{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.681","julian_year":2026.681,"time":"2026-09-06T14:02:31.794Z","years_from_j2000":26.681,"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-19537","name":"HD 19537","class":"g0v_yellow_main_sequence_star","category":"star","object_type":"G0V yellow main-sequence star","mag":8.68,"mag_band":"V","abs_mag":4.528,"abs_mag_band":"V","distance_ly":220.67414359937146,"distance_method":"parallax","ra_deg":47.768985,"dec_deg":55.733102,"epoch_ra_deg":48.275942,"epoch_dec_deg":55.834214,"epoch_moved_arcsec":3.775,"pm_ra_mas_yr":113.9,"pm_dec_mas_yr":-83.97,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Perseus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-19537","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"03111+5544","age_years":6032894000,"companions":[{"measured":2020,"magnitude":10.36,"components":"AB","discoverer_code":"SCA   9","separation_arcsec":28.4,"position_angle_deg":137},{"measured":2016,"magnitude":11.59,"components":"AC","discoverer_code":"SCA   9","separation_arcsec":55.1,"position_angle_deg":243}],"mass_solar":1.029,"radius_solar":1.131,"spectral_type":"G0V","color_index_bv":0.584,"luminosity_solar":1.345240705148632,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1978A&AS...32...25R, quality D)","surface_gravity_log_g":4.267,"surface_temperature_k":5899,"proper_motion_ra_mas_yr":113.9,"proper_motion_dec_mas_yr":-83.97,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4) — low confidence: Gaia's classifier calls the source a binary, which GSP-Phot fitted as one star","bolometric_luminosity_solar":1.3914},"designations":[{"catalog":"HD","designation":"HD 19537"},{"catalog":"HIP","designation":"HIP 14796"}],"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."}