{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.671","julian_year":2026.671,"time":"2026-09-02T22:25:41.018Z","years_from_j2000":26.671,"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-2778","name":"HD 2778","class":"k5_orange_star","category":"star","object_type":"K5 orange star","mag":7.48,"mag_band":"V","abs_mag":0.131,"abs_mag_band":"V","distance_ly":962.1133692768688,"distance_method":"parallax","ra_deg":7.88055,"dec_deg":21.110249,"epoch_ra_deg":8.231976,"epoch_dec_deg":21.258619,"epoch_moved_arcsec":0.569,"pm_ra_mas_yr":20.55,"pm_dec_mas_yr":5.72,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Pisces","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-2778","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"spectral_type":"K5","color_index_bv":1.606,"luminosity_solar":77.19692476102512,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1993yCat.3135....0C, quality E)","proper_motion_ra_mas_yr":20.55,"proper_motion_dec_mas_yr":5.72},"designations":[{"catalog":"HD","designation":"HD 2778"},{"catalog":"HIP","designation":"HIP 2481"}],"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."}