{"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":"2026-09-02T03:44:44.424Z","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-41312","name":"HD 41312","class":"k2_5iiife_2_orange_giant","category":"star","object_type":"K2.5IIIFe-2 orange giant","mag":5.03,"mag_band":"V","abs_mag":-0.449,"abs_mag_band":"V","distance_ly":406.6788427165862,"distance_method":"parallax","ra_deg":90.814995,"dec_deg":-26.284544,"epoch_ra_deg":91.085713,"epoch_dec_deg":-26.284087,"epoch_moved_arcsec":2.868,"pm_ra_mas_yr":66.18,"pm_dec_mas_yr":84.77,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Lepus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-41312","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"06033-2617","age_years":455653280,"companions":[{"measured":2016,"magnitude":11.3,"components":"AB","discoverer_code":"B    96","separation_arcsec":2.6,"position_angle_deg":122},{"measured":1897,"magnitude":15,"components":"AC","discoverer_code":"SEE  59","separation_arcsec":21.3,"position_angle_deg":203},{"measured":2015,"magnitude":11.3,"components":"AD","discoverer_code":"B    96","separation_arcsec":40.8,"position_angle_deg":2}],"mass_solar":2.805,"radius_solar":31.485,"spectral_type":"K2.5IIIFe-2","uncertainties":{"metallicity_fe_h":[0.01,0.01]},"color_index_bv":1.335,"luminosity_solar":131.70431381998404,"metallicity_fe_h":-0.6,"radial_velocity_km_s":182,"spectral_type_source":"SIMBAD (1989ApJS...71..245K, quality C)","surface_gravity_log_g":1.358,"surface_temperature_k":4279,"metallicity_fe_h_source":"Median of 2 spectroscopic determinations in 2 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":66.18,"proper_motion_dec_mas_yr":84.77,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":326.1138},"designations":[{"catalog":"HD","designation":"HD 41312"},{"catalog":"HIP","designation":"HIP 28675"},{"catalog":"HR","designation":"HR 2140"}],"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."}