{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.778","julian_year":2026.778,"time":"2026-10-12T01:27:28.594Z","years_from_j2000":26.778,"frame":"date","applied":"Proper motion, then precession and nutation. The catalogued position is carried along the great circle the object's own published motion puts it on, at a constant velocity, from the epoch that position was measured at, 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. The motion runs from position_epoch_jyear where the upstream publishes one — a timed pulsar's position belongs to the year it was timed — and from J2000 where it does not. 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":"okab","name":"Okab","class":"a0iv_vnn_white_subgiant","category":"star","object_type":"A0IV-Vnn white subgiant","mag":2.99,"mag_band":"V","abs_mag":0.961,"abs_mag_band":"V","distance_ly":83.03354295188397,"distance_method":"parallax","ra_deg":286.352535,"dec_deg":13.863478,"epoch_ra_deg":286.6619,"epoch_dec_deg":13.903201,"epoch_moved_arcsec":2.559,"pm_ra_mas_yr":-7.04,"pm_dec_mas_yr":-95.31,"position_epoch_jyear":null,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Aquila","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/okab","source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0","attribution":"HYG Database v4.1, Astronexus (github.com/astronexus/HYG-Database). Fields derived from it stay under CC BY-SA 4.0.","commercial_use":"allowed"},"radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"19054+1352","companions":[{"measured":2016,"magnitude":12,"components":"AB","discoverer_code":"BU  287","separation_arcsec":7.4,"position_angle_deg":46},{"measured":2014,"magnitude":12.2,"components":"AC","discoverer_code":"BU  287","separation_arcsec":161,"position_angle_deg":75},{"measured":2014,"magnitude":10.65,"components":"AD","discoverer_code":"POP1225","separation_arcsec":199.4,"position_angle_deg":151}],"spectral_type":"A0IV-Vnn","color_index_bv":0.014,"luminosity_solar":35.94181463147148,"radial_velocity_km_s":-25,"spectral_type_source":"SIMBAD (2003AJ....126.2048G, quality C)","surface_temperature_k":9366,"proper_motion_ra_mas_yr":-7.04,"proper_motion_dec_mas_yr":-95.31,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"Bayer/Flamsteed","designation":"17 Zeta Aql"},{"catalog":"Common name","designation":"Okab"},{"catalog":"Gliese","designation":"GJ 4095A"},{"catalog":"HD","designation":"HD 177724"},{"catalog":"HIP","designation":"HIP 93747"},{"catalog":"HR","designation":"HR 7235"}],"updated_at":"2026-10-01T09:42:28.932Z","attribution":"Data from SpaceCatalog.org. Each record names its upstream in `source`, with that producer's terms in `source.license`, the acknowledgement it asks for in `source.attribution`, and whether its terms allow commercial use in `source.commercial_use`; those terms govern the record, and citing SpaceCatalog does not discharge them."}