{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.674","julian_year":2026.674,"time":"2026-09-04T02:26:55.736Z","years_from_j2000":26.674,"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-215449","name":"HD 215449","class":"a5iv_white_subgiant","category":"star","object_type":"A5IV white subgiant","mag":7.43,"mag_band":"V","abs_mag":2.802,"abs_mag_band":"V","distance_ly":274.77370197124765,"distance_method":"parallax","ra_deg":341.33665499999995,"dec_deg":-9.644538,"epoch_ra_deg":341.689239,"epoch_dec_deg":-9.503565,"epoch_moved_arcsec":0.597,"pm_ra_mas_yr":19.04,"pm_dec_mas_yr":-11.8,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Aquarius","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-215449","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"22453-0939","age_years":612781050,"companions":[{"measured":2017,"magnitude":9.3,"components":null,"discoverer_code":"STF2939","separation_arcsec":11,"position_angle_deg":63}],"mass_solar":1.692,"radius_solar":1.671,"spectral_type":"A5IV","color_index_bv":0.2,"luminosity_solar":6.594775259494848,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1999MSS...C05....0H, quality C)","surface_gravity_log_g":4.053,"surface_temperature_k":7898,"proper_motion_ra_mas_yr":19.04,"proper_motion_dec_mas_yr":-11.8,"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":9.5767},"designations":[{"catalog":"HD","designation":"HD 215449"},{"catalog":"HIP","designation":"HIP 112346"}],"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."}