{"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":"2026-09-02T03:59:05.212Z","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-48640","name":"HD 48640","class":"k2_3ib_orange_supergiant","category":"star","object_type":"K2/3Ib orange supergiant","mag":6.95,"mag_band":"V","abs_mag":-1.513,"abs_mag_band":"V","distance_ly":1606.6815415214714,"distance_method":"parallax","ra_deg":101.34793499999999,"dec_deg":24.67247,"epoch_ra_deg":101.759375,"epoch_dec_deg":24.644772,"epoch_moved_arcsec":0.085,"pm_ra_mas_yr":-0.01,"pm_dec_mas_yr":-3.17,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Gemini","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-48640","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"06454+2440","companions":[{"measured":2016,"magnitude":10.93,"components":null,"discoverer_code":"STT 155","separation_arcsec":15.3,"position_angle_deg":260}],"radius_solar":140.039,"spectral_type":"K2/3Ib","uncertainties":{"metallicity_fe_h":[0.055,0.055]},"color_index_bv":1.65,"luminosity_solar":350.91343835855247,"metallicity_fe_h":-0.075,"radial_velocity_km_s":21.5,"spectral_type_source":"SIMBAD (1960AJ.....65...60S, quality C)","surface_gravity_log_g":1.016,"surface_temperature_k":4274,"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":-0.01,"proper_motion_dec_mas_yr":-3.17,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)"},"designations":[{"catalog":"HD","designation":"HD 48640"},{"catalog":"HIP","designation":"HIP 32369"}],"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."}