{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.684","julian_year":2026.684,"time":"2026-09-07T22:41:19.096Z","years_from_j2000":26.684,"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-204608","name":"HD 204608","class":"k0iii_orange_giant","category":"star","object_type":"K0III orange giant","mag":8.4,"mag_band":"V","abs_mag":1.2,"abs_mag_band":"V","distance_ly":898.5024386180169,"distance_method":"parallax","ra_deg":322.59812999999997,"dec_deg":-24.427459,"epoch_ra_deg":322.984296,"epoch_dec_deg":-24.309787,"epoch_moved_arcsec":0.378,"pm_ra_mas_yr":10.49,"pm_dec_mas_yr":-9.5,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Capricornus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-204608","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"21304-2426","age_years":621975540,"companions":[{"measured":1991,"magnitude":10.55,"components":"AB","discoverer_code":"SEE 448","separation_arcsec":1.5,"position_angle_deg":254},{"measured":2015,"magnitude":15,"components":"AC","discoverer_code":"I  9028","separation_arcsec":23.7,"position_angle_deg":10}],"mass_solar":2.501,"radius_solar":9.794,"spectral_type":"K0III","color_index_bv":1.6,"luminosity_solar":28.84031503126606,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1988MSS...C04....0H, quality C)","surface_gravity_log_g":2.742,"surface_temperature_k":5007,"proper_motion_ra_mas_yr":10.49,"proper_motion_dec_mas_yr":-9.5,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":54.8654},"designations":[{"catalog":"HD","designation":"HD 204608"},{"catalog":"HIP","designation":"HIP 106181"}],"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."}