{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.679","julian_year":2026.679,"time":"2026-09-06T00:24:59.323Z","years_from_j2000":26.679,"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-91128","name":"HIP 91128","class":"m0_5v_red_dwarf","category":"star","object_type":"M0.5V red dwarf","mag":9.84,"mag_band":"V","abs_mag":8.882,"abs_mag_band":"V","distance_ly":50.70851051275525,"distance_method":"parallax","ra_deg":278.82615,"dec_deg":45.744041,"epoch_ra_deg":279.023071,"epoch_dec_deg":45.767687,"epoch_moved_arcsec":15.489,"pm_ra_mas_yr":451.8,"pm_dec_mas_yr":364.58,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Lyra","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hip-91128","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"spectral_type":"M0.5V","color_index_bv":1.415,"luminosity_solar":0.024389337302789128,"radial_velocity_km_s":-31.2,"spectral_type_source":"SIMBAD (1991ApJS...77..417K, quality B)","proper_motion_ra_mas_yr":451.8,"proper_motion_dec_mas_yr":364.58},"designations":[{"catalog":"Exoplanet host","designation":"GJ 720 A"},{"catalog":"Gliese","designation":"Gl 720A"},{"catalog":"HIP","designation":"HIP 91128"}],"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."}