{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.683","julian_year":2026.683,"time":"2026-09-07T13:30:13.447Z","years_from_j2000":26.683,"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-147971","name":"ε Nor","class":"b2v_blue_white_main_sequence_star","category":"star","object_type":"B2V blue-white main-sequence star","mag":4.46,"mag_band":"V","abs_mag":-1.596,"abs_mag_band":"V","distance_ly":530.3354886694682,"distance_method":"parallax","ra_deg":246.796005,"dec_deg":-47.554786,"epoch_ra_deg":247.289889,"epoch_dec_deg":-47.615401,"epoch_moved_arcsec":0.661,"pm_ra_mas_yr":-13.72,"pm_dec_mas_yr":-20.63,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Norma","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-147971","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"16272-4733","companions":[{"measured":2016,"magnitude":6.12,"components":null,"discoverer_code":"HJ 4853","separation_arcsec":22.9,"position_angle_deg":334}],"spectral_type":"B2V","color_index_bv":-0.07,"luminosity_solar":378.7913037851569,"radial_velocity_km_s":-12,"spectral_type_source":"SIMBAD (1978MSS...C02....0H, quality C)","proper_motion_ra_mas_yr":-13.72,"proper_motion_dec_mas_yr":-20.63},"designations":[{"catalog":"Bayer/Flamsteed","designation":"Epsilon Nor"},{"catalog":"HD","designation":"HD 147971"},{"catalog":"HIP","designation":"HIP 80582"},{"catalog":"HR","designation":"HR 6115"}],"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."}