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@behaver/fixed-star-locator

v1.1.0

Published

This pkg is builded for calculating the position of fixed star.

Downloads

2

Readme

FixedStarLocator

GitHub license npm version PRs Welcome

简介

FixedStarLocator 是一个用于计算恒星赤道坐标的天文组件,计算的结果最终将以 EquinoctialCoordinate 实例返回。

安装

通过 npm 安装,在你的 node 项目目录下执行:

npm install @behaver/fixed-star-locator

安装完成后,调用即可:

const FixedStarLocator = require('@behaver/fixed-star-locator');

用例

const { JDateRepository } = require('@behaver/jdate');
const FixedStarLocator = require('@behaver/fixed-star-locator');

// 实例化儒略时间对象
let jdate = new JDateRepository(2462088.69, 'jde');

// 实例化恒星赤道坐标计算组件
let FSC = new FixedStarLocator;

// 获取赤道坐标组件
let res = FSC.get({
  time: jdate,
  ra: 41.0500,
  dec: 49.2283,
  pmra: 0.336,
  pmdec: -0.089,
  radvel: 25,
  parallax: 0.089,
});

let eqc = res.coord;

// 输出赤经,单位:°
console.log(eqc.longitude.getDegrees());

// 输出赤纬,单位:°
console.log(eqc.latitude.getDegrees());

// 输出赤地心距,单位:AU
console.log(eqc.radius);

API

constructor(options)

构造函数

options(options)

设置定位参数项:

  • options.id 位置id
  • options.ra J2000 平赤经,单位:°
  • options.dec J2000 平赤纬,单位:°
  • options.parallax 周年视差,单位:角秒
  • options.pmra 赤经自行,单位:角秒每儒略年
  • options.pmdec 赤纬自行,单位:角秒每儒略年
  • options.radvel 日心视向速度,单位:km/s
  • options.time 儒略时间对象
  • options.model 计算模型字串

get(options)

获取恒星赤道坐标对象

set id(value)

设定 位置id

get id()

获取 位置id

set time(value)

设置 儒略时间对象

get time()

获取 儒略时间对象

set model(value)

设置 计算模型

get model()

获取 计算模型

set ra(value)

设定 恒星 J2000 平赤经(单位:°)

get ra()

获取 恒星 J2000 平赤经(单位:°)

set dec(value)

设定 恒星 J2000 平赤纬(单位:°)

get dec()

获取 恒星 J2000 平赤纬(单位:°)

set parallax(value)

设定 周年视差(单位:角秒)

get parallax()

获取 周年视差(单位:角秒)

set pmra(value)

设定 赤经自行(单位:角秒每儒略年)

get pmra()

获取 赤经自行(单位:角秒每儒略年)

set pmdec(value)

设定 赤纬自行(单位:角秒每儒略年)

get pmdec()

获取 赤纬自行(单位:角秒每儒略年)

set radvel(value)

设定 日心视向速度(单位:km/s)

get radvel()

获取 日心视向速度(单位:km/s)

许可证书

The ISC license.