{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.669","julian_year":2026.669,"time":"2026-09-02T04:17:23.248Z","years_from_j2000":26.669,"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-150682","name":"39 Her","class":"f3v_f3v_yellow_white_main_sequence_star","category":"star","object_type":"F3V:+F3V: yellow-white main-sequence star","mag":5.92,"mag_band":"V","abs_mag":2.715,"abs_mag_band":"V","distance_ly":142.67547665030082,"distance_method":"parallax","ra_deg":250.402905,"dec_deg":26.91688,"epoch_ra_deg":250.675835,"epoch_dec_deg":26.864574,"epoch_moved_arcsec":1.196,"pm_ra_mas_yr":0.89,"pm_dec_mas_yr":-44.83,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Hercules","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-150682","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"16416+2655","age_years":2076940500,"companions":[{"measured":1987,"magnitude":null,"components":null,"discoverer_code":"CHR  57","separation_arcsec":0.4,"position_angle_deg":50}],"mass_solar":1.474,"radius_solar":1.971,"spectral_type":"F3V:+F3V:","color_index_bv":0.402,"luminosity_solar":7.144963260755133,"radial_velocity_km_s":-12,"spectral_type_source":"SIMBAD (1969ApJ...158.1091A, quality C)","surface_gravity_log_g":3.989,"surface_temperature_k":6582,"proper_motion_ra_mas_yr":0.89,"proper_motion_dec_mas_yr":-44.83,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":6.5581},"designations":[{"catalog":"Bayer/Flamsteed","designation":"39 Her"},{"catalog":"HD","designation":"HD 150682"},{"catalog":"HIP","designation":"HIP 81729"},{"catalog":"HR","designation":"HR 6213"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-09-01T22:58:55.274Z","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."}