{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.675","julian_year":2026.675,"time":"2026-09-04T16:51:58.064Z","years_from_j2000":26.675,"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":"hip-12147","name":"HIP 12147","class":"k0_orange_star","category":"star","object_type":"K0 orange star","mag":9.83,"mag_band":"V","abs_mag":6.141,"abs_mag_band":"V","distance_ly":178.3250210474963,"distance_method":"parallax","ra_deg":39.147015,"dec_deg":-74.109217,"epoch_ra_deg":39.171711,"epoch_dec_deg":-73.990824,"epoch_moved_arcsec":5.938,"pm_ra_mas_yr":175.18,"pm_dec_mas_yr":137.36,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Hydrus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hip-12147","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"02366-7407","companions":[{"measured":2015,"magnitude":14.5,"components":"AC","discoverer_code":"SKF1041","separation_arcsec":9.6,"position_angle_deg":234},{"measured":2015,"magnitude":12.4,"components":"AB","discoverer_code":"RSS  59","separation_arcsec":18.4,"position_angle_deg":277}],"mass_solar":0.825,"radius_solar":0.732,"spectral_type":"K0","uncertainties":{"metallicity_fe_h":[0.06,0.06]},"color_index_bv":0.876,"luminosity_solar":0.30450890669742214,"metallicity_fe_h":-0.32,"radial_velocity_km_s":0,"surface_gravity_log_g":4.558,"surface_temperature_k":4936,"metallicity_fe_h_source":"One spectroscopic determination, compiled from the literature (PASTEL, Soubiran+ 2016)","proper_motion_ra_mas_yr":175.18,"proper_motion_dec_mas_yr":137.36,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":0.2872},"designations":[{"catalog":"HIP","designation":"HIP 12147"}],"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."}