{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.673","julian_year":2026.673,"time":"2026-09-03T16:53:22.885Z","years_from_j2000":26.673,"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-47220","name":"HD 47220","class":"k0ii_iii_orange_bright_giant","category":"star","object_type":"K0II/III orange bright giant","mag":6.17,"mag_band":"V","abs_mag":0.507,"abs_mag_band":"V","distance_ly":442.54593341771874,"distance_method":"parallax","ra_deg":99.41802,"dec_deg":2.704158,"epoch_ra_deg":99.768737,"epoch_dec_deg":2.68114,"epoch_moved_arcsec":1.686,"pm_ra_mas_yr":-39.41,"pm_dec_mas_yr":-49.44,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Monoceros","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-47220","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"age_years":345770780,"mass_solar":3.097,"radius_solar":13.34,"spectral_type":"K0II/III","color_index_bv":1.08,"luminosity_solar":54.60092497542736,"radial_velocity_km_s":-8,"spectral_type_source":"SIMBAD (1999MSS...C05....0H, quality D)","surface_gravity_log_g":2.647,"surface_temperature_k":5173,"proper_motion_ra_mas_yr":-39.41,"proper_motion_dec_mas_yr":-49.44,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":103.1119},"designations":[{"catalog":"HD","designation":"HD 47220"},{"catalog":"HIP","designation":"HIP 31672"},{"catalog":"HR","designation":"HR 2430"}],"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."}