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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 sky out to a distance, in layers: the stars and galaxies nearer than 10, 50, 100, 500 or 1,000 light-years, each distance band its own colour, the ones with an uncertain distance kept apart, and none placed at a guess

starInputfunction

A bright star of the Yale catalogue as a thing with a distance, from its parallax and its error. A star with no parallax has no distance.

Import it

import { starInput } from "@johnmorrisdotca/hoshi-stars/distance";

Definition

function starInput(star: Pick<Star, "hr" | "name" | "rightAscension" | "declination" | "magnitude" | "parallaxMas" | "parallaxErrorMas">): DistanceInput

Parameters

NameTypeDescription
starPick<Star, "hr" | "magnitude" | "name" | "rightAscension" | "declination" | "parallaxMas" | "parallaxErrorMas">

A star from stars().

Returns

DistanceInput

The input for layersByDistance.

Examples

import { starByName } from "@johnmorrisdotca/hoshi-stars";
import { starInput } from "@johnmorrisdotca/hoshi-stars/distance";

const sirius = starInput(starByName("Sirius")!);
console.log(sirius.id, sirius.lightYears?.toFixed(1), sirius.certainty);
hr-2491 8.5 good

What it prints (run when this page was built)

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