{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.669","julian_year":2026.669,"time":"2026-09-02T05:48:45.460Z","years_from_j2000":26.669,"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-7449","name":"HD 7449","class":"f9_5v_yellow_white_main_sequence_star","category":"star","object_type":"F9.5V yellow-white main-sequence star","mag":7.5,"mag_band":"V","abs_mag":4.549,"abs_mag_band":"V","distance_ly":126.9586531208864,"distance_method":"parallax","ra_deg":18.62217,"dec_deg":-5.047387,"epoch_ra_deg":18.960972,"epoch_dec_deg":-4.906168,"epoch_moved_arcsec":5.668,"pm_ra_mas_yr":-161.09,"pm_dec_mas_yr":-138.65,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Cetus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-7449","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"01145-0503","age_years":3581869600,"companions":[{"measured":2015,"magnitude":16.3,"components":"Aa,Ab","discoverer_code":"RGS   1","separation_arcsec":0.5,"position_angle_deg":342},{"measured":1980,"magnitude":19.5,"components":"AB","discoverer_code":"ROL   1","separation_arcsec":60.2,"position_angle_deg":271}],"mass_solar":1.055,"radius_solar":1.066,"spectral_type":"F9.5V","uncertainties":{"metallicity_fe_h":[0.026,0.026]},"color_index_bv":0.575,"luminosity_solar":1.319471457195117,"metallicity_fe_h":-0.11,"radial_velocity_km_s":-19.2,"spectral_type_source":"SIMBAD (2006AJ....132..161G, quality C)","surface_gravity_log_g":4.292,"surface_temperature_k":5925,"metallicity_fe_h_source":"Median of 5 spectroscopic determinations in 7 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":-161.09,"proper_motion_dec_mas_yr":-138.65,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4) — low confidence: Gaia's classifier calls the source a binary, which GSP-Phot fitted as one star","bolometric_luminosity_solar":1.2547},"designations":[{"catalog":"HD","designation":"HD 7449"},{"catalog":"HIP","designation":"HIP 5806"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-09-01T22:58:55.274Z","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."}