{"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":"2026-09-02T06:07:16.866Z","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-213617","name":"39 Peg","class":"f1v_yellow_white_main_sequence_star","category":"star","object_type":"F1V yellow-white main-sequence star","mag":6.43,"mag_band":"V","abs_mag":2.924,"abs_mag_band":"V","distance_ly":163.8978198355739,"distance_method":"parallax","ra_deg":338.147805,"dec_deg":20.230019,"epoch_ra_deg":338.471897,"epoch_dec_deg":20.36828,"epoch_moved_arcsec":4.519,"pm_ra_mas_yr":166.66,"pm_dec_mas_yr":30.52,"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-213617","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"22326+2014","age_years":1331797400,"companions":[{"measured":2015,"magnitude":12.6,"components":null,"discoverer_code":"LBU  21","separation_arcsec":53.9,"position_angle_deg":314}],"mass_solar":1.5,"radius_solar":1.702,"spectral_type":"F1V","color_index_bv":0.35,"luminosity_solar":5.893862502405809,"radial_velocity_km_s":-19,"spectral_type_source":"SIMBAD (quality C)","surface_gravity_log_g":4.082,"surface_temperature_k":7029,"proper_motion_ra_mas_yr":166.66,"proper_motion_dec_mas_yr":30.52,"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":6.3524},"designations":[{"catalog":"Bayer/Flamsteed","designation":"39 Peg"},{"catalog":"HD","designation":"HD 213617"},{"catalog":"HIP","designation":"HIP 111278"},{"catalog":"HR","designation":"HR 8586"}],"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."}