Parse coordinate strings into ICRS sky_coord — parse

Parse a character vector of ICRS coordinates into a `sky_coord` vector. The parser currently supports two input families:

Usage

parse_coord(x = character())

Arguments

x: Character vector with ICRS coordinates. `NA` values are preserved.

Value

A <sky_coord> vector in ICRS frame.

Details

1. Compact J-style token (can appear inside catalog names): - `JHHMMSS(.s)+DDMMSS(.s)` - examples: `"J230631.0+155633"`, `"SRGA J230631.0+155633"`

2. Sexagesimal token with full components: - `HH MM SS +/-DD MM SS` - all six components are required (no partial forms) - separators may be spaces, `:`, or HMS/DMS markers (`h m s d \u00B0 ' "`) - examples: `"12 34 56 -76 54 3.210"`, `"12:34:56 -76:54:3.210"`, `"12h34m56s -76d54m3.210s"`

Examples

library(astrocoords)

parse_coord("12 34 56 -76 54 3.210")
#> <sky|icrs>[1]
#> [1] 12h34m56.0s -76°54'03"

parse_coord("12:34:56 -76:54:3.210")
#> <sky|icrs>[1]
#> [1] 12h34m56.0s -76°54'03"

parse_coord("12h34m56s -76d54m3.210s")
#> <sky|icrs>[1]
#> [1] 12h34m56.0s -76°54'03"

parse_coord(c(
  "SRGA J230631.0+155633",
  "J230631.0+155633",
  "12:34:56 -76:54:3.210"
))
#> <sky|icrs>[3]
#> [1] 23h06m31.0s +15°56'33" 23h06m31.0s +15°56'33" 12h34m56.0s -76°54'03"