{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.665","julian_year":2026.665,"time":"2026-08-31T21:56:34.649Z","years_from_j2000":26.665,"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-3787","name":"HD 3787","class":"a3ma4_f0_white_star","category":"star","object_type":"A3mA4-F0 white star","mag":9.94,"mag_band":"V","abs_mag":2.015,"abs_mag_band":"V","distance_ly":1254.4476567807637,"distance_method":"parallax","ra_deg":9.88413,"dec_deg":-69.724681,"epoch_ra_deg":10.164261,"epoch_dec_deg":-69.577125,"epoch_moved_arcsec":0.193,"pm_ra_mas_yr":6.54,"pm_dec_mas_yr":-3.11,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Tucana","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-3787","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"age_years":545136450,"mass_solar":2.433,"radius_solar":3.344,"spectral_type":"A3mA4-F0","color_index_bv":0.246,"luminosity_solar":13.614446824659497,"variable_mag_max":9.875,"variable_mag_min":9.985,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1975MSS...C01....0H, quality C)","surface_gravity_log_g":3.802,"surface_temperature_k":8736,"proper_motion_ra_mas_yr":6.54,"proper_motion_dec_mas_yr":-3.11,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4) — low confidence: above 7,500 K GSP-Phot's temperature and extinction are degenerate","bolometric_luminosity_solar":54.7697},"designations":[{"catalog":"HD","designation":"HD 3787"},{"catalog":"HIP","designation":"HIP 3103"}],"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."}