Skip to the content

Hoshi Stars星

The stars you can see without a telescope, with names, colours and distances; the 88 constellations with their lines and boundaries; the Messier objects; and seven map projections to draw them on.

Hoshi is the Japanese word 星 for a star. About the name

Contents

Reference · A star's profile: temperature, size, luminosity and disc size with their uncertainty, limb darkening, and the measured shapes of Altair, Regulus and Vega

StarRotationtype

How fast a star spins, as the Bright Star Catalogue gives it: the projected speed of its equator, v sin i. The true speed is that or more (the tilt of the axis is not known from it).

Import it

import type { StarRotation } from "@johnmorrisdotca/hoshi-stars/profile";

Definition

interface StarRotation {
    vSinIKmS: number;
    upperLimit: boolean;
    uncertain: boolean;
}

Members

NameTypeDescription
vSinIKmSnumber

v sin i in kilometres a second.

upperLimitboolean

The catalogue gives it as an upper limit (<): the star spins at most this fast across the line of sight.

uncertainboolean

The catalogue marks it uncertain (:).

Examples

import { starRotation, type StarRotation } from "@johnmorrisdotca/hoshi-stars/profile";

const phecda: StarRotation | undefined = starRotation(4554);
console.log(phecda?.vSinIKmS, phecda?.upperLimit);
168 false

What it prints (run when this page was built)

View sourceEdit on GitHubMade from the source of @johnmorrisdotca/hoshi-stars 0.47.0.