{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.669","julian_year":2026.669,"time":"2026-09-02T11:20:46.118Z","years_from_j2000":26.669,"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-79170","name":"HD 79170","class":"k0v_orange_dwarf","category":"star","object_type":"K0V orange dwarf","mag":9.26,"mag_band":"V","abs_mag":4.755,"abs_mag_band":"V","distance_ly":259.67853249776135,"distance_method":"parallax","ra_deg":137.70992999999999,"dec_deg":-45.3087,"epoch_ra_deg":137.94858,"epoch_dec_deg":-45.417641,"epoch_moved_arcsec":5.17,"pm_ra_mas_yr":-189.84,"pm_dec_mas_yr":39.26,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Vela","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-79170","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"09109-4519","age_years":778803100,"companions":[{"measured":2016,"magnitude":10.32,"components":null,"discoverer_code":"HJ 4186","separation_arcsec":9,"position_angle_deg":282}],"mass_solar":0.965,"radius_solar":0.862,"spectral_type":"K0V","color_index_bv":0.815,"luminosity_solar":1.0914403364487564,"radial_velocity_km_s":18.1,"spectral_type_source":"SIMBAD (1978MSS...C02....0H, quality C)","surface_gravity_log_g":4.55,"surface_temperature_k":5524,"proper_motion_ra_mas_yr":-189.84,"proper_motion_dec_mas_yr":39.26,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":0.6244},"designations":[{"catalog":"Gliese","designation":"Gl 336.2A"},{"catalog":"HD","designation":"HD 79170"},{"catalog":"HIP","designation":"HIP 45072"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-09-01T22:58:55.274Z","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."}