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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 · Black holes: 301 with a place, a mass and distance with ranges, how each was found and the paper behind each fact

BlackHoleMeasuretype

A number the papers give with its range: the best value, and the lowest and highest the paper allows, or only a limit.

Import it

import type { BlackHoleMeasure } from "@johnmorrisdotca/hoshi-stars/black-holes";

Definition

interface BlackHoleMeasure {
    value: number | undefined;
    low: number | undefined;
    high: number | undefined;
    limit: "lower" | "upper" | undefined;
}

Members

NameTypeDescription
valuenumber | undefined

The best value, or undefined where the paper gives only a range.

lownumber | undefined

The lowest value the paper allows (about one standard deviation below, or the bottom of a range), or undefined.

highnumber | undefined

The highest value the paper allows, or undefined.

limit"lower" | "upper" | undefined

"lower" where value is only a lower limit (a minimum), "upper" where it is only an upper limit, else undefined.

Examples

import { blackHole, type BlackHoleMeasure } from "@johnmorrisdotca/hoshi-stars/black-holes";

const mass: BlackHoleMeasure = blackHole("Cygnus X-1")!.massSuns!;
console.log(mass.value, mass.low, mass.high);
21.2 19 23.4

What it prints (run when this page was built)

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