: the G magnitude is carried to V, then corrected. Only without such a colour does it fall back to the spectral type, as before. Against the archive's own st_lum for the 1 449 hosts that are catalogue stars, the median error goes from 0.038 to 0.022 dex and the 90th percentile from 0.292 to 0.115 dex; within a factor of 1.5, 84.5 % -> 93.8 %. For the 572 hosts Gaia describes: 90th percentile 0.332 -> 0.073 dex, 81.8 % -> 97.0 % within a factor of 1.5. Barnard's Star with no type now reads 0.0029 L_sun against 0.0035 published, and TRAPPIST-1 7.3e-4 against 5.5e-4 (Agol et al. 2021). Across the catalogue, 311 255 of 455 608 stars move by more than 10 % (median ratio 0.90: a G-type star's G is 0.16 brighter than its V), and so do the hosts of 3 158 planets, whose equilibrium temperatures follow as the fourth root. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> |
||
|
Claude
|
ac296f5133 |
Derive a surface for every body that was never photographed
Fifteen bodies here have a real photograph. Every exoplanet does not, and never will on current instruments — none has ever been imaged — and nor do several of the solar system's own moons. Those all shared one crude stand-in: a few noisy bands tinted by category, cached per colour, so every exoplanet in the app was literally the same picture. They now get a surface reasoned from what has actually been measured. The chain is standard at every link. A host star's luminosity comes from its catalogued apparent magnitude and its parallax distance — that pair is exactly an absolute magnitude — plus a bolometric correction for its spectral class. The correction is not optional: an M dwarf radiates most of its light in the infrared, so its visual magnitude understates it more than tenfold, and M dwarfs are what most nearby planet hosts are. Luminosity and the semi-major axis then give an equilibrium temperature, mass and radius give a bulk density, and size, temperature and density together give a class of world. Checked against the solar system the temperatures land on Earth 255 K, Jupiter 112 K, Neptune 46 K, all within a kelvin or two of published values, and 51 Pegasi b comes out at 1227 K against a published 1200. Each class carries a palette reasoned from its chemistry — methane absorbs red light, which is why the ice giants are blue — and a structure: zonal bands for a body with a fluid envelope, because a rapidly rotating atmosphere organises into them, and fractal terrain for one with a solid surface. Polar caps grow and shrink with the derived temperature, which is the clearest visible consequence of the whole chain. The generator samples three-dimensional noise along the sphere rather than a flat field, so there is no seam to stitch at the antimeridian and no pinching at the poles, and it writes into a byte array rather than a canvas — a pure function, testable, with no 2D context to be unavailable. Two things the derivation cannot do, both stated on screen next to the measurements it rests on. Equilibrium temperature ignores greenhouse warming and internal heat, so Venus comes out at 300 K against a real surface of 737 K and Io, kept molten by tides, classifies as ice. And these are illustrations: reasoned, but not observations. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01WaySiNst4HhDXBHnMy8p5G |