{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.676","julian_year":2026.676,"time":"2026-09-05T00:31:18.563Z","years_from_j2000":26.676,"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-6456","name":"74 ψ¹ Psc A","class":"a0iv_vnn_white_subgiant","category":"star","object_type":"A0IV-Vnn white subgiant","mag":5.33,"mag_band":"V","abs_mag":0.7,"abs_mag_band":"V","distance_ly":275.00527299942655,"distance_method":"parallax","ra_deg":16.420634999999997,"dec_deg":21.473181,"epoch_ra_deg":16.781115,"epoch_dec_deg":21.617019,"epoch_moved_arcsec":1.242,"pm_ra_mas_yr":44.3,"pm_dec_mas_yr":-14.32,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Pisces","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-6456","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"01057+2128","companions":[{"measured":2022,"magnitude":6.6,"components":"Aa,Ab","discoverer_code":"YR    6","separation_arcsec":0.1,"position_angle_deg":137},{"measured":2021,"magnitude":5.45,"components":"AB","discoverer_code":"STF  88","separation_arcsec":29.8,"position_angle_deg":159},{"measured":2017,"magnitude":10.71,"components":"AC","discoverer_code":"STF  88","separation_arcsec":90.4,"position_angle_deg":124}],"spectral_type":"A0IV-Vnn","color_index_bv":0.003,"luminosity_solar":45.708818961487495,"radial_velocity_km_s":-3,"spectral_type_source":"SIMBAD (1987ApJS...65..581G, quality C)","proper_motion_ra_mas_yr":44.3,"proper_motion_dec_mas_yr":-14.32},"designations":[{"catalog":"Bayer/Flamsteed","designation":"74 Psi1 Psc"},{"catalog":"HD","designation":"HD 6456"},{"catalog":"HIP","designation":"HIP 5131"},{"catalog":"HR","designation":"HR 310"}],"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."}