{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.687","julian_year":2026.687,"time":"2026-09-08T21:54:56.321Z","years_from_j2000":26.687,"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-222574","name":"104 Aqr","class":"g2ib_ii_yellow_supergiant","category":"star","object_type":"G2Ib/II yellow supergiant","mag":4.82,"mag_band":"V","abs_mag":-2.23,"abs_mag_band":"V","distance_ly":838.4482432581659,"distance_method":"parallax","ra_deg":355.440855,"dec_deg":-17.816533,"epoch_ra_deg":355.78967,"epoch_dec_deg":-17.667545,"epoch_moved_arcsec":0.372,"pm_ra_mas_yr":13.93,"pm_dec_mas_yr":0.11,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Aquarius","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-222574","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"23418-1749","companions":[{"measured":2012,"magnitude":8.56,"components":"AB","discoverer_code":"HJ 5413","separation_arcsec":118,"position_angle_deg":4}],"spectral_type":"G2Ib/II","uncertainties":{"metallicity_fe_h":[0.084,0.084]},"color_index_bv":0.822,"luminosity_solar":679.203632617185,"metallicity_fe_h":0.05,"radial_velocity_km_s":3,"spectral_type_source":"SIMBAD (1988MSS...C04....0H, quality C)","surface_gravity_log_g":1.99,"surface_temperature_k":5523,"metallicity_fe_h_source":"Median of 3 spectroscopic determinations in 3 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":13.93,"proper_motion_dec_mas_yr":0.11,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"Bayer/Flamsteed","designation":"104 Aqr"},{"catalog":"HD","designation":"HD 222574"},{"catalog":"HIP","designation":"HIP 116901"},{"catalog":"HR","designation":"HR 8982"}],"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."}