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Hoshi Stars星

The stars you can see without a telescope, with names, colours and distances; the 88 constellations with their lines and boundaries; the Messier objects; and seven map projections to draw them on.

Hoshi is the Japanese word 星 for a star. About the name

Contents

Reference · The faint stars: about 3 million of UCAC4's, to magnitude 12, in sky tiles loaded for the part of the sky you show

faintStarsInfunction

The stars of some decoded tiles that lie in a round patch of sky and are as bright as a limit, brightest first. With max, the brightest max of them: the list is then complete only to depth, which is the magnitude the list is cut at.

Import it

import { faintStarsIn } from "@johnmorrisdotca/hoshi-stars/faint";

Definition

function faintStarsIn(tiles: Iterable<FaintTile>, field: FaintField, limit?: number, max?: number): { stars: FaintStar[]; depth: number; }

Parameters

NameTypeDescription
tilesIterable<FaintTile>

Decoded tiles, from decodeFaintTile (any more than the field needs is fine).

fieldFaintField

The patch.

limit (optional)number

The faintest magnitude wanted; 12 where left out.

max (optional)number

The most stars to return; all of them where left out.

Returns

{ stars: FaintStar[]; depth: number; }

The stars, and depth: the faintest magnitude the list holds all the stars of: limit when nothing was cut, else the magnitude of the cut (stars a step fainter are left out).

Examples

import { faintStarsIn, type FaintTile } from "@johnmorrisdotca/hoshi-stars/faint";

const tiles: FaintTile[] = []; // the tiles of faintTilesFor(field), fetched and decoded
const { stars, depth } = faintStarsIn(tiles, { rightAscension: 83.8, declination: -5.4, radius: 1 }, 11, 2000);
console.log(stars.length, depth);
0 11

What it prints (run when this page was built)

View sourceEdit on GitHubMade from the source of @johnmorrisdotca/hoshi-stars 0.47.0.