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@behaver/pluto99-hecc

v1.0.4

Published

This pkg is a calculator for J2000 heliocentric ecliptic coordinate of pluto on pluto99 theory.

Downloads

39

Readme

Pluto99HECC

GitHub license npm version PRs Welcome

简介

Pluto99HECC 是计算冥王星 J2000 日心平黄经坐标的组件库,其使用的算法为 Pluto99 算法。

计算时效

本组件的计算有效时间范围是:从 -2998/04/23,JDE 626150.5 至 2984/07/26,JDE 2811150.5

计算精度

相较于 DE406 的最大误差:0.00005 AU 在日冥距离最小时,且地球在太阳和冥王星中间时,精度最差。 冥王星的近日点为29.65 AU,所以地冥的最小距离为28.65 AU。已知的最大误差0.00005 AU,等效于 arctan(0.00005/28.65) 弧度,即 0.37 角秒。

安装

通过 npm 安装,在你的 node 项目目录下执行:

npm install @behaver/pluto99-hecc

安装完成后,调用即可:

const PlutoHECC = require('@behaver/pluto-hecc');

用例

const PlutoHECC = require('@behaver/pluto-hecc');
const { JDateRepository } = require('@behaver/jdate');

let jdr = new JDateRepository(2446896);
let pluto = PlutoHECC(jdr);

// 获取冥王星 J2000 日心黄道 x 坐标
let x = pluto.x;

// 获取冥王星 J2000 日心黄道 y 坐标
let y = pluto.y;

// 获取冥王星 J2000 日心黄道 z 坐标
let z = pluto.z;

// 获取冥王星 J2000 直角坐标
let rc = pluto.rc;

API

constructor(jdate)

构造函数

  • jdate 参照儒略时间

get x()

获取 冥王星 J2000 日心黄道坐标 x 值

get y()

获取 冥王星 J2000 日心黄道坐标 y 值

get z()

获取 冥王星 J2000 日心黄道坐标 z 值

get rc()

获取 冥王星 J2000 日心黄道球坐标

get obTime()

获取观测儒略时间

set obTime(jdr)

设定观测儒略时间

  • jdr 儒略时间对象

许可证书

The MIT license.