{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.674","julian_year":2026.674,"time":"2026-09-04T05:51:01.074Z","years_from_j2000":26.674,"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-3405","name":"HD 3405","class":"g3v_yellow_main_sequence_star","category":"star","object_type":"G3V yellow main-sequence star","mag":6.79,"mag_band":"V","abs_mag":3.589,"abs_mag_band":"V","distance_ly":142.42629317772523,"distance_method":"parallax","ra_deg":9.157739999999999,"dec_deg":-49.132323,"epoch_ra_deg":9.480878,"epoch_dec_deg":-48.985402,"epoch_moved_arcsec":10.865,"pm_ra_mas_yr":385.2,"pm_dec_mas_yr":-132.44,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Phoenix","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-3405","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"00366-4908","companions":[{"measured":2015,"magnitude":8.48,"components":null,"discoverer_code":"LDS  21","separation_arcsec":329.7,"position_angle_deg":273}],"spectral_type":"G3V","color_index_bv":0.639,"luminosity_solar":3.1944787242086905,"radial_velocity_km_s":-3,"spectral_type_source":"SIMBAD (1978PDAO...15..121B, quality C)","surface_temperature_k":5922,"proper_motion_ra_mas_yr":385.2,"proper_motion_dec_mas_yr":-132.44,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"Gliese","designation":"Gl 24A"},{"catalog":"HD","designation":"HD 3405"},{"catalog":"HIP","designation":"HIP 2888"}],"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."}