{"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":"2026-09-02T20:27:46.175Z","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":"hip-101364","name":"HIP 101364","class":"b3_4ia_blue_white_hypergiant","category":"star","object_type":"B3-4Ia+ blue-white hypergiant","mag":11.4,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":null,"distance_method":null,"ra_deg":308.170665,"dec_deg":41.241468,"epoch_ra_deg":308.410432,"epoch_dec_deg":41.332268,"epoch_moved_arcsec":0.083,"pm_ra_mas_yr":1.91,"pm_dec_mas_yr":-2.47,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Cygnus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hip-101364","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"20327+4114","companions":[{"measured":2006,"magnitude":13.5,"components":"Aa,Ab","discoverer_code":"CAN   5","separation_arcsec":0.1,"position_angle_deg":284}],"spectral_type":"B3-4Ia+","color_index_bv":3.01,"variable_mag_max":11.316,"variable_mag_min":11.506,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (2012A&A...541A.145C, quality C)","proper_motion_ra_mas_yr":1.91,"proper_motion_dec_mas_yr":-2.47},"designations":[{"catalog":"HIP","designation":"HIP 101364"}],"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."}