{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.675","julian_year":2026.675,"time":"2026-09-04T09:54:31.568Z","years_from_j2000":26.675,"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":"hip-31740","name":"HIP 31740","class":"g4_yellow_star","category":"star","object_type":"G4 yellow star","mag":10.11,"mag_band":"V","abs_mag":5.17,"abs_mag_band":"V","distance_ly":317.2728564568725,"distance_method":"parallax","ra_deg":99.602685,"dec_deg":48.798604,"epoch_ra_deg":100.116904,"epoch_dec_deg":48.773333,"epoch_moved_arcsec":7.793,"pm_ra_mas_yr":133.92,"pm_dec_mas_yr":-259.63,"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/hip-31740","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"06384+4848","companions":[{"measured":2015,"magnitude":17.46,"components":null,"discoverer_code":"LDS3714","separation_arcsec":61.7,"position_angle_deg":340}],"spectral_type":"G4","color_index_bv":0.73,"luminosity_solar":0.7447319739059889,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1985ApJS...59..197B, quality D)","proper_motion_ra_mas_yr":133.92,"proper_motion_dec_mas_yr":-259.63},"designations":[{"catalog":"HIP","designation":"HIP 31740"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-09-02T19:50:56.720Z","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."}