{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.788","julian_year":2026.788,"time":"2026-10-15T17:38:29.698Z","years_from_j2000":26.788,"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-167","name":"HD 167","class":"g9iii_yellow_giant","category":"star","object_type":"G9III yellow giant","mag":6.68,"mag_band":"V","abs_mag":0.631,"abs_mag_band":"V","distance_ly":528.616644558901,"distance_method":"parallax","ra_deg":1.64808,"dec_deg":28.553404,"epoch_ra_deg":1.99466,"epoch_dec_deg":28.703311,"epoch_moved_arcsec":0.425,"pm_ra_mas_yr":-8.29,"pm_dec_mas_yr":-13.54,"position_epoch_jyear":null,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Pegasus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-167","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":{"age_years":270442660,"mass_solar":3.401,"radius_solar":14.651,"spectral_type":"G9III","color_index_bv":0.986,"luminosity_solar":48.70796664925366,"radial_velocity_km_s":4.4,"spectral_type_source":"SIMBAD (quality C)","surface_gravity_log_g":2.56,"surface_temperature_k":5047,"proper_motion_ra_mas_yr":-8.29,"proper_motion_dec_mas_yr":-13.54,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":127.0072},"designations":[{"catalog":"HD","designation":"HD 167"},{"catalog":"HIP","designation":"HIP 540"}],"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."}