{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.669","julian_year":2026.669,"time":"2026-09-02T05:52:11.097Z","years_from_j2000":26.669,"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-890","name":"HIP 890","class":"b0_blue_white_star","category":"star","object_type":"B0: blue-white star","mag":9.64,"mag_band":"V","abs_mag":1.899,"abs_mag_band":"V","distance_ly":1152.4960654521753,"distance_method":"parallax","ra_deg":2.73345,"dec_deg":64.963177,"epoch_ra_deg":3.088771,"epoch_dec_deg":65.112551,"epoch_moved_arcsec":0.093,"pm_ra_mas_yr":-2.11,"pm_dec_mas_yr":-2.77,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Cassiopeia","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hip-890","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"radius_solar":25.844,"spectral_type":"B0:","color_index_bv":0.56,"luminosity_solar":15.149559320403432,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (quality D)","surface_gravity_log_g":2.74,"surface_temperature_k":17041,"proper_motion_ra_mas_yr":-2.11,"proper_motion_dec_mas_yr":-2.77,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4) — low confidence: above 7,500 K GSP-Phot's temperature and extinction are degenerate"},"designations":[{"catalog":"HIP","designation":"HIP 890"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-09-01T22:58:55.274Z","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."}