{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.685","julian_year":2026.685,"time":"2026-09-08T01:08:46.673Z","years_from_j2000":26.685,"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-12961","name":"HD 12961","class":"a5_8_m_f0_f3_white_star","category":"star","object_type":"A5/8(m)F0-F3 white star","mag":9.77,"mag_band":"V","abs_mag":0.973,"abs_mag_band":"V","distance_ly":1874.4617984417166,"distance_method":"parallax","ra_deg":31.455345,"dec_deg":-41.928314,"epoch_ra_deg":31.731162,"epoch_dec_deg":-41.799609,"epoch_moved_arcsec":0.279,"pm_ra_mas_yr":0.41,"pm_dec_mas_yr":10.45,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Phoenix","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-12961","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"spectral_type":"A5/8(m)F0-F3","color_index_bv":0.302,"luminosity_solar":35.546758199906975,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1978MSS...C02....0H, quality E)","proper_motion_ra_mas_yr":0.41,"proper_motion_dec_mas_yr":10.45},"designations":[{"catalog":"HD","designation":"HD 12961"},{"catalog":"HIP","designation":"HIP 9787"}],"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."}