{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.654","julian_year":2026.654,"time":"2026-08-27T17:05:48.454Z","years_from_j2000":26.654,"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-12558","name":"10 Ari","class":"f8v_yellow_white_main_sequence_star","category":"star","object_type":"F8V yellow-white main-sequence star","mag":5.64,"mag_band":"V","abs_mag":2.202,"abs_mag_band":"V","distance_ly":158.868162334804,"distance_method":"parallax","ra_deg":30.913905,"dec_deg":25.935471,"epoch_ra_deg":31.295573,"epoch_dec_deg":26.06469,"epoch_moved_arcsec":3.358,"pm_ra_mas_yr":125.66,"pm_dec_mas_yr":9.27,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Aries","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-12558","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"02037+2556","age_years":2166310300,"companions":[{"measured":2022,"magnitude":7.87,"components":"AB","discoverer_code":"STF 208","separation_arcsec":1.5,"position_angle_deg":347},{"measured":2001,"magnitude":13.5,"components":"AB,C","discoverer_code":"STF 208","separation_arcsec":95.3,"position_angle_deg":150}],"mass_solar":1.613,"radius_solar":3.051,"spectral_type":"F8V","color_index_bv":0.537,"luminosity_solar":11.460405911366024,"radial_velocity_km_s":16,"spectral_type_source":"SIMBAD (1976PASP...88...95C, quality C)","surface_gravity_log_g":3.578,"surface_temperature_k":6001,"proper_motion_ra_mas_yr":125.66,"proper_motion_dec_mas_yr":9.27,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":10.6313},"designations":[{"catalog":"Bayer/Flamsteed","designation":"10 Ari"},{"catalog":"HD","designation":"HD 12558"},{"catalog":"HIP","designation":"HIP 9621"},{"catalog":"HR","designation":"HR 605"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-08-27T16:03:54.983Z","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."}