{"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":"2026-09-04T13:27:29.958Z","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-23577","name":"HIP 23577","class":"f8_yellow_white_star","category":"star","object_type":"F8 yellow-white star","mag":9.19,"mag_band":"V","abs_mag":4.233,"abs_mag_band":"V","distance_ly":319.7611034624735,"distance_method":"parallax","ra_deg":76.042155,"dec_deg":85.258847,"epoch_ra_deg":78.14713,"epoch_dec_deg":85.293025,"epoch_moved_arcsec":5.32,"pm_ra_mas_yr":41.26,"pm_dec_mas_yr":-195.12,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Cepheus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hip-23577","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"age_years":5105350500,"mass_solar":1.131,"radius_solar":1.357,"spectral_type":"F8","color_index_bv":0.48,"luminosity_solar":1.7652247174525577,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (quality D)","surface_gravity_log_g":4.19,"surface_temperature_k":6028,"proper_motion_ra_mas_yr":41.26,"proper_motion_dec_mas_yr":-195.12,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":2.1964},"designations":[{"catalog":"HIP","designation":"HIP 23577"}],"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."}