{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.663","julian_year":2026.663,"time":"2026-08-31T02:04:53.522Z","years_from_j2000":26.663,"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-36167","name":"31 Ori","class":"k4iii_orange_giant","category":"star","object_type":"K4III orange giant","mag":4.71,"mag_band":"V","abs_mag":-1.252,"abs_mag_band":"V","distance_ly":508.0316109356865,"distance_method":"parallax","ra_deg":82.43325,"dec_deg":-1.092239,"epoch_ra_deg":82.774423,"epoch_dec_deg":-1.070886,"epoch_moved_arcsec":0.695,"pm_ra_mas_yr":0.19,"pm_dec_mas_yr":-26.08,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Orion","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-36167","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"05297-0106","companions":[{"measured":2015,"magnitude":9.7,"components":null,"discoverer_code":"STF 725","separation_arcsec":12.7,"position_angle_deg":87}],"mass_solar":5.208,"radius_solar":61.705,"spectral_type":"K4III","color_index_bv":1.592,"luminosity_solar":275.9306855817509,"metallicity_fe_h":-0.3,"variability_type":"CST:","variable_mag_max":4.694,"variable_mag_min":4.724,"variability_class":"Not variable (GCVS)","radial_velocity_km_s":8,"spectral_type_source":"SIMBAD (2008ApJS..176..216A, quality C)","variable_designation":"CI Ori","surface_gravity_log_g":0.92,"surface_temperature_k":4610,"metallicity_fe_h_source":"One spectroscopic determination, compiled from the literature (PASTEL, Soubiran+ 2016)","proper_motion_ra_mas_yr":0.19,"proper_motion_dec_mas_yr":-26.08,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":1361.2258},"designations":[{"catalog":"Bayer/Flamsteed","designation":"31 Ori"},{"catalog":"HD","designation":"HD 36167"},{"catalog":"HIP","designation":"HIP 25737"},{"catalog":"HR","designation":"HR 1834"},{"catalog":"Variable star","designation":"CI Ori"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-08-30T09:56:50.739Z","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."}