{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.664","julian_year":2026.664,"time":"2026-08-31T10:16:01.025Z","years_from_j2000":26.664,"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-171237","name":"25 Sgr","class":"f2ii_yellow_white_bright_giant","category":"star","object_type":"F2II yellow-white bright giant","mag":6.53,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":null,"distance_method":null,"ra_deg":278.636505,"dec_deg":-24.222393,"epoch_ra_deg":279.04703,"epoch_dec_deg":-24.201729,"epoch_moved_arcsec":0.051,"pm_ra_mas_yr":-1.19,"pm_dec_mas_yr":-1.5,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Sagittarius","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-171237","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"spectral_type":"F2II","uncertainties":{"metallicity_fe_h":[0.119,0.119]},"color_index_bv":0.515,"metallicity_fe_h":-0.06,"radial_velocity_km_s":8,"spectral_type_source":"SIMBAD (1988MSS...C04....0H, quality C)","surface_gravity_log_g":1.59,"surface_temperature_k":6611,"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":-1.19,"proper_motion_dec_mas_yr":-1.5,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"Bayer/Flamsteed","designation":"25 Sgr"},{"catalog":"HD","designation":"HD 171237"},{"catalog":"HIP","designation":"HIP 91066"},{"catalog":"HR","designation":"HR 6965"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-08-30T09:56:50.739Z","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."}