{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.686","julian_year":2026.686,"time":"2026-09-08T12:47:55.514Z","years_from_j2000":26.686,"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":"hip-52938","name":"HIP 52938","class":"g5_yellow_star","category":"star","object_type":"G5 yellow star","mag":9.57,"mag_band":"V","abs_mag":1.202,"abs_mag_band":"V","distance_ly":1538.473436718702,"distance_method":"parallax","ra_deg":162.39228,"dec_deg":16.506668,"epoch_ra_deg":162.750296,"epoch_dec_deg":16.36457,"epoch_moved_arcsec":0.559,"pm_ra_mas_yr":-19.22,"pm_dec_mas_yr":-8.33,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Leo","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hip-52938","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"10496+1630","age_years":947959240,"companions":[{"measured":2017,"magnitude":10.87,"components":null,"discoverer_code":"A  2370","separation_arcsec":2.7,"position_angle_deg":335}],"mass_solar":2.154,"radius_solar":6.812,"spectral_type":"G5","color_index_bv":1,"luminosity_solar":28.787238108352508,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (quality D)","surface_gravity_log_g":2.74,"surface_temperature_k":4764,"proper_motion_ra_mas_yr":-19.22,"proper_motion_dec_mas_yr":-8.33,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":18.8481},"designations":[{"catalog":"HIP","designation":"HIP 52938"}],"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."}