{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.676","julian_year":2026.676,"time":"2026-09-05T01:12:20.767Z","years_from_j2000":26.676,"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-184930","name":"41 ι Aql","class":"b5iii_blue_white_giant","category":"star","object_type":"B5III blue-white giant","mag":4.36,"mag_band":"V","abs_mag":-1.034,"abs_mag_band":"V","distance_ly":391.07486929386175,"distance_method":"parallax","ra_deg":294.18032999999997,"dec_deg":-1.286601,"epoch_ra_deg":294.527481,"epoch_dec_deg":-1.22718,"epoch_moved_arcsec":0.556,"pm_ra_mas_yr":1.89,"pm_dec_mas_yr":-20.75,"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/hd-184930","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"19367-0117","companions":[{"measured":2016,"magnitude":13,"components":null,"discoverer_code":"J   118","separation_arcsec":45.4,"position_angle_deg":161}],"mass_solar":4.704,"radius_solar":7.133,"spectral_type":"B5III","color_index_bv":-0.079,"luminosity_solar":225.73557110214452,"radial_velocity_km_s":-21,"spectral_type_source":"SIMBAD (quality C)","surface_gravity_log_g":3.417,"surface_temperature_k":12187,"proper_motion_ra_mas_yr":1.89,"proper_motion_dec_mas_yr":-20.75,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4) — low confidence: above 7,500 K GSP-Phot's temperature and extinction are degenerate","bolometric_luminosity_solar":943.9937},"designations":[{"catalog":"Bayer/Flamsteed","designation":"41 Iota Aql"},{"catalog":"HD","designation":"HD 184930"},{"catalog":"HIP","designation":"HIP 96468"},{"catalog":"HR","designation":"HR 7447"}],"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."}