{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.680","julian_year":2026.68,"time":"2026-09-06T08:22:42.137Z","years_from_j2000":26.68,"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-145598","name":"HD 145598","class":"g8vfe_1_6ch_1_2_yellow_main_sequence_star","category":"star","object_type":"G8VFe-1.6CH-1.2 yellow main-sequence star","mag":8.65,"mag_band":"V","abs_mag":5.568,"abs_mag_band":"V","distance_ly":134.83108960983543,"distance_method":"parallax","ra_deg":243.54135000000002,"dec_deg":-50.784875,"epoch_ra_deg":244.049167,"epoch_dec_deg":-50.856232,"epoch_moved_arcsec":11.75,"pm_ra_mas_yr":17.43,"pm_dec_mas_yr":-440.06,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Norma","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-145598","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"16142-5047","age_years":839007100,"companions":[{"measured":2020,"magnitude":12,"components":null,"discoverer_code":"TOK 409","separation_arcsec":0.5,"position_angle_deg":292}],"mass_solar":0.95,"radius_solar":0.851,"spectral_type":"G8VFe-1.6CH-1.2","uncertainties":{"metallicity_fe_h":[0.032,0.032]},"color_index_bv":0.661,"luminosity_solar":0.5161786054966726,"metallicity_fe_h":-0.77,"radial_velocity_km_s":12.4,"spectral_type_source":"SIMBAD (2006AJ....132..161G, quality C)","surface_gravity_log_g":4.476,"surface_temperature_k":5469,"metallicity_fe_h_source":"Median of 5 spectroscopic determinations in 6 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":17.43,"proper_motion_dec_mas_yr":-440.06,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":0.5814},"designations":[{"catalog":"HD","designation":"HD 145598"},{"catalog":"HIP","designation":"HIP 79576"}],"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."}