{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.668","julian_year":2026.668,"time":"2026-09-01T23:24:51.368Z","years_from_j2000":26.668,"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-77912","name":"HD 77912","class":"g7iia_yellow_bright_giant","category":"star","object_type":"G7IIa yellow bright giant","mag":4.56,"mag_band":"V","abs_mag":-2.435,"abs_mag_band":"V","distance_ly":817.4346401546317,"distance_method":"parallax","ra_deg":136.632375,"dec_deg":38.452215,"epoch_ra_deg":137.05846,"epoch_dec_deg":38.344652,"epoch_moved_arcsec":0.848,"pm_ra_mas_yr":-28.37,"pm_dec_mas_yr":-14.34,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Lynx","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-77912","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"spectral_type":"G7IIa","uncertainties":{"metallicity_fe_h":[0.13,0.13]},"color_index_bv":1.037,"luminosity_solar":820.3515443298185,"metallicity_fe_h":0.25,"radial_velocity_km_s":17,"spectral_type_source":"SIMBAD (1989ApJS...71..245K, quality C)","surface_gravity_log_g":2.01,"surface_temperature_k":5000,"metallicity_fe_h_source":"Median of 2 spectroscopic determinations in 3 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":-28.37,"proper_motion_dec_mas_yr":-14.34,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"HD","designation":"HD 77912"},{"catalog":"HIP","designation":"HIP 44700"},{"catalog":"HR","designation":"HR 3612"}],"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."}