{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.684","julian_year":2026.684,"time":"2026-09-07T17:00:17.738Z","years_from_j2000":26.684,"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-128750","name":"HD 128750","class":"k2iii_orange_giant","category":"star","object_type":"K2III: orange giant","mag":5.9,"mag_band":"V","abs_mag":0.922,"abs_mag_band":"V","distance_ly":322.92710342096996,"distance_method":"parallax","ra_deg":219.558285,"dec_deg":18.298379,"epoch_ra_deg":219.871408,"epoch_dec_deg":18.181364,"epoch_moved_arcsec":1.888,"pm_ra_mas_yr":-29.1,"pm_dec_mas_yr":-64.51,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Boötes","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-128750","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"age_years":345597100,"mass_solar":3.102,"radius_solar":11.575,"spectral_type":"K2III:","color_index_bv":1.099,"luminosity_solar":37.25632384666037,"radial_velocity_km_s":-14.4,"spectral_type_source":"SIMBAD (quality D)","surface_gravity_log_g":2.728,"surface_temperature_k":5126,"proper_motion_ra_mas_yr":-29.1,"proper_motion_dec_mas_yr":-64.51,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":65.6265},"designations":[{"catalog":"Gliese","designation":"GJ 3862"},{"catalog":"HD","designation":"HD 128750"},{"catalog":"HIP","designation":"HIP 71571"},{"catalog":"HR","designation":"HR 5462"}],"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."}