{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.681","julian_year":2026.681,"time":"2026-09-06T13:33:15.715Z","years_from_j2000":26.681,"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":"k2-415-b","name":"K2-415 b","class":"terrestrial_planet","category":"exoplanet","object_type":"Terrestrial planet","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":71.16145080299451,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":137.2015437,"dec_deg":11.8622503,"epoch_ra_deg":137.567276,"epoch_dec_deg":11.75374,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"K2-415","semi_major_axis_km":4039142.5089,"periapsis_km":null,"mass_kg":4.479125900843535e+25,"mass_msun":0.0000225262,"constellation":"Cancer","discovered":"2023","featured":false,"url":"https://spacecatalog.org/object/k2-415-b","radius_km":6473.7715,"radius_kind":null,"data_quality":"The published mass and radius imply a density no material has. One of the two is likely an upper limit rather than a measurement.","description":null,"properties":{"host_star":"K2-415","host_v_mag":15.33,"uncertainties":{"radius_km":[32.528310000000005,325.2831],"distance_ly":[0.10013000795904023,0.10013000795904023],"host_mass_solar":[0.0041,0.0041],"inclination_deg":[0.41,0.41],"host_radius_solar":[0.0058,0.0058],"host_temperature_k":[53,53],"semi_major_axis_km":[34407.510260999996,34407.510260999996],"orbital_period_days":[0.0000027,0.0000027]},"host_mass_solar":0.1635,"inclination_deg":89.32,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.1965,"planets_in_system":1,"discovery_facility":"K2","host_spectral_type":"M5 V","host_temperature_k":3173,"orbital_period_days":4.0179694,"transit_midpoint_bjd":2458100.07116,"equilibrium_temperature_k":412.4},"designations":[{"catalog":"Exoplanet","designation":"K2-415 b"},{"catalog":"Host star","designation":"K2-415"}],"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."}