{"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":"2026-09-05T19:55:29.381Z","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-55122","name":"HIP 55122","class":"b8_blue_white_star","category":"star","object_type":"B8 blue-white star","mag":10,"mag_band":"V","abs_mag":3.873,"abs_mag_band":"V","distance_ly":548.1618916499547,"distance_method":"parallax","ra_deg":169.288725,"dec_deg":7.745555,"epoch_ra_deg":169.636808,"epoch_dec_deg":7.598965,"epoch_moved_arcsec":0.27,"pm_ra_mas_yr":-10.01,"pm_dec_mas_yr":1.56,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Leo","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hip-55122","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"11172+0745","age_years":1569516100,"companions":[{"measured":2015,"magnitude":12.51,"components":null,"discoverer_code":"HDS1609","separation_arcsec":0.9,"position_angle_deg":198}],"mass_solar":1.582,"radius_solar":2.076,"spectral_type":"B8","color_index_bv":0.35,"luminosity_solar":2.4592348238462303,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (quality D)","surface_gravity_log_g":3.944,"surface_temperature_k":6887,"proper_motion_ra_mas_yr":-10.01,"proper_motion_dec_mas_yr":1.56,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":8.6138},"designations":[{"catalog":"HIP","designation":"HIP 55122"}],"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."}