{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.669","julian_year":2026.669,"time":"2026-09-02T07:53:01.682Z","years_from_j2000":26.669,"frame":"date","applied":"Proper motion, then precession and nutation. The catalogued J2000 position is carried along the great circle the object's own published motion puts it on, at a constant velocity, and the result is referred to the true equator and equinox of this instant. Those are separate things: the motion moves the object, and the rotation turns the grid under it by about fifty arcseconds a year, with nutation adding up to another seventeen.","excluded":"Parallax, the radial-velocity perspective term, aberration and refraction; each is below the accuracy of the catalogued positions themselves. An object with no published proper motion comes back where the catalogue has it rather than at a fabricated zero, and says so with a null pm_ra_mas_yr. A body with no fixed position is not propagated at all — its place comes from an ephemeris, which is what /api/v1/visible answers with."},"slug":"hd-98430","name":"12 δ Crt","class":"g9iiich0_5_yellow_giant","category":"star","object_type":"G9IIICH0.5 yellow giant","mag":3.56,"mag_band":"V","abs_mag":-0.217,"abs_mag_band":"V","distance_ly":185.73822935662017,"distance_method":"parallax","ra_deg":169.835205,"dec_deg":-14.778541,"epoch_ra_deg":170.170774,"epoch_dec_deg":-14.923811,"epoch_moved_arcsec":6.433,"pm_ra_mas_yr":-124.47,"pm_dec_mas_yr":206.61,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Crater","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-98430","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"spectral_type":"G9IIICH0.5","uncertainties":{"metallicity_fe_h":[0.073,0.073]},"color_index_bv":1.112,"luminosity_solar":106.36530750764376,"metallicity_fe_h":-0.455,"radial_velocity_km_s":-5,"spectral_type_source":"SIMBAD (1989ApJS...71..245K, quality C)","surface_gravity_log_g":2.42,"surface_temperature_k":4510,"metallicity_fe_h_source":"Median of 4 spectroscopic determinations in 7 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":-124.47,"proper_motion_dec_mas_yr":206.61,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"Bayer/Flamsteed","designation":"12 Delta Crt"},{"catalog":"HD","designation":"HD 98430"},{"catalog":"HIP","designation":"HIP 55282"},{"catalog":"HR","designation":"HR 4382"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-09-01T22:58:55.274Z","attribution":"Data from SpaceCatalog.org. Individual records carry their source and license in `source`; attribution is required for CC-BY and CC-BY-SA rows."}