{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.681","julian_year":2026.681,"time":"2026-09-06T15:00:20.652Z","years_from_j2000":26.681,"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-41637","name":"HIP 41637","class":"orange_star","category":"star","object_type":"Orange star","mag":11.97,"mag_band":"V","abs_mag":8.373,"abs_mag_band":"V","distance_ly":170.94149296874468,"distance_method":"parallax","ra_deg":127.361505,"dec_deg":55.123308,"epoch_ra_deg":127.879405,"epoch_dec_deg":55.031394,"epoch_moved_arcsec":9.694,"pm_ra_mas_yr":156.02,"pm_dec_mas_yr":-328.11,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Lynx","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hip-41637","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"radius_solar":0.578,"color_index_bv":1.237,"luminosity_solar":0.03897624530977198,"variable_mag_max":11.836,"variable_mag_min":12.096,"radial_velocity_km_s":0,"surface_gravity_log_g":4.676,"surface_temperature_k":4198,"proper_motion_ra_mas_yr":156.02,"proper_motion_dec_mas_yr":-328.11,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":0.0936},"designations":[{"catalog":"HIP","designation":"HIP 41637"}],"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."}