{"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":"2026-09-02T19:29:17.447Z","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-150997","name":"44 η Her","class":"g7iiife_1_yellow_giant","category":"star","object_type":"G7IIIFe-1 yellow giant","mag":3.48,"mag_band":"V","abs_mag":0.867,"abs_mag_band":"V","distance_ly":108.64627713760213,"distance_method":"parallax","ra_deg":250.72399499999997,"dec_deg":38.922254,"epoch_ra_deg":250.955049,"epoch_dec_deg":38.870389,"epoch_moved_arcsec":2.457,"pm_ra_mas_yr":35.58,"pm_dec_mas_yr":-84.98,"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-150997","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"16429+3855","companions":[{"measured":2015,"magnitude":13.94,"components":"AC","discoverer_code":"VLM   5","separation_arcsec":84,"position_angle_deg":284},{"measured":2020,"magnitude":11.72,"components":"AB","discoverer_code":"STF2093","separation_arcsec":116.4,"position_angle_deg":266}],"spectral_type":"G7IIIFe-1","uncertainties":{"metallicity_fe_h":[0.1,0.1]},"color_index_bv":0.916,"luminosity_solar":39.192232245497664,"metallicity_fe_h":-0.15,"radial_velocity_km_s":8,"spectral_type_source":"SIMBAD (1989ApJS...71..245K, quality C)","surface_gravity_log_g":2.96,"surface_temperature_k":4948,"metallicity_fe_h_source":"Median of 9 spectroscopic determinations in 14 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":35.58,"proper_motion_dec_mas_yr":-84.98,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"Bayer/Flamsteed","designation":"44 Eta Her"},{"catalog":"HD","designation":"HD 150997"},{"catalog":"HIP","designation":"HIP 81833"},{"catalog":"HR","designation":"HR 6220"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-09-02T18:38:07.546Z","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."}