{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.682","julian_year":2026.682,"time":"2026-09-06T23:47:06.418Z","years_from_j2000":26.682,"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-42078","name":"π¹ Col","class":"a2ma5_a9_white_star","category":"star","object_type":"A2mA5-A9 white star","mag":6.15,"mag_band":"V","abs_mag":1.544,"abs_mag_band":"V","distance_ly":272.0235513943401,"distance_method":"parallax","ra_deg":91.67103,"dec_deg":-42.298804,"epoch_ra_deg":91.878817,"epoch_dec_deg":-42.301163,"epoch_moved_arcsec":0.929,"pm_ra_mas_yr":-34.68,"pm_dec_mas_yr":-2.92,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Columba","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-42078","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"spectral_type":"A2mA5-A9","color_index_bv":0.246,"luminosity_solar":21.00873969240991,"radial_velocity_km_s":2,"spectral_type_source":"SIMBAD (1978MSS...C02....0H, quality C)","surface_temperature_k":7564,"proper_motion_ra_mas_yr":-34.68,"proper_motion_dec_mas_yr":-2.92,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"Bayer/Flamsteed","designation":"Pi1 Col"},{"catalog":"HD","designation":"HD 42078"},{"catalog":"HIP","designation":"HIP 28957"},{"catalog":"HR","designation":"HR 2171"}],"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."}