{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.676","julian_year":2026.676,"time":"2026-09-04T20:35:52.324Z","years_from_j2000":26.676,"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-146433","name":"HD 146433","class":"g8_k0iv_yellow_subgiant","category":"star","object_type":"G8/K0IV yellow subgiant","mag":7.07,"mag_band":"V","abs_mag":3.689,"abs_mag_band":"V","distance_ly":154.72304093040188,"distance_method":"parallax","ra_deg":244.08168,"dec_deg":-1.648134,"epoch_ra_deg":244.428804,"epoch_dec_deg":-1.714931,"epoch_moved_arcsec":3.389,"pm_ra_mas_yr":-123.82,"pm_dec_mas_yr":28.51,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Serpens","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-146433","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"16163-0139","age_years":3559410000,"companions":[{"measured":2017,"magnitude":11,"components":"AB","discoverer_code":"STF2031","separation_arcsec":20.9,"position_angle_deg":229},{"measured":2017,"magnitude":12.96,"components":"AC","discoverer_code":"STF2031","separation_arcsec":92.9,"position_angle_deg":26}],"mass_solar":1.176,"radius_solar":1.342,"spectral_type":"G8/K0IV","color_index_bv":0.521,"luminosity_solar":2.9133992225701637,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1999MSS...C05....0H, quality D)","surface_gravity_log_g":4.187,"surface_temperature_k":6205,"proper_motion_ra_mas_yr":-123.82,"proper_motion_dec_mas_yr":28.51,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4) — low confidence: Gaia's classifier calls the source a binary, which GSP-Phot fitted as one star","bolometric_luminosity_solar":2.3954},"designations":[{"catalog":"HD","designation":"HD 146433"},{"catalog":"HIP","designation":"HIP 79730"}],"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."}