{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.684","julian_year":2026.684,"time":"2026-09-07T21:35:44.954Z","years_from_j2000":26.684,"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":"tania-australis","name":"Tania Australis","class":"m0iii_red_giant","category":"star","object_type":"M0III red giant","mag":3.06,"mag_band":"V","abs_mag":-1.185,"abs_mag_band":"V","distance_ly":230.33652628922994,"distance_method":"parallax","ra_deg":155.582325,"dec_deg":41.499516,"epoch_ra_deg":155.981817,"epoch_dec_deg":41.364293,"epoch_moved_arcsec":2.332,"pm_ra_mas_yr":-80.47,"pm_dec_mas_yr":34.1,"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/tania-australis","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"spectral_type":"M0III","color_index_bv":1.603,"luminosity_solar":259.4179362118815,"metallicity_fe_h":0,"radial_velocity_km_s":-21,"spectral_type_source":"SIMBAD (1989ApJS...71..245K, quality B)","surface_gravity_log_g":1.35,"surface_temperature_k":3700,"metallicity_fe_h_source":"One spectroscopic determination, compiled from the literature (PASTEL, Soubiran+ 2016)","proper_motion_ra_mas_yr":-80.47,"proper_motion_dec_mas_yr":34.1,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"Bayer/Flamsteed","designation":"34 Mu UMa"},{"catalog":"Common name","designation":"Tania Australis"},{"catalog":"HD","designation":"HD 89758"},{"catalog":"HIP","designation":"HIP 50801"},{"catalog":"HR","designation":"HR 4069"}],"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."}