SenrokaiandClaude Opus 5.5
a81dd491ad
The readout named Hipparcos, Yale and Gliese while 378 775 of the 455 608 stars are described by Gaia DR3, printed one "Magnitude" for G and V alike, and gave every distance to the parsec. The band cannot be read off the star's source, which records whose position it has: 62 002 stars Gaia places keep HYG's V and B-V, and the 575 hosts renamed after their planets are Gaia's, in G. stars-meta.bin gains two byte columns, 14 to 16 bytes a star (6 378 512 to 7 289 728 bytes; gzip -9 2 804 049 to 3 110 991). One holds the magnitude's band (V 76 555 stars, G 378 744, none 309, whose magnitude is a stand-in), which colour the colour index is (B-V 75 203, BP-RP 376 703), and whether the distance is Gaia's parallax. The other holds the distance's relative error as its square root in 255ths: a step is 0.08 % of distance at 1 %, 0.35 % at 20 %, and 100 % is the top. encode, decode, BYTES_PER_STAR_META and the build.ts round trip cover both; no workflow reads the format. Where the errors come from: - Gaia rows keep the parallax_error their query already fetched: median 0.3 %, 90th percentile 1.2 %, at most 20 %, the query's own cut. - A HYG star at Gaia's distance takes the cross-match's parallax_over_error, and a star merged into a Gaia entry keeps that entry's error with its position. - The 3 067 Hipparcos stars that keep their Hipparcos distance, Rigel, Deneb and Alnilam among them, take e_plx from van Leeuwen's 2007 reduction: a new cached query of public.hipparcos_newreduction on the ESA archive, whose 117 955 rows HYG's distances invert. - The archive's stars take sy_disterr1/2 from pscomppars, in a query and cache file of their own so the composite rows already cached were not refetched. - 439 distances have no published error: 357 Gliese rows and 82 archive hosts. Of the errors, 392 786 are 1 % or less and are not printed; 61 156 print as "117 ± 12 pc" to the distance's own digits; 1 196 between 20 and 100 %, and 30 past it, print as the range the parallax gives, since a symmetric error in parallax is a lopsided one in distance. The star card (measured on the dev server) now reads, for example: - Rigel: 265 ± 23 pc, V 0.18, B-V -0.03, source HYG. - Deneb: 433 ± 60 pc. - Alnilam: "476 pc to 833 pc" (Hipparcos 1.65 ± 0.45 mas). - Gaia DR3 5612323414549657984: 111 ± 2 pc, G 4.63, BP-RP -0.15, source Gaia DR3. - Proxima Centauri: 1.30 pc, V 11.01, source "HYG, Gaia DR3 distance". - TRAPPIST-1: G 15.62, BP-RP 4.90, source Gaia DR3. - Kepler-186: V 15.14, source NASA Exoplanet Archive. The neighbourhood's subtitle reads "Gaia DR3 378,775 · HYG 73,556 · NASA Exoplanet Archive 3,277", counted by the catalogue describing each star. build.ts validateStars now fails a catalogue with more than 1 000 stars without a band (309 today) or without a distance error (439). Dropping G from the Gaia rows gave 379 040 without a band, and dropping their parallax_error gave 441 216 without an error; both runs failed. Decoding the catalogue in Node took a median 29 ms before and 24 ms after (nine runs each, within noise). In the app, five cold boots gave a 654-786 ms long task after the data landed and the HUD at 1.83-2.07 s. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
81 lines
3.2 KiB
TypeScript
81 lines
3.2 KiB
TypeScript
import { describe, expect, it } from 'vitest';
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import { StarRecord } from '../../shared/models/star.model';
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import { catalogueCensus, describingCatalogue, starReadouts } from './star-readouts';
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/** Three kinds of star the catalogue holds, each as the decoder gives it back. */
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const HYG_STAR: StarRecord = {
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id: 32263,
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name: 'Sirius',
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x: -0.49,
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y: 2.47,
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z: -0.75,
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magnitude: -1.44,
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magnitudeBand: 'V',
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spectralType: 'A0m',
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colorIndex: 0.009,
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colorSystem: 'B-V',
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distanceError: 0.004,
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distanceFromGaia: false,
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source: 'hyg'
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};
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// A star Gaia alone knows, at 117 pc and good to a tenth.
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const GAIA_STAR: StarRecord = {
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id: 1000000001,
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name: 'Gaia DR3 5612323414549657984',
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x: 117,
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y: 0,
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z: 0,
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magnitude: 11.2,
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magnitudeBand: 'G',
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spectralType: 'Unknown',
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colorIndex: 1.43,
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colorSystem: 'BP-RP',
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distanceError: 0.1,
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distanceFromGaia: true,
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source: 'gaia'
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};
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// HYG's description of Proxima, at the place and distance Gaia measures.
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const PLACED_BY_GAIA: StarRecord = { ...HYG_STAR, name: 'Proxima Centauri', magnitude: 11.01, colorIndex: 1.807, spectralType: 'M5Ve', distanceFromGaia: true, source: 'gaia' };
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function value(readouts: { label: string; value: string }[], label: string): string | undefined {
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return readouts.find((readout) => readout.label === label)?.value;
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}
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describe('starReadouts', () => {
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it('names the band of the magnitude, and which colour the colour index is', () => {
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expect(value(starReadouts(HYG_STAR, null), 'Magnitude')).toBe('V -1.44');
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expect(value(starReadouts(GAIA_STAR, null), 'Magnitude')).toBe('G 11.20');
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expect(value(starReadouts(HYG_STAR, null), 'Colour')).toBe('B−V 0.01');
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expect(value(starReadouts(GAIA_STAR, null), 'Colour')).toBe('BP−RP 1.43');
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});
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it('says a stand-in magnitude was not measured, and leaves out a colour there is none of', () => {
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const unmeasured = starReadouts({ ...GAIA_STAR, magnitude: 12, magnitudeBand: undefined, colorIndex: null, colorSystem: undefined }, null);
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expect(value(unmeasured, 'Magnitude')).toBe('Not measured');
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expect(value(unmeasured, 'Colour')).toBeUndefined();
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});
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it('gives the distance with its uncertainty', () => {
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expect(value(starReadouts(GAIA_STAR, null), 'Distance')).toBe('117 ± 12 pc');
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});
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it('names the catalogue a star comes from, and whose distance it has', () => {
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expect(value(starReadouts(GAIA_STAR, null), 'Source')).toBe('Gaia DR3');
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expect(value(starReadouts(HYG_STAR, null), 'Source')).toBe('HYG');
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expect(value(starReadouts(PLACED_BY_GAIA, null), 'Source')).toBe('HYG, Gaia DR3 distance');
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expect(value(starReadouts({ ...HYG_STAR, source: 'exoplanet-archive' }, null), 'Source')).toBe('NASA Exoplanet Archive');
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});
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it('marks the luminosity as derived', () => {
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expect(starReadouts(HYG_STAR, 25.4).find((readout) => readout.label === 'Luminosity')).toEqual({ label: 'Luminosity', value: '25.40 L☉', derived: true });
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});
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});
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describe('catalogueCensus', () => {
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it('counts the stars by the catalogue describing them, not by whose position they have', () => {
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expect(describingCatalogue(PLACED_BY_GAIA)).toBe('HYG');
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expect(catalogueCensus([GAIA_STAR, GAIA_STAR, GAIA_STAR, HYG_STAR, PLACED_BY_GAIA])).toBe('Gaia DR3 3 · HYG 2');
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});
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});
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