{"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":"2026-09-02T09:22:58.961Z","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-3074","name":"HD 3074","class":"f8_g0v_yellow_white_main_sequence_star","category":"star","object_type":"F8/G0V yellow-white main-sequence star","mag":6.41,"mag_band":"V","abs_mag":3.81,"abs_mag_band":"V","distance_ly":107.99885672783438,"distance_method":"parallax","ra_deg":8.432549999999999,"dec_deg":-35.002078,"epoch_ra_deg":8.761999,"epoch_dec_deg":-34.857769,"epoch_moved_arcsec":13.876,"pm_ra_mas_yr":-60.33,"pm_dec_mas_yr":-516.78,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Sculptor","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-3074","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"00337-3500","age_years":7260863300,"companions":[{"measured":2016,"magnitude":8.46,"components":null,"discoverer_code":"HJ 3375","separation_arcsec":4.4,"position_angle_deg":171}],"mass_solar":1.072,"radius_solar":1.417,"spectral_type":"F8/G0V","uncertainties":{"metallicity_fe_h":[0.03,0.03]},"color_index_bv":0.617,"luminosity_solar":2.606153549998895,"metallicity_fe_h":0,"radial_velocity_km_s":28.2,"spectral_type_source":"SIMBAD (1982MSS...C03....0H, quality D)","surface_gravity_log_g":4.205,"surface_temperature_k":5941,"metallicity_fe_h_source":"One spectroscopic determination, compiled from the literature (PASTEL, Soubiran+ 2016)","proper_motion_ra_mas_yr":-60.33,"proper_motion_dec_mas_yr":-516.78,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":2.2483},"designations":[{"catalog":"HD","designation":"HD 3074"},{"catalog":"HIP","designation":"HIP 2663"}],"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."}