{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.798","julian_year":2026.798,"time":"2026-10-19T12:43:36.732Z","years_from_j2000":26.798,"frame":"date","applied":"Proper motion, then precession and nutation. The catalogued position is carried along the great circle the object's own published motion puts it on, at a constant velocity, from the epoch that position was measured at, 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. The motion runs from position_epoch_jyear where the upstream publishes one — a timed pulsar's position belongs to the year it was timed — and from J2000 where it does not. 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-178079","name":"HD 178079","class":"f_g_a_f_yellow_white_star","category":"star","object_type":"F/G+A/F yellow-white star","mag":8.11,"mag_band":"V","abs_mag":1.443,"abs_mag_band":"V","distance_ly":702.9230928765494,"distance_method":"parallax","ra_deg":287.186775,"dec_deg":-33.794271,"epoch_ra_deg":287.628675,"epoch_dec_deg":-33.752168,"epoch_moved_arcsec":2.582,"pm_ra_mas_yr":24.72,"pm_dec_mas_yr":-93.11,"position_epoch_jyear":null,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Sagittarius","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-178079","source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0","attribution":"HYG Database v4.1, Astronexus (github.com/astronexus/HYG-Database). Fields derived from it stay under CC BY-SA 4.0.","commercial_use":"allowed"},"radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"19087-3348","age_years":2105831000,"companions":[{"measured":2016,"magnitude":9.04,"components":"AB","discoverer_code":"COO 233","separation_arcsec":12,"position_angle_deg":256},{"measured":2015,"magnitude":16,"components":"AD","discoverer_code":"UC 3816","separation_arcsec":58.4,"position_angle_deg":91}],"mass_solar":1.443,"radius_solar":1.858,"spectral_type":"F/G+A/F","color_index_bv":0.432,"luminosity_solar":23.056851369472863,"variable_mag_max":8.05,"variable_mag_min":8.28,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1982MSS...C03....0H, quality E)","surface_gravity_log_g":4.012,"surface_temperature_k":6599,"proper_motion_ra_mas_yr":24.72,"proper_motion_dec_mas_yr":-93.11,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":5.9181},"designations":[{"catalog":"HD","designation":"HD 178079"},{"catalog":"HIP","designation":"HIP 94042"}],"updated_at":"2026-10-01T09:42:28.932Z","attribution":"Data from SpaceCatalog.org. Each record names its upstream in `source`, with that producer's terms in `source.license`, the acknowledgement it asks for in `source.attribution`, and whether its terms allow commercial use in `source.commercial_use`; those terms govern the record, and citing SpaceCatalog does not discharge them."}