{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.677","julian_year":2026.677,"time":"2026-09-05T09:04:17.248Z","years_from_j2000":26.677,"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-47620","name":"HIP 47620","class":"m2_5ve_red_dwarf","category":"star","object_type":"M2.5Ve red dwarf","mag":10.56,"mag_band":"V","abs_mag":10.112,"abs_mag_band":"V","distance_ly":40.082988039499185,"distance_method":"parallax","ra_deg":145.64831999999998,"dec_deg":70.033886,"epoch_ra_deg":146.212936,"epoch_dec_deg":69.909321,"epoch_moved_arcsec":19.274,"pm_ra_mas_yr":-670.68,"pm_dec_mas_yr":-268.66,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Ursa Major","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hip-47620","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"radius_solar":0.618,"spectral_type":"M2.5Ve","color_index_bv":1.463,"luminosity_solar":0.007855973322609887,"variable_mag_max":10.497,"variable_mag_min":10.647,"radial_velocity_km_s":6.9,"spectral_type_source":"SIMBAD (2013AJ....145..102L, quality C)","surface_gravity_log_g":4.033,"surface_temperature_k":3211,"proper_motion_ra_mas_yr":-670.68,"proper_motion_dec_mas_yr":-268.66,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":0.0328},"designations":[{"catalog":"Gliese","designation":"Gl 360"},{"catalog":"HIP","designation":"HIP 47620"}],"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."}