{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.684","julian_year":2026.684,"time":"2026-09-07T15:51:32.008Z","years_from_j2000":26.684,"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":"hip-81242","name":"HIP 81242","class":"g0_yellow_star","category":"star","object_type":"G0 yellow star","mag":9.26,"mag_band":"V","abs_mag":3.498,"abs_mag_band":"V","distance_ly":463.2904575096368,"distance_method":"parallax","ra_deg":248.88890999999998,"dec_deg":47.683081,"epoch_ra_deg":249.080613,"epoch_dec_deg":47.627394,"epoch_moved_arcsec":0.719,"pm_ra_mas_yr":-22.85,"pm_dec_mas_yr":14.31,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Hercules","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hip-81242","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"16355+4741","age_years":3998313400,"companions":[{"measured":2020,"magnitude":10.59,"components":null,"discoverer_code":"STF2072","separation_arcsec":5.1,"position_angle_deg":179}],"mass_solar":1.104,"radius_solar":1.194,"spectral_type":"G0","color_index_bv":0.615,"luminosity_solar":3.473761519726526,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (quality D)","surface_gravity_log_g":4.275,"surface_temperature_k":6084,"proper_motion_ra_mas_yr":-22.85,"proper_motion_dec_mas_yr":14.31,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4) — low confidence: Gaia's classifier calls the source a binary, which GSP-Phot fitted as one star","bolometric_luminosity_solar":1.7591},"designations":[{"catalog":"HIP","designation":"HIP 81242"}],"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."}