{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.671","julian_year":2026.671,"time":"2026-09-03T00:04:51.485Z","years_from_j2000":26.671,"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-73495","name":"η Pyx","class":"a0v_white_main_sequence_star","category":"star","object_type":"A0V white main-sequence star","mag":5.24,"mag_band":"V","abs_mag":0.981,"abs_mag_band":"V","distance_ly":231.80977464737649,"distance_method":"parallax","ra_deg":129.46731,"dec_deg":-26.255,"epoch_ra_deg":129.7535,"epoch_dec_deg":-26.348622,"epoch_moved_arcsec":0.705,"pm_ra_mas_yr":-23.44,"pm_dec_mas_yr":-12.23,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Pyxis","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-73495","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"08379-2615","age_years":254490600,"companions":[{"measured":2011,"magnitude":17,"components":"AC","discoverer_code":"VIG  11","separation_arcsec":2,"position_angle_deg":80},{"measured":2011,"magnitude":13,"components":"AD","discoverer_code":"VIG  11","separation_arcsec":3.2,"position_angle_deg":12},{"measured":2011,"magnitude":18,"components":"AE","discoverer_code":"VIG  11","separation_arcsec":5.3,"position_angle_deg":288},{"measured":2011,"magnitude":20,"components":"AF","discoverer_code":"VIG  11","separation_arcsec":5.6,"position_angle_deg":291},{"measured":2015,"magnitude":13,"components":"AB","discoverer_code":"RST2571","separation_arcsec":17.5,"position_angle_deg":93},{"measured":2015,"magnitude":16.8,"components":"AG","discoverer_code":"RST2571","separation_arcsec":20.8,"position_angle_deg":103}],"mass_solar":2.562,"radius_solar":2.288,"spectral_type":"A0V","color_index_bv":-0.03,"luminosity_solar":35.2858025828527,"radial_velocity_km_s":31,"spectral_type_source":"SIMBAD (1988MSS...C04....0H, quality C)","surface_gravity_log_g":3.997,"surface_temperature_k":10416,"proper_motion_ra_mas_yr":-23.44,"proper_motion_dec_mas_yr":-12.23,"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":53.5646},"designations":[{"catalog":"Bayer/Flamsteed","designation":"Eta Pyx"},{"catalog":"HD","designation":"HD 73495"},{"catalog":"HIP","designation":"HIP 42334"},{"catalog":"HR","designation":"HR 3420"}],"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."}