`Star`型

リファレンスの説明と例は英語です。見出しと目次は日本語です。

One star, as the Yale Bright Star Catalogue gives it. Positions are J2000 (equator and equinox of 2000, the FK5 frame, which is the ICRS to a fraction of an arc-second).

インポート

import type { Star } from "@johnmorrisdotca/wakusei-planets/stars";

定義

interface Star {
    hr: number;
    name: string | undefined;
    designation: string | undefined;
    constellation: string | undefined;
    rightAscension: number;
    declination: number;
    magnitude: number;
    colourIndex: number | undefined;
    spectralClass: string;
    properMotionRaMas: number;
    properMotionDecMas: number;
    parallaxMas: number;
}

メンバー

名前	型	説明
`hr`	`number`	The Bright Star Catalogue (Harvard Revised) number: stable, and the key for `starByHr`.
`name`	`string \| undefined`	The common name where the star has one (the IAU Working Group on Star Names' spelling), else `undefined`.
`designation`	`string \| undefined`	The Bayer letter and constellation (`α CMa`), else the Flamsteed number and constellation (`9 CMa`), else `undefined`.
`constellation`	`string \| undefined`	The IAU three-letter constellation abbreviation (`CMa`) where the star has a Bayer or Flamsteed name, else `undefined`.
`rightAscension`	`number`	Right ascension in degrees at J2000, 0 up to 360. The catalogue gives it to a tenth of a second of time (1.5 arc-seconds at the equator).
`declination`	`number`	Declination in degrees at J2000, -90 to 90. The catalogue gives it to an arc-second.
`magnitude`	`number`	Visual magnitude: smaller is brighter, and Sirius is -1.46.
`colourIndex`	`number \| undefined`	The colour index B-V in magnitudes, or `undefined` where the catalogue has none. Hot blue stars are about -0.3, the Sun 0.65, cool red stars above 1.5.
`spectralClass`	`string`	The spectral class and subclass (`A1`, `K1`), or an empty string where the catalogue gives none we read.
`properMotionRaMas`	`number`	Proper motion in right ascension, in milliarcseconds a year, already multiplied by cos(declination) (a true angle on the sky).
`properMotionDecMas`	`number`	Proper motion in declination, in milliarcseconds a year.
`parallaxMas`	`number`	The annual parallax in milliarcseconds; 0 where the catalogue has none (the distance is then unknown).

例

import { starByName, type Star } from "@johnmorrisdotca/wakusei-planets/stars";

const sirius: Star = starByName("Sirius")!;
console.log(sirius.designation, sirius.magnitude);

α CMa -1.46

出力（このページを作ったときに実行した結果）

ソースを見る GitHub で編集@johnmorrisdotca/wakusei-planets 0.24.0 のソースから作成しました。

この日本語は、まだ日本語を母語とする方の確認を受けていません。訂正を歓迎します。

Star型

定義

メンバー

例

`Star`型