{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.682","julian_year":2026.682,"time":"2026-09-07T00:44:15.800Z","years_from_j2000":26.682,"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-121325","name":"HD 121325","class":"f7_8v_yellow_white_main_sequence_star","category":"star","object_type":"F7/8V yellow-white main-sequence star","mag":6.19,"mag_band":"V","abs_mag":3.592,"abs_mag_band":"V","distance_ly":107.89155127956558,"distance_method":"parallax","ra_deg":208.742505,"dec_deg":-8.058852,"epoch_ra_deg":209.095472,"epoch_dec_deg":-8.191151,"epoch_moved_arcsec":4.751,"pm_ra_mas_yr":-174.33,"pm_dec_mas_yr":-36.18,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Virgo","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-121325","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"13550-0804","age_years":3281450300,"companions":[{"measured":2019,"magnitude":7.26,"components":"AB","discoverer_code":"STF1788","separation_arcsec":3.7,"position_angle_deg":100},{"measured":2015,"magnitude":10.8,"components":"AC","discoverer_code":"STF1788","separation_arcsec":112.3,"position_angle_deg":298},{"measured":2015,"magnitude":11.69,"components":"AD","discoverer_code":"STF1788","separation_arcsec":143.5,"position_angle_deg":211},{"measured":2015,"magnitude":12.43,"components":"AE","discoverer_code":"TOK 570","separation_arcsec":647,"position_angle_deg":228}],"mass_solar":1.166,"radius_solar":1.291,"spectral_type":"F7/8V","color_index_bv":0.53,"luminosity_solar":3.185664236573112,"radial_velocity_km_s":-19,"spectral_type_source":"SIMBAD (1999MSS...C05....0H, quality D)","surface_gravity_log_g":4.165,"surface_temperature_k":6210,"proper_motion_ra_mas_yr":-174.33,"proper_motion_dec_mas_yr":-36.18,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":2.2231},"designations":[{"catalog":"HD","designation":"HD 121325"},{"catalog":"HIP","designation":"HIP 67953"},{"catalog":"HR","designation":"HR 5233"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-09-02T19:50:56.720Z","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."}