{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.679","julian_year":2026.679,"time":"2026-09-05T21:52:01.444Z","years_from_j2000":26.679,"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-157198","name":"70 Her","class":"a2v_white_main_sequence_star","category":"star","object_type":"A2V white main-sequence star","mag":5.13,"mag_band":"V","abs_mag":-0.457,"abs_mag_band":"V","distance_ly":427.4657671376074,"distance_method":"parallax","ra_deg":260.225865,"dec_deg":24.499435,"epoch_ra_deg":260.502911,"epoch_dec_deg":24.472133,"epoch_moved_arcsec":0.519,"pm_ra_mas_yr":-19.36,"pm_dec_mas_yr":-1.91,"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/hd-157198","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"17209+2430","companions":[{"measured":2020,"magnitude":10.76,"components":"AD","discoverer_code":"GUI  41","separation_arcsec":221.7,"position_angle_deg":223},{"measured":2023,"magnitude":9.33,"components":"AB","discoverer_code":"S   687","separation_arcsec":223.3,"position_angle_deg":56},{"measured":2015,"magnitude":12.58,"components":"AC","discoverer_code":"S   687","separation_arcsec":240.3,"position_angle_deg":20},{"measured":2010,"magnitude":11.32,"components":"AE","discoverer_code":"SLE 689","separation_arcsec":549.7,"position_angle_deg":29}],"spectral_type":"A2V","color_index_bv":0,"luminosity_solar":132.678331072416,"radial_velocity_km_s":-18,"spectral_type_source":"SIMBAD (quality C)","surface_temperature_k":9290,"proper_motion_ra_mas_yr":-19.36,"proper_motion_dec_mas_yr":-1.91,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"Bayer/Flamsteed","designation":"70 Her"},{"catalog":"HD","designation":"HD 157198"},{"catalog":"HIP","designation":"HIP 84887"},{"catalog":"HR","designation":"HR 6457"}],"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."}