{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.654","julian_year":2026.654,"time":"2026-08-27T21:34:37.520Z","years_from_j2000":26.654,"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-174116","name":"29 Sgr","class":"k2iii_orange_giant","category":"star","object_type":"K2III orange giant","mag":5.22,"mag_band":"V","abs_mag":-2.066,"abs_mag_band":"V","distance_ly":934.5456537631164,"distance_method":"parallax","ra_deg":282.417105,"dec_deg":-20.324656,"epoch_ra_deg":282.815197,"epoch_dec_deg":-20.294015,"epoch_moved_arcsec":0.926,"pm_ra_mas_yr":-1.82,"pm_dec_mas_yr":34.7,"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-174116","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"18497-2019","companions":[{"measured":2000,"magnitude":14,"components":null,"discoverer_code":"SEE 362","separation_arcsec":13.8,"position_angle_deg":0}],"spectral_type":"K2III","uncertainties":{"metallicity_fe_h":[0.13,0.13]},"color_index_bv":1.404,"luminosity_solar":583.9827246189302,"metallicity_fe_h":-0.51,"radial_velocity_km_s":-17.7,"spectral_type_source":"SIMBAD (1988MSS...C04....0H, quality C)","surface_gravity_log_g":1.46,"surface_temperature_k":4180,"metallicity_fe_h_source":"Median of 2 spectroscopic determinations in 2 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":-1.82,"proper_motion_dec_mas_yr":34.7,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"Bayer/Flamsteed","designation":"29 Sgr"},{"catalog":"Gliese","designation":"GJ 4080"},{"catalog":"HD","designation":"HD 174116"},{"catalog":"HIP","designation":"HIP 92390"},{"catalog":"HR","designation":"HR 7078"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-08-27T19:16:43.430Z","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."}