deepSkyShapefunction

The size, axis ratio and angle of a Messier object on the sky. For a galaxy they are RC3's (the major axis at the 25th magnitude isophote, the axis ratio and the angle) or, where RC3 has none, NASA/IPAC NED's; for any other Messier object, and for a galaxy with neither, the one diameter that the object's own row carries (sizeArcmin), with no ratio and no angle. Every part is a measurement or undefined; the sources are in NOTICE.md.

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

function deepSkyShape(object: DeepSkyObject): DeepSkyShape

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

const shape = deepSkyShape(deepSkyObject("M31")!);
console.log(shape.majorArcmin, shape.minorArcmin, shape.positionAngle);

190.5 61.7 35