{"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":"2026-09-02T04:38:11.852Z","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-101198","name":"24 ι Crt","class":"f6_5v_yellow_white_main_sequence_star","category":"star","object_type":"F6.5V yellow-white main-sequence star","mag":5.48,"mag_band":"V","abs_mag":3.345,"abs_mag_band":"V","distance_ly":87.18420901470725,"distance_method":"parallax","ra_deg":174.666735,"dec_deg":-13.201943,"epoch_ra_deg":175.007779,"epoch_dec_deg":-13.349663,"epoch_moved_arcsec":4.287,"pm_ra_mas_yr":99.62,"pm_dec_mas_yr":126.17,"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-101198","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"11387-1312","age_years":5100585000,"companions":[{"measured":2014,"magnitude":11,"components":"AB","discoverer_code":"KUI  58","separation_arcsec":1.1,"position_angle_deg":248},{"measured":2015,"magnitude":16.5,"components":"AC","discoverer_code":"UC 2181","separation_arcsec":92.2,"position_angle_deg":174}],"mass_solar":1.202,"radius_solar":1.821,"spectral_type":"F6.5V","uncertainties":{"metallicity_fe_h":[0.062,0.062]},"color_index_bv":0.52,"luminosity_solar":3.9994474976109746,"metallicity_fe_h":-0.24,"radial_velocity_km_s":-23.8,"spectral_type_source":"SIMBAD (2006AJ....132..161G, quality C)","surface_gravity_log_g":4.028,"surface_temperature_k":6042,"metallicity_fe_h_source":"Median of 3 spectroscopic determinations in 4 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":99.62,"proper_motion_dec_mas_yr":126.17,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":3.9635},"designations":[{"catalog":"Bayer/Flamsteed","designation":"24 Iota Crt"},{"catalog":"Gliese","designation":"GJ 3677A"},{"catalog":"HD","designation":"HD 101198"},{"catalog":"HIP","designation":"HIP 56802"},{"catalog":"HR","designation":"HR 4488"}],"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."}