{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.672","julian_year":2026.672,"time":"2026-09-03T12:58:56.024Z","years_from_j2000":26.672,"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":"gl-49-b","name":"Gl 49 b","class":"neptune_like_planet","category":"exoplanet","object_type":"Neptune-like planet","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":32.1355355836753,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":15.6687321,"dec_deg":62.3454386,"epoch_ra_deg":16.086848,"epoch_dec_deg":62.489854,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Gl 49","semi_major_axis_km":13538607.298349999,"periapsis_km":null,"mass_kg":3.3623305095665466e+25,"mass_msun":0.0000169096,"constellation":"Cassiopeia","discovered":"2019","featured":false,"url":"https://spacecatalog.org/object/gl-49-b","radius_km":14286.944000000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Gl 49","host_v_mag":9.56,"eccentricity":0.363,"uncertainties":{"mass_kg":[4.0610741500981384e+24,4.001352471420224e+24],"distance_ly":[0.010697929189109183,0.010697929189109183],"eccentricity":[0.096,0.099],"host_mass_solar":[0.019,0.019],"host_radius_solar":[0.018,0.018],"host_temperature_k":[51,51],"semi_major_axis_km":[164557.65777,164557.65777],"orbital_period_days":[0.0051,0.0053],"argument_of_periastron_deg":[21,21]},"host_mass_solar":0.515,"stars_in_system":2,"discovery_method":"Radial Velocity","host_radius_solar":0.511,"planets_in_system":1,"discovery_facility":"Multiple Observatories","host_spectral_type":"M1.5 V","host_temperature_k":3805,"orbital_period_days":13.8508,"periastron_epoch_bjd":2455995.88,"equilibrium_temperature_k":435.99,"argument_of_periastron_deg":43},"designations":[{"catalog":"Exoplanet","designation":"Gl 49 b"},{"catalog":"Host star","designation":"Gl 49"}],"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."}