{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.685","julian_year":2026.685,"time":"2026-09-08T08:29:34.103Z","years_from_j2000":26.685,"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":"roxs-42-b-b","name":"ROXs 42 B b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":468.32794276347187,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":247.8125493,"dec_deg":-24.545577,"epoch_ra_deg":248.219879,"epoch_dec_deg":-24.60372,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"ROXs 42 B","semi_major_axis_km":23486865699.899998,"periapsis_km":null,"mass_kg":1.7080400101883345e+28,"mass_msun":0.00858998,"constellation":"Ophiuchus","discovered":"2013","featured":false,"url":"https://spacecatalog.org/object/roxs-42-b-b","radius_km":79726.25,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"ROXs 42 B","host_v_mag":14.661,"uncertainties":{"mass_kg":[5.691475978005184e+27,5.691475978005184e+27],"distance_ly":[4.928222867299993,5.029331344392183],"host_temperature_k":[123,123]},"host_mass_solar":1,"stars_in_system":2,"discovery_method":"Imaging","host_radius_solar":1.33658,"planets_in_system":1,"discovery_facility":"Multiple Observatories","host_spectral_type":"M0","host_temperature_k":3433,"eccentricity_upper_limit":0.58,"equilibrium_temperature_k":1975},"designations":[{"catalog":"Exoplanet","designation":"ROXs 42 B b"},{"catalog":"Host star","designation":"ROXs 42 B"}],"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."}