Expand description
Identify which catalogued sky objects a telescope frame covers, given a pointing (right ascension / declination) and a field of view (derived from optics, or supplied directly).
A caller-supplied set of catalogue objects is ranked by angular separation from the pointing; objects inside the frame’s membership shape are flagged. Matching uses sky position only — a designation may ride along on a result for display, but it never influences the match.
The crate holds no catalogue data and performs no I/O. A consumer supplies
its own objects — from a database, a file, a name resolver, or a hand-built
list — by implementing the matcher module’s SkyObject trait.
Coordinate and angle types come from the skymath crate and appear
directly in this crate’s signatures: construct positions with
skymath::Equatorial and angles with skymath::Angle. The crate is
re-exported as target_match::skymath so consumers can name a
version-matched skymath without a separate dependency entry.
§Modules
optics— plate scale and field-of-view geometry from focal length, pixel size (x/y), binning (x/y), and sensor dimensions — or a directly supplied pixel scale / field of view — plus the search-radius policies.matcher— theSkyObjectinput trait, match constraints (radius, rectangular field of view, nearest-N), and deterministic ranking.
§Example
use skymath::{Angle, Equatorial, ParseMode};
use target_match::{rank, Constraint, Field, Optics, RadiusPolicy, SkyObject};
struct Target { name: &'static str, ra: f64, dec: f64 }
impl SkyObject for Target {
fn position(&self) -> Equatorial {
Equatorial::j2000(Angle::from_degrees(self.ra), Angle::from_degrees(self.dec)).unwrap()
}
}
let catalog = [
Target { name: "M 31", ra: 10.6847, dec: 41.2688 },
Target { name: "M 33", ra: 23.4621, dec: 30.6599 },
];
let pointing = Equatorial::parse_j2000("00:42:44.3", "+41:16:09", ParseMode::Strict).unwrap();
let field = Field::from_optics(Optics {
focal_mm: 800.0, pixel_um: (3.76, 3.76), binning: (1, 1), pixels: (6248, 4176),
}).unwrap();
let hits = rank(pointing, &catalog, Constraint::within(&field, RadiusPolicy::Circumscribed).nearest_one());
assert_eq!(hits[0].object.name, "M 31");Re-exports§
pub use error::Error;pub use error::Result;pub use matcher::is_framed;pub use matcher::rank;pub use matcher::Constraint;pub use matcher::Match;pub use matcher::Matcher;pub use matcher::Membership;pub use matcher::Offset;pub use matcher::Query;pub use matcher::SkyObject;pub use optics::Field;pub use optics::Optics;pub use optics::RadiusPolicy;pub use optics::ARCSEC_PER_DEGREE;pub use optics::ARCSEC_PER_RADIAN;pub use optics::DEFAULT_FALLBACK_RADIUS;pub use skymath;