{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.678","julian_year":2026.678,"time":"2026-09-05T11:45:09.027Z","years_from_j2000":26.678,"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":"g-9-40-b","name":"G 9-40 b","class":"super_earth","category":"exoplanet","object_type":"Super-Earth","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":91.08764854322123,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":134.7188514,"dec_deg":21.0747961,"epoch_ra_deg":135.104323,"epoch_dec_deg":20.970843,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"G 9-40","semi_major_axis_km":6253190.995259999,"periapsis_km":null,"mass_kg":2.3888671471165517e+25,"mass_msun":0.000012014,"constellation":"Cancer","discovered":"2019","featured":false,"url":"https://spacecatalog.org/object/g-9-40-b","radius_km":12118.39,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"G 9-40","host_v_mag":13.821,"eccentricity":0,"uncertainties":{"mass_kg":[3.762465756708569e+24,3.762465756708569e+24],"radius_km":[414.5765,414.5765],"distance_ly":[0.14677036997253454,0.14709652635025128],"host_mass_solar":[0.0136,0.0136],"inclination_deg":[0.1,0.1],"host_radius_solar":[0.0095,0.0095],"host_temperature_k":[51,51],"semi_major_axis_km":[95742.637248,95742.637248],"orbital_period_days":[0.000002,0.000002]},"host_mass_solar":0.2952,"inclination_deg":89.03,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.3026,"planets_in_system":1,"discovery_facility":"K2","host_spectral_type":"M2.5 V","host_temperature_k":3395,"orbital_period_days":5.7459982,"transit_midpoint_bjd":2459503.32682,"equilibrium_temperature_k":440.6,"argument_of_periastron_deg":90},"designations":[{"catalog":"Exoplanet","designation":"G 9-40 b"},{"catalog":"Host star","designation":"G 9-40"}],"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."}