{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.808","julian_year":2026.808,"time":"2026-10-22T23:15:43.261Z","years_from_j2000":26.808,"frame":"date","applied":"Proper motion, then precession and nutation. The catalogued position is carried along the great circle the object's own published motion puts it on, at a constant velocity, from the epoch that position was measured at, 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. The motion runs from position_epoch_jyear where the upstream publishes one — a timed pulsar's position belongs to the year it was timed — and from J2000 where it does not. 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-185131","name":"HD 185131","class":"f6_8v_yellow_white_main_sequence_star","category":"star","object_type":"F6/8V yellow-white main-sequence star","mag":10.32,"mag_band":"V","abs_mag":4.348,"abs_mag_band":"V","distance_ly":510.416792525929,"distance_method":"parallax","ra_deg":294.71253,"dec_deg":-30.939383,"epoch_ra_deg":295.140305,"epoch_dec_deg":-30.878471,"epoch_moved_arcsec":1.372,"pm_ra_mas_yr":21.47,"pm_dec_mas_yr":-46.47,"position_epoch_jyear":null,"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-185131","source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0","attribution":"HYG Database v4.1, Astronexus (github.com/astronexus/HYG-Database). Fields derived from it stay under CC BY-SA 4.0.","commercial_use":"allowed"},"radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"age_years":5361026300,"mass_solar":1.121,"radius_solar":1.352,"spectral_type":"F6/8V","color_index_bv":0.54,"luminosity_solar":1.587815364205615,"variable_mag_max":10.241,"variable_mag_min":10.371,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1982MSS...C03....0H, quality D)","surface_gravity_log_g":4.212,"surface_temperature_k":6003,"proper_motion_ra_mas_yr":21.47,"proper_motion_dec_mas_yr":-46.47,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":2.1381},"designations":[{"catalog":"HD","designation":"HD 185131"},{"catalog":"HIP","designation":"HIP 96633"}],"updated_at":"2026-10-01T09:42:28.932Z","attribution":"Data from SpaceCatalog.org. Each record names its upstream in `source`, with that producer's terms in `source.license`, the acknowledgement it asks for in `source.attribution`, and whether its terms allow commercial use in `source.commercial_use`; those terms govern the record, and citing SpaceCatalog does not discharge them."}