{"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":"2026-09-03T06:02:42.396Z","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":"hip-2540","name":"HIP 2540","class":"k7v_orange_dwarf","category":"star","object_type":"K7V orange dwarf","mag":9.65,"mag_band":"V","abs_mag":7.663,"abs_mag_band":"V","distance_ly":81.43733363933823,"distance_method":"parallax","ra_deg":8.06268,"dec_deg":-63.091258,"epoch_ra_deg":8.377862,"epoch_dec_deg":-62.943728,"epoch_moved_arcsec":14.391,"pm_ra_mas_yr":530.04,"pm_dec_mas_yr":-100.87,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Tucana","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hip-2540","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"00323-6304","age_years":13364567000,"companions":[{"measured":1985,"magnitude":13.2,"components":null,"discoverer_code":"LDS9092","separation_arcsec":1.1,"position_angle_deg":131}],"mass_solar":0.709,"radius_solar":1.017,"spectral_type":"K7V","color_index_bv":1.367,"luminosity_solar":0.0749548949791958,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1974PhDT........10S, quality C)","surface_gravity_log_g":4.104,"surface_temperature_k":3781,"proper_motion_ra_mas_yr":530.04,"proper_motion_dec_mas_yr":-100.87,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":0.1964},"designations":[{"catalog":"Gliese","designation":"GJ 3038"},{"catalog":"HIP","designation":"HIP 2540"}],"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."}