{"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":"2026-08-27T17:05:54.749Z","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":"ross-248","name":"Ross 248","class":"dm6_e_red_dwarf","category":"star","object_type":"dM6  e red dwarf","mag":12.29,"mag_band":"V","abs_mag":14.786,"abs_mag_band":"V","distance_ly":10.334590984332733,"distance_method":"parallax","ra_deg":355.475685,"dec_deg":44.174924,"epoch_ra_deg":355.807196,"epoch_dec_deg":44.311856,"epoch_moved_arcsec":42.912,"pm_ra_mas_yr":84.26,"pm_dec_mas_yr":-1607.79,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Andromeda","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/ross-248","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"spectral_type":"dM6  e","color_index_bv":1.9,"luminosity_solar":0.0001060718149635,"radial_velocity_km_s":-77.7,"proper_motion_ra_mas_yr":84.26,"proper_motion_dec_mas_yr":-1607.79},"designations":[{"catalog":"Common name","designation":"Ross 248"},{"catalog":"Gliese","designation":"Gl 905"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-08-27T16:03:54.983Z","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."}