{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.670","julian_year":2026.67,"time":"2026-09-02T12:56:44.156Z","years_from_j2000":26.67,"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-41757","name":"HD 41757","class":"apcreu_white_star","category":"star","object_type":"ApCrEu white star","mag":8.5,"mag_band":"V","abs_mag":-1.333,"abs_mag_band":"V","distance_ly":3019.966375781156,"distance_method":"parallax","ra_deg":91.507545,"dec_deg":-24.922057,"epoch_ra_deg":91.782092,"epoch_dec_deg":-24.924066,"epoch_moved_arcsec":0.083,"pm_ra_mas_yr":-0.74,"pm_dec_mas_yr":-3.04,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Lepus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-41757","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"age_years":316026000,"mass_solar":3.118,"radius_solar":4.169,"spectral_type":"ApCrEu","color_index_bv":0,"luminosity_solar":297.3034849677023,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1973AJ.....78..687B, quality D)","surface_gravity_log_g":3.6,"surface_temperature_k":9988,"proper_motion_ra_mas_yr":-0.74,"proper_motion_dec_mas_yr":-3.04,"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":166.6563},"designations":[{"catalog":"HD","designation":"HD 41757"},{"catalog":"HIP","designation":"HIP 28896"}],"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."}