{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.671","julian_year":2026.671,"time":"2026-09-03T00:28:08.152Z","years_from_j2000":26.671,"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-91312","name":"HD 91312","class":"a7iv_white_subgiant","category":"star","object_type":"A7IV white subgiant","mag":4.72,"mag_band":"V","abs_mag":2.023,"abs_mag_band":"V","distance_ly":112.93490734819957,"distance_method":"parallax","ra_deg":158.307975,"dec_deg":40.42556,"epoch_ra_deg":158.69899,"epoch_dec_deg":40.287379,"epoch_moved_arcsec":3.794,"pm_ra_mas_yr":-142.04,"pm_dec_mas_yr":8,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Ursa Major","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-91312","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"10332+4026","companions":[{"measured":2023,"magnitude":11.6,"components":"AB","discoverer_code":"HJ 2534","separation_arcsec":16.9,"position_angle_deg":5},{"measured":2016,"magnitude":18.62,"components":"AC","discoverer_code":"TOK 538","separation_arcsec":345.6,"position_angle_deg":295}],"spectral_type":"A7IV","color_index_bv":0.222,"luminosity_solar":13.514500541175588,"radial_velocity_km_s":9,"spectral_type_source":"SIMBAD (quality C)","surface_temperature_k":7727,"proper_motion_ra_mas_yr":-142.04,"proper_motion_dec_mas_yr":8,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"HD","designation":"HD 91312"},{"catalog":"HIP","designation":"HIP 51658"},{"catalog":"HR","designation":"HR 4132"}],"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."}