{"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":"2026-09-06T23:36:00.454Z","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":"k2-136-b","name":"K2-136 b","class":"terrestrial_planet","category":"exoplanet","object_type":"Terrestrial planet","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":193.23917373134984,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":67.4128615,"dec_deg":22.8825674,"epoch_ra_deg":67.815176,"epoch_dec_deg":22.941653,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"K2-136","semi_major_axis_km":10576569.45849,"periapsis_km":null,"mass_kg":2.568032183150293e+25,"mass_msun":0.000012915,"constellation":"Taurus","discovered":"2017","featured":false,"url":"https://spacecatalog.org/object/k2-136-b","radius_km":6467.393400000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"K2-136","host_v_mag":11.101,"eccentricity":0.14,"uncertainties":{"radius_km":[312.5269,318.90500000000003],"distance_ly":[0.6082816444417265,0.6121955209743274],"eccentricity":[0.11,0.12],"host_mass_solar":[0.038,0.039],"inclination_deg":[0.6,0.6],"host_radius_solar":[0.027,0.027],"host_temperature_k":[75,125],"semi_major_axis_km":[179517.44483999998,179517.44483999998],"orbital_period_days":[0.00073,0.00073],"argument_of_periastron_deg":[132,82]},"host_mass_solar":0.742,"inclination_deg":89.2,"stars_in_system":2,"discovery_method":"Transit","host_radius_solar":0.677,"planets_in_system":3,"discovery_facility":"K2","host_spectral_type":"K5.5","host_temperature_k":4500,"orbital_period_days":7.97525,"transit_midpoint_bjd":2458679.083,"equilibrium_temperature_k":610,"argument_of_periastron_deg":189},"designations":[{"catalog":"Exoplanet","designation":"K2-136 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."}