Create sky coordinates

Create a vector of sky coordinates in degrees.

Usage

sky_coord(lon = double(), lat = double(), frame = icrs())

Arguments

lon

Longitude-like coordinate in degrees.

For `frame = icrs()`, this is right ascension (`ra`) and must be between `0` and `360`.

For `frame = galactic()`, this is Galactic longitude (`l`) and must be between `0` and `360`.

lat

Latitude-like coordinate in degrees.

For `frame = icrs()`, this is declination (`dec`) and must be between `-90` and `90`.

For `frame = galactic()`, this is Galactic latitude (`b`) and must be between `-90` and `90`.

frame

A sky frame object. Supported frames are icrs() and galactic(). The default is icrs().

Value

A <sky_coord> vector.

Examples

x <- sky_coord(10, 20)
x
#> <sky|icrs>[1]
#> [1] (10, 20)

g <- sky_coord(120, -30, frame = galactic())
g
#> <sky|galactic>[1]
#> [1] (120, -30)

ra_dec(10, 20)
#> <sky|icrs>[1]
#> [1] (10, 20)
gal_coord(120, -30)
#> <sky|galactic>[1]
#> [1] (120, -30)