{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.686","julian_year":2026.686,"time":"2026-09-08T16:19:15.945Z","years_from_j2000":26.686,"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-117028","name":"HD 117028","class":"g9iii_iv_yellow_giant","category":"star","object_type":"G9III-IV yellow giant","mag":8.24,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":null,"distance_method":null,"ra_deg":201.795195,"dec_deg":28.874296,"epoch_ra_deg":202.109687,"epoch_dec_deg":28.734751,"epoch_moved_arcsec":0.797,"pm_ra_mas_yr":-28.16,"pm_dec_mas_yr":9.9,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Canes Venatici","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-117028","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"age_years":455150300,"mass_solar":2.801,"radius_solar":10.096,"spectral_type":"G9III-IV","color_index_bv":0.96,"radial_velocity_km_s":26.3,"spectral_type_source":"SIMBAD (1997JApA...18..161Y, quality C)","surface_gravity_log_g":2.796,"surface_temperature_k":5102,"proper_motion_ra_mas_yr":-28.16,"proper_motion_dec_mas_yr":9.9,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":63.7216},"designations":[{"catalog":"HD","designation":"HD 117028"},{"catalog":"HIP","designation":"HIP 65615"}],"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."}