{"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":"2026-08-31T22:24:33.865Z","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-27752","name":"HD 27752","class":"a2iv_white_subgiant","category":"star","object_type":"A2IV white subgiant","mag":8.16,"mag_band":"V","abs_mag":1.748,"abs_mag_band":"V","distance_ly":624.8207081993648,"distance_method":"parallax","ra_deg":65.677065,"dec_deg":-2.244216,"epoch_ra_deg":66.015742,"epoch_dec_deg":-2.181033,"epoch_moved_arcsec":0.397,"pm_ra_mas_yr":-8.67,"pm_dec_mas_yr":-12.12,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Eridanus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-27752","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"mass_solar":1.805,"radius_solar":1.491,"spectral_type":"A2IV","color_index_bv":0.207,"luminosity_solar":17.41004926352607,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1999MSS...C05....0H, quality C)","surface_gravity_log_g":4.319,"surface_temperature_k":8535,"proper_motion_ra_mas_yr":-8.67,"proper_motion_dec_mas_yr":-12.12,"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":11.2659},"designations":[{"catalog":"HD","designation":"HD 27752"},{"catalog":"HIP","designation":"HIP 20438"}],"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."}