{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.682","julian_year":2026.682,"time":"2026-09-07T02:41:22.018Z","years_from_j2000":26.682,"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":"gj-411-b","name":"GJ 411 b","class":"super_earth","category":"exoplanet","object_type":"Super-Earth","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":18.51189562422494,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":165.834471,"dec_deg":35.972317,"epoch_ra_deg":166.206478,"epoch_dec_deg":35.82773,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"GJ 411","semi_major_axis_km":11786816.232453,"periapsis_km":null,"mass_kg":1.606513156435881e+25,"mass_msun":0.00000807939,"constellation":"Ursa Major","discovered":"2019","featured":false,"url":"https://spacecatalog.org/object/gj-411-b","radius_km":9248.245,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"GJ 411","host_v_mag":7.49,"eccentricity":0.063,"uncertainties":{"mass_kg":[1.0749902162024483e+24,1.134711894880362e+24],"distance_ly":[0.01927551576668182,0.01927551576668182],"eccentricity":[0.043,0.061],"host_mass_solar":[0.0061,0.0106],"host_radius_solar":[0.0054,0.0081],"host_temperature_k":[31,21],"semi_major_axis_km":[82278.828885,83774.80759199998],"orbital_period_days":[0.0013,0.0014],"argument_of_periastron_deg":[120,180]},"host_mass_solar":0.3899,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":0.3685,"planets_in_system":2,"discovery_facility":"Haute-Provence Observatory","host_spectral_type":"M1.5 V","host_temperature_k":3719,"orbital_period_days":12.9394,"periastron_epoch_bjd":2456307.8,"transit_midpoint_bjd":2456305.38,"equilibrium_temperature_k":349.83,"argument_of_periastron_deg":-30},"designations":[{"catalog":"Exoplanet","designation":"GJ 411 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."}