{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.665","julian_year":2026.665,"time":"2026-08-31T17:16:12.958Z","years_from_j2000":26.665,"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-55352","name":"HIP 55352","class":"star","category":"star","object_type":null,"mag":11.09,"mag_band":"V","abs_mag":7.022,"abs_mag_band":"V","distance_ly":212.34150046146408,"distance_method":"parallax","ra_deg":170.01897,"dec_deg":8.391319,"epoch_ra_deg":170.367539,"epoch_dec_deg":8.243795,"epoch_moved_arcsec":3.027,"pm_ra_mas_yr":72.46,"pm_dec_mas_yr":-87.38,"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-55352","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"age_years":203076100,"mass_solar":0.863,"radius_solar":0.757,"luminosity_solar":0.1352695359013038,"variable_mag_max":11.004,"variable_mag_min":11.144,"radial_velocity_km_s":0,"surface_gravity_log_g":4.592,"surface_temperature_k":5110,"proper_motion_ra_mas_yr":72.46,"proper_motion_dec_mas_yr":-87.38,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":0.3561},"designations":[{"catalog":"HIP","designation":"HIP 55352"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-08-30T09:56:50.739Z","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."}