{"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":"2026-09-02T04:17:40.294Z","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-1544","name":"HD 1544","class":"b0_5iii_n_blue_white_giant","category":"star","object_type":"B0.5III(n) blue-white giant","mag":8.13,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":null,"distance_method":null,"ra_deg":5.023095,"dec_deg":62.066306,"epoch_ra_deg":5.388382,"epoch_dec_deg":62.21536,"epoch_moved_arcsec":0.047,"pm_ra_mas_yr":-1.38,"pm_dec_mas_yr":-1.11,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Cassiopeia","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-1544","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"spectral_type":"B0.5III(n)","color_index_bv":0.154,"radial_velocity_km_s":-52,"spectral_type_source":"SIMBAD (1971ApJS...23..257W, quality C)","surface_gravity_log_g":3.12,"surface_temperature_k":22957,"proper_motion_ra_mas_yr":-1.38,"proper_motion_dec_mas_yr":-1.11,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"HD","designation":"HD 1544"},{"catalog":"HIP","designation":"HIP 1605"}],"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."}