{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.671","julian_year":2026.671,"time":"2026-09-03T04:03:25.683Z","years_from_j2000":26.671,"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-23453","name":"HD 23453","class":"m1v_red_dwarf","category":"star","object_type":"M1V red dwarf","mag":9.61,"mag_band":"V","abs_mag":8.766,"abs_mag_band":"V","distance_ly":48.10578261857564,"distance_method":"parallax","ra_deg":56.58381,"dec_deg":26.215501,"epoch_ra_deg":56.992113,"epoch_dec_deg":26.297831,"epoch_moved_arcsec":11.595,"pm_ra_mas_yr":386.94,"pm_dec_mas_yr":-198.16,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Taurus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-23453","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"age_years":8929077000,"mass_solar":0.596,"radius_solar":0.681,"spectral_type":"M1V","color_index_bv":1.437,"luminosity_solar":0.027139384876415866,"metallicity_fe_h":0.45,"radial_velocity_km_s":36.3,"spectral_type_source":"SIMBAD (2003AJ....126.2048G, quality C)","surface_gravity_log_g":4.434,"surface_temperature_k":3656,"metallicity_fe_h_source":"One spectroscopic determination, compiled from the literature (PASTEL, Soubiran+ 2016)","proper_motion_ra_mas_yr":386.94,"proper_motion_dec_mas_yr":-198.16,"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":0.0737},"designations":[{"catalog":"Gliese","designation":"Gl 154"},{"catalog":"HD","designation":"HD 23453"},{"catalog":"HIP","designation":"HIP 17609"}],"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."}