{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.670","julian_year":2026.67,"time":"2026-09-02T15:37:26.762Z","years_from_j2000":26.67,"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-35620","name":"24 φ Aur","class":"k3iiife1_orange_giant","category":"star","object_type":"K3IIIFe1 orange giant","mag":5.08,"mag_band":"V","abs_mag":-0.633,"abs_mag_band":"V","distance_ly":452.99500529063005,"distance_method":"parallax","ra_deg":81.91203,"dec_deg":34.475892,"epoch_ra_deg":82.357532,"epoch_dec_deg":34.498341,"epoch_moved_arcsec":1.036,"pm_ra_mas_yr":-1.44,"pm_dec_mas_yr":-38.81,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Auriga","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-35620","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"05276+3429","companions":[{"measured":2013,"magnitude":14.6,"components":"AB","discoverer_code":"BUP  79","separation_arcsec":23.6,"position_angle_deg":353},{"measured":2013,"magnitude":10.87,"components":"AC","discoverer_code":"BUP  79","separation_arcsec":61.8,"position_angle_deg":72},{"measured":2013,"magnitude":8.07,"components":"AD","discoverer_code":"BLL  15","separation_arcsec":210.1,"position_angle_deg":15}],"spectral_type":"K3IIIFe1","uncertainties":{"metallicity_fe_h":[0.237,0.237]},"color_index_bv":1.4,"luminosity_solar":156.02708686930617,"metallicity_fe_h":-0.02,"radial_velocity_km_s":31,"spectral_type_source":"SIMBAD (1989ApJS...71..245K, quality B)","surface_gravity_log_g":1.5,"surface_temperature_k":4200,"metallicity_fe_h_source":"Median of 4 spectroscopic determinations in 7 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":-1.44,"proper_motion_dec_mas_yr":-38.81,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"Bayer/Flamsteed","designation":"24 Phi Aur"},{"catalog":"HD","designation":"HD 35620"},{"catalog":"HIP","designation":"HIP 25541"},{"catalog":"HR","designation":"HR 1805"}],"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."}