{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.666","julian_year":2026.666,"time":"2026-09-01T05:04:57.129Z","years_from_j2000":26.666,"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-213612","name":"HD 213612","class":"g8v_yellow_main_sequence_star","category":"star","object_type":"G8V yellow main-sequence star","mag":7.57,"mag_band":"V","abs_mag":3.274,"abs_mag_band":"V","distance_ly":235.8325874101348,"distance_method":"parallax","ra_deg":338.255745,"dec_deg":-17.501484,"epoch_ra_deg":338.616178,"epoch_dec_deg":-17.363641,"epoch_moved_arcsec":5.17,"pm_ra_mas_yr":-189.54,"pm_dec_mas_yr":-40.79,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Aquarius","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-213612","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"age_years":3781404500,"mass_solar":1.341,"radius_solar":2.53,"spectral_type":"G8V","uncertainties":{"metallicity_fe_h":[0.06,0.06]},"color_index_bv":0.827,"luminosity_solar":4.269725940480335,"metallicity_fe_h":-0.26,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1988MSS...C04....0H, quality C)","surface_gravity_log_g":3.93,"surface_temperature_k":5602,"metallicity_fe_h_source":"One spectroscopic determination, compiled from the literature (PASTEL, Soubiran+ 2016)","proper_motion_ra_mas_yr":-189.54,"proper_motion_dec_mas_yr":-40.79,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":5.5121},"designations":[{"catalog":"HD","designation":"HD 213612"},{"catalog":"HIP","designation":"HIP 111312"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-08-30T09:56:50.739Z","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."}