{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.687","julian_year":2026.687,"time":"2026-09-08T20:51:32.675Z","years_from_j2000":26.687,"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":"2mass-j01033563-5515561-ab-b","name":"2MASS J01033563-5515561 AB b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":153.94581028230292,"distance_method":"NASA Exoplanet Archive sy_dist (Delorme+ 2013, 2013A&A...553L...5D)","ra_deg":15.8992489,"dec_deg":-55.2658291,"epoch_ra_deg":16.187288,"epoch_dec_deg":-55.121413,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"2MASS J01033563-5515561 A","semi_major_axis_km":12566221138.8,"periapsis_km":null,"mass_kg":2.4675743474461744e+28,"mass_msun":0.0124098,"constellation":"Phoenix","discovered":"2013","featured":false,"url":"https://spacecatalog.org/object/2mass-j01033563-5515561-ab-b","radius_km":78450.63,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"2MASS J01033563-5515561 A","host_v_mag":15.788,"uncertainties":{"mass_kg":[1.898134113420134e+27,1.898134113420134e+27],"distance_ly":[10.110847709219046,10.110847709219046],"host_mass_solar":[0.02,0.02]},"host_mass_solar":0.19,"stars_in_system":2,"discovery_method":"Imaging","planets_in_system":1,"discovery_facility":"Paranal Observatory","host_spectral_type":"M5.5/M6"},"designations":[{"catalog":"Exoplanet","designation":"2MASS J01033563-5515561 AB b"},{"catalog":"Host star","designation":"2MASS J01033563-5515561 A"}],"source":{"id":"exoplanet_archive","name":"NASA Exoplanet Archive (Planetary Systems Composite Parameters)","url":"https://exoplanetarchive.ipac.caltech.edu/cgi-bin/TblView/nph-tblView?app=ExoTbls&config=PSCompPars","license":"Public domain (NASA)"},"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."}