{"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":"2026-09-02T12:44:03.988Z","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-68752","name":"20 Pup","class":"g4ib_ii_yellow_supergiant","category":"star","object_type":"G4Ib-II yellow supergiant","mag":4.99,"mag_band":"V","abs_mag":-2.14,"abs_mag_band":"V","distance_ly":869.750449296775,"distance_method":"parallax","ra_deg":123.333195,"dec_deg":-15.788221,"epoch_ra_deg":123.641415,"epoch_dec_deg":-15.868792,"epoch_moved_arcsec":0.316,"pm_ra_mas_yr":-11.52,"pm_dec_mas_yr":-2.85,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Puppis","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-68752","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"mass_solar":5.18,"radius_solar":40.88,"spectral_type":"G4Ib-II","uncertainties":{"metallicity_fe_h":[0.197,0.197]},"color_index_bv":1.066,"luminosity_solar":625.1726927756862,"metallicity_fe_h":-0.075,"radial_velocity_km_s":17,"spectral_type_source":"SIMBAD (1989ApJS...71..245K, quality C)","surface_gravity_log_g":1.854,"surface_temperature_k":4945,"metallicity_fe_h_source":"Median of 4 spectroscopic determinations in 4 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":-11.52,"proper_motion_dec_mas_yr":-2.85,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":1205.2765},"designations":[{"catalog":"Bayer/Flamsteed","designation":"20 Pup"},{"catalog":"HD","designation":"HD 68752"},{"catalog":"HIP","designation":"HIP 40259"},{"catalog":"HR","designation":"HR 3229"}],"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."}