{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.672","julian_year":2026.672,"time":"2026-09-03T07:24:29.151Z","years_from_j2000":26.672,"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-187702","name":"HD 187702","class":"g6_8v_yellow_main_sequence_star","category":"star","object_type":"G6/8V yellow main-sequence star","mag":9.93,"mag_band":"V","abs_mag":4.001,"abs_mag_band":"V","distance_ly":500.2397350720335,"distance_method":"parallax","ra_deg":298.33455000000004,"dec_deg":-45.10076,"epoch_ra_deg":298.811607,"epoch_dec_deg":-45.031205,"epoch_moved_arcsec":0.887,"pm_ra_mas_yr":31.6,"pm_dec_mas_yr":10.31,"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-187702","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"age_years":7293234000,"mass_solar":1.086,"radius_solar":1.51,"spectral_type":"G6/8V","color_index_bv":0.73,"luminosity_solar":2.185747548686933,"variable_mag_max":9.881,"variable_mag_min":9.981,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1978MSS...C02....0H, quality D)","surface_gravity_log_g":4.164,"surface_temperature_k":5915,"proper_motion_ra_mas_yr":31.6,"proper_motion_dec_mas_yr":10.31,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":2.5137},"designations":[{"catalog":"HD","designation":"HD 187702"},{"catalog":"HIP","designation":"HIP 97873"}],"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."}