{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.665","julian_year":2026.665,"time":"2026-08-31T17:16:09.221Z","years_from_j2000":26.665,"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-157246","name":"γ Ara","class":"b1ib_blue_white_supergiant","category":"star","object_type":"B1Ib blue-white supergiant","mag":3.31,"mag_band":"V","abs_mag":-4.356,"abs_mag_band":"V","distance_ly":1113.161606299536,"distance_method":"parallax","ra_deg":261.34858499999996,"dec_deg":-56.377727,"epoch_ra_deg":261.914506,"epoch_dec_deg":-56.401894,"epoch_moved_arcsec":0.423,"pm_ra_mas_yr":-0.77,"pm_dec_mas_yr":-15.85,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Ara","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-157246","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"17254-5623","companions":[{"measured":2016,"magnitude":10.21,"components":"AB","discoverer_code":"HJ 4942","separation_arcsec":18.4,"position_angle_deg":326},{"measured":2016,"magnitude":12.16,"components":"AC","discoverer_code":"HJ 4942","separation_arcsec":41.2,"position_angle_deg":64},{"measured":2016,"magnitude":12,"components":"AD","discoverer_code":"ANT   5","separation_arcsec":47.2,"position_angle_deg":39}],"spectral_type":"B1Ib","color_index_bv":-0.15,"luminosity_solar":4812.824218676023,"radial_velocity_km_s":-3,"spectral_type_source":"SIMBAD (2010A&A...521L..55P, quality C)","proper_motion_ra_mas_yr":-0.77,"proper_motion_dec_mas_yr":-15.85},"designations":[{"catalog":"Bayer/Flamsteed","designation":"Gamma Ara"},{"catalog":"HD","designation":"HD 157246"},{"catalog":"HIP","designation":"HIP 85267"},{"catalog":"HR","designation":"HR 6462"}],"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."}