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Hoshi Stars星

肉眼で見える星の名前・色・距離、88星座の線と境界、メシエ天体、そしてそれらを描くための7種類の図法を使えます。

「星」(ほし) は、夜空に光って見えるものです。 名前について（英語）

目次

リファレンス · メシエ天体の空での大きさと向き、その輪郭

DeepSkyShape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。

How big a deep-sky object is on the sky and which way it lies. Each part is a measurement or it is undefined: nothing is guessed. Where the minor axis or the angle is missing, the object is known to be at least that large and no more.

インポート

import type { DeepSkyShape } from "@johnmorrisdotca/hoshi-stars/deep-sky/shape";

ほかのエクスポート元: @johnmorrisdotca/hoshi-stars/deep-sky/ngc-ic-shape

定義

interface DeepSkyShape {
    majorArcmin: number | undefined;
    minorArcmin: number | undefined;
    positionAngle: number | undefined;
    source: DeepSkyShapeSource | undefined;
}

メンバー

名前型説明
majorArcminnumber | undefined

The longest way across, in arc-minutes, or undefined where no catalogue gives one.

minorArcminnumber | undefined

The shortest way across, in arc-minutes, or undefined where it is not measured (then the object is drawn round, at the major diameter).

positionAnglenumber | undefined

The angle of the major axis in degrees, 0 up to 180, measured from north through east (90 is east-west), or undefined where it is not measured.

sourceDeepSkyShapeSource | undefined

The catalogue of the major axis, or undefined with it.

例

import { deepSkyShape } from "@johnmorrisdotca/hoshi-stars/deep-sky/shape";
import { deepSkyObject } from "@johnmorrisdotca/hoshi-stars/deep-sky";

const shape = deepSkyShape(deepSkyObject("M31")!);
console.log(shape.majorArcmin, shape.minorArcmin, shape.positionAngle, shape.source);
190.5 61.7 35 RC3

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/hoshi-stars 0.47.0 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。