{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.674","julian_year":2026.674,"time":"2026-09-04T02:26:21.587Z","years_from_j2000":26.674,"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-227704","name":"HD 227704","class":"b0iii_blue_white_giant","category":"star","object_type":"B0III blue-white giant","mag":8.59,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":null,"distance_method":null,"ra_deg":301.67087999999995,"dec_deg":34.911182,"epoch_ra_deg":301.925298,"epoch_dec_deg":34.987948,"epoch_moved_arcsec":0.229,"pm_ra_mas_yr":-1.29,"pm_dec_mas_yr":-8.47,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Cygnus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-227704","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"20067+3455","companions":[{"measured":2014,"magnitude":11.19,"components":null,"discoverer_code":"A   278","separation_arcsec":1.7,"position_angle_deg":295}],"spectral_type":"B0III","color_index_bv":0.308,"radial_velocity_km_s":-7,"spectral_type_source":"SIMBAD (1951ApJ...114..492R, quality C)","proper_motion_ra_mas_yr":-1.29,"proper_motion_dec_mas_yr":-8.47},"designations":[{"catalog":"HD","designation":"HD 227704"},{"catalog":"HIP","designation":"HIP 99061"}],"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."}