{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.671","julian_year":2026.671,"time":"2026-09-02T22:20:40.632Z","years_from_j2000":26.671,"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":"k2-72-b","name":"K2-72 b","class":"terrestrial_planet","category":"exoplanet","object_type":"Terrestrial planet","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":216.6725310011647,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":334.6227504,"dec_deg":-9.6120084,"epoch_ra_deg":334.977829,"epoch_dec_deg":-9.477734,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"K2-72","semi_major_axis_km":5983914.828,"periapsis_km":null,"mass_kg":7.644374870772965e+24,"mass_msun":0.00000384447,"constellation":"Aquarius","discovered":"2016","featured":false,"url":"https://spacecatalog.org/object/k2-72-b","radius_km":6888.348000000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"K2-72","host_v_mag":15.37,"eccentricity":0.11,"uncertainties":{"radius_km":[701.591,701.591],"distance_ly":[0.6493773480340361,0.6532912245666371],"eccentricity":[0.087659,0.196982],"host_mass_solar":[0.090624,0.079196],"inclination_deg":[0.86,0.59],"host_radius_solar":[0.029936,0.030366],"host_temperature_k":[86.34,87.24],"semi_major_axis_km":[747989.3535,598391.4828],"orbital_period_days":[0.000419,0.000417],"argument_of_periastron_deg":[134.041,119.6642]},"host_mass_solar":0.271365,"inclination_deg":89.15,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.330989,"planets_in_system":4,"discovery_facility":"K2","host_temperature_k":3360.47,"orbital_period_days":5.577212,"transit_midpoint_bjd":2457010.376,"equilibrium_temperature_k":466.13,"argument_of_periastron_deg":7.49},"designations":[{"catalog":"Exoplanet","designation":"K2-72 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."}