{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.663","julian_year":2026.663,"time":"2026-08-31T03:55:07.137Z","years_from_j2000":26.663,"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-75615","name":"HD 75615","class":"f8_yellow_white_star","category":"star","object_type":"F8 yellow-white star","mag":8.02,"mag_band":"V","abs_mag":2.985,"abs_mag_band":"V","distance_ly":331.4596804184177,"distance_method":"parallax","ra_deg":133.43883,"dec_deg":58.882482,"epoch_ra_deg":133.963687,"epoch_dec_deg":58.780458,"epoch_moved_arcsec":1.773,"pm_ra_mas_yr":-27.4,"pm_dec_mas_yr":-60.59,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Ursa Major","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-75615","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"08538+5853","age_years":3394637000,"companions":[{"measured":2016,"magnitude":14.4,"components":null,"discoverer_code":"UC 1726","separation_arcsec":25.9,"position_angle_deg":289}],"mass_solar":1.389,"radius_solar":2.485,"spectral_type":"F8","color_index_bv":0.642,"luminosity_solar":5.5718574893192985,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1993yCat.3135....0C, quality E)","surface_gravity_log_g":3.883,"surface_temperature_k":5980,"proper_motion_ra_mas_yr":-27.4,"proper_motion_dec_mas_yr":-60.59,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":6.521},"designations":[{"catalog":"HD","designation":"HD 75615"},{"catalog":"HIP","designation":"HIP 43665"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-08-30T09:56:50.739Z","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."}