{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.654","julian_year":2026.654,"time":"2026-08-27T21:33:02.229Z","years_from_j2000":26.654,"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":"botein","name":"Botein","class":"g9_5iiib_yellow_giant","category":"star","object_type":"G9.5IIIb yellow giant","mag":4.35,"mag_band":"V","abs_mag":0.769,"abs_mag_band":"V","distance_ly":169.69622791862216,"distance_method":"parallax","ra_deg":47.90733,"dec_deg":19.726677,"epoch_ra_deg":48.291933,"epoch_dec_deg":19.828141,"epoch_moved_arcsec":4.127,"pm_ra_mas_yr":154.61,"pm_dec_mas_yr":-8.39,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Aries","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/botein","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"spectral_type":"G9.5IIIb","uncertainties":{"metallicity_fe_h":[0.066,0.066]},"color_index_bv":1.033,"luminosity_solar":42.89434099967816,"metallicity_fe_h":0.115,"radial_velocity_km_s":25,"spectral_type_source":"SIMBAD (1989ApJS...71..245K, quality B)","surface_gravity_log_g":2.89,"surface_temperature_k":4869,"metallicity_fe_h_source":"Median of 8 spectroscopic determinations in 9 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":154.61,"proper_motion_dec_mas_yr":-8.39,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"Bayer/Flamsteed","designation":"57 Delta Ari"},{"catalog":"Common name","designation":"Botein"},{"catalog":"HD","designation":"HD 19787"},{"catalog":"HIP","designation":"HIP 14838"},{"catalog":"HR","designation":"HR 951"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-08-27T19:16:43.430Z","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."}