{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.672","julian_year":2026.672,"time":"2026-09-03T10:43:15.997Z","years_from_j2000":26.672,"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-19961","name":"HD 19961","class":"g0iv_yellow_subgiant","category":"star","object_type":"G0IV yellow subgiant","mag":8.57,"mag_band":"V","abs_mag":3.916,"abs_mag_band":"V","distance_ly":278.0532043491895,"distance_method":"parallax","ra_deg":48.729240000000004,"dec_deg":56.304793,"epoch_ra_deg":49.240931,"epoch_dec_deg":56.404219,"epoch_moved_arcsec":1.705,"pm_ra_mas_yr":32.22,"pm_dec_mas_yr":-55.23,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Perseus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-19961","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"age_years":7166306000,"mass_solar":1.118,"radius_solar":1.812,"spectral_type":"G0IV","color_index_bv":0.696,"luminosity_solar":2.3637416081162934,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1978A&AS...32...25R, quality D)","surface_gravity_log_g":3.982,"surface_temperature_k":5742,"proper_motion_ra_mas_yr":32.22,"proper_motion_dec_mas_yr":-55.23,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":3.2136},"designations":[{"catalog":"HD","designation":"HD 19961"},{"catalog":"HIP","designation":"HIP 15111"}],"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."}