{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.663","julian_year":2026.663,"time":"2026-08-31T03:30:37.703Z","years_from_j2000":26.663,"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":"alsafi","name":"Alsafi","class":"k0v_orange_dwarf","category":"star","object_type":"K0V orange dwarf","mag":4.67,"mag_band":"V","abs_mag":5.87,"abs_mag_band":"V","distance_ly":18.769321068465434,"distance_method":"parallax","ra_deg":293.08723499999996,"dec_deg":69.661175,"epoch_ra_deg":293.070276,"epoch_dec_deg":69.704757,"epoch_moved_arcsec":49.031,"pm_ra_mas_yr":598.43,"pm_dec_mas_yr":-1738.81,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Draco","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/alsafi","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"spectral_type":"K0V","color_index_bv":0.786,"luminosity_solar":0.39084089579240183,"radial_velocity_km_s":28.2,"spectral_type_source":"SIMBAD (1989ApJS...71..245K, quality B)","proper_motion_ra_mas_yr":598.43,"proper_motion_dec_mas_yr":-1738.81},"designations":[{"catalog":"Bayer/Flamsteed","designation":"61 Sigma Dra"},{"catalog":"Common name","designation":"Alsafi"},{"catalog":"Gliese","designation":"Gl 764"},{"catalog":"HD","designation":"HD 185144"},{"catalog":"HIP","designation":"HIP 96100"},{"catalog":"HR","designation":"HR 7462"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-08-30T09:56:50.739Z","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."}