{"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":"2026-09-03T13:03:54.536Z","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-196674","name":"HD 196674","class":"f7iv_yellow_white_subgiant","category":"star","object_type":"F7IV yellow-white subgiant","mag":7.8,"mag_band":"V","abs_mag":0.864,"abs_mag_band":"V","distance_ly":795.5032330042023,"distance_method":"parallax","ra_deg":309.51699,"dec_deg":27.078877,"epoch_ra_deg":309.801645,"epoch_dec_deg":27.172639,"epoch_moved_arcsec":1.089,"pm_ra_mas_yr":37.44,"pm_dec_mas_yr":16.33,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Vulpecula","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-196674","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"age_years":739153740,"mass_solar":2.333,"radius_solar":5.93,"spectral_type":"F7IV","color_index_bv":0.579,"luminosity_solar":39.30067413418532,"radial_velocity_km_s":-56,"spectral_type_source":"SIMBAD (quality C)","surface_gravity_log_g":3.148,"surface_temperature_k":5921,"proper_motion_ra_mas_yr":37.44,"proper_motion_dec_mas_yr":16.33,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":37.2794},"designations":[{"catalog":"HD","designation":"HD 196674"},{"catalog":"HIP","designation":"HIP 101821"}],"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."}