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@behaver/fixed-star-position

v1.0.2

Published

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

Downloads

2

Readme

FixedStarPosition

GitHub license npm version PRs Welcome

简介

FixedStarPosition 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-position

安装完成后,调用即可:

const FixedStarPosition = require('@behaver/fixed-star-position');

用例

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

// 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 FixedStarPosition(jdate);

// 获取赤道坐标组件
let eqc = FSC.get({
  RA: 41.0500,
  Dec: 49.2283,
  PMRA: 0.336,
  PMDec: -0.089,
  radVel: 25,
  parallax: 0.089,
});

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

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

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

API

constructor(epoch, model)

构造函数

  • epoch 目标历元
  • model 计算模型:'dyn': 动力学; 'tri': 三角学;

get(options)

获取恒星赤道坐标对象

  • 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

set epoch(value)

设置目标历元对象

get epoch()

获取目标历元对象

set model(value)

设置计算模型

get model()

获取计算模型缩写字串

许可证书

The ISC license.