{"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":"2026-09-01T23:37:08.096Z","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-4863","name":"HD 4863","class":"f8_g0v_yellow_white_main_sequence_star","category":"star","object_type":"F8/G0V yellow-white main-sequence star","mag":8.28,"mag_band":"V","abs_mag":4.216,"abs_mag_band":"V","distance_ly":211.9276080181415,"distance_method":"parallax","ra_deg":11.088675,"dec_deg":-85.891535,"epoch_ra_deg":11.079989,"epoch_dec_deg":-85.744445,"epoch_moved_arcsec":2.444,"pm_ra_mas_yr":91.56,"pm_dec_mas_yr":-4.2,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Octans","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-4863","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"age_years":4703953300,"mass_solar":1.068,"radius_solar":1.151,"spectral_type":"F8/G0V","color_index_bv":0.571,"luminosity_solar":1.7930813770804404,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1975MSS...C01....0H, quality D)","surface_gravity_log_g":4.32,"surface_temperature_k":5993,"proper_motion_ra_mas_yr":91.56,"proper_motion_dec_mas_yr":-4.2,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":1.5393},"designations":[{"catalog":"HD","designation":"HD 4863"},{"catalog":"HIP","designation":"HIP 3470"}],"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."}