{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.670","julian_year":2026.67,"time":"2026-09-02T17:42:03.246Z","years_from_j2000":26.67,"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-217811","name":"LN And","class":"b2v_blue_white_main_sequence_star","category":"star","object_type":"B2V blue-white main-sequence star","mag":6.37,"mag_band":"V","abs_mag":-1.194,"abs_mag_band":"V","distance_ly":1062.3986276717021,"distance_method":"parallax","ra_deg":345.68812499999996,"dec_deg":44.05875,"epoch_ra_deg":345.99453,"epoch_dec_deg":44.203078,"epoch_moved_arcsec":0.17,"pm_ra_mas_yr":2.19,"pm_dec_mas_yr":-5.99,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Andromeda","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-217811","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"23028+4404","companions":[{"measured":2021,"magnitude":10.14,"components":null,"discoverer_code":"STF2973","separation_arcsec":7.6,"position_angle_deg":40}],"spectral_type":"B2V","color_index_bv":-0.02,"luminosity_solar":261.57726827191084,"variability_type":"CST:","variable_mag_max":6.354,"variable_mag_min":6.384,"variability_class":"Not variable (GCVS)","radial_velocity_km_s":-8,"spectral_type_source":"SIMBAD (quality C)","variable_designation":"LN And","surface_gravity_log_g":3.73,"surface_temperature_k":19070,"proper_motion_ra_mas_yr":2.19,"proper_motion_dec_mas_yr":-5.99,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"HD","designation":"HD 217811"},{"catalog":"HIP","designation":"HIP 113802"},{"catalog":"HR","designation":"HR 8768"},{"catalog":"Variable star","designation":"LN And"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-09-01T22:58:55.274Z","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."}