{"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":"2026-08-31T21:55:35.700Z","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-4096","name":"HD 4096","class":"g3v_yellow_main_sequence_star","category":"star","object_type":"G3V yellow main-sequence star","mag":9.24,"mag_band":"V","abs_mag":5.021,"abs_mag_band":"V","distance_ly":227.60398815671905,"distance_method":"parallax","ra_deg":10.852605,"dec_deg":-0.894669,"epoch_ra_deg":11.195352,"epoch_dec_deg":-0.749172,"epoch_moved_arcsec":6.666,"pm_ra_mas_yr":-114.53,"pm_dec_mas_yr":-222.2,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Cetus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-4096","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"00434-0054","age_years":5066001400,"companions":[{"measured":2023,"magnitude":14.2,"components":"Aa,Ab","discoverer_code":"STF  53","separation_arcsec":1.3,"position_angle_deg":337},{"measured":2015,"magnitude":10.7,"components":"AB","discoverer_code":"STF  53","separation_arcsec":51.7,"position_angle_deg":4}],"mass_solar":0.98,"radius_solar":0.983,"spectral_type":"G3V","color_index_bv":0.674,"luminosity_solar":0.8542795299048481,"radial_velocity_km_s":-50.5,"spectral_type_source":"SIMBAD (1999MSS...C05....0H, quality C)","surface_gravity_log_g":4.371,"surface_temperature_k":5706,"proper_motion_ra_mas_yr":-114.53,"proper_motion_dec_mas_yr":-222.2,"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":0.9144},"designations":[{"catalog":"HD","designation":"HD 4096"},{"catalog":"HIP","designation":"HIP 3410"}],"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."}