{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.686","julian_year":2026.686,"time":"2026-09-08T10:55:28.801Z","years_from_j2000":26.686,"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":"toi-270-b","name":"TOI-270 b","class":"super_earth","category":"exoplanet","object_type":"Super-Earth","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":73.3176706160799,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":68.4160804,"dec_deg":-51.9573937,"epoch_ra_deg":68.58376,"epoch_dec_deg":-51.900414,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"TOI-270","semi_major_axis_km":4782643.926278999,"periapsis_km":null,"mass_kg":8.838808444331241e+24,"mass_msun":0.00000444516,"constellation":"Pictor","discovered":"2019","featured":false,"url":"https://spacecatalog.org/object/toi-270-b","radius_km":8163.968000000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"TOI-270","host_v_mag":12.603,"eccentricity":0.0167,"uncertainties":{"mass_kg":[1.0749902162024483e+24,1.0749902162024483e+24],"radius_km":[255.12400000000002,318.90500000000003],"distance_ly":[0.04419418918061873,0.04419418918061873],"eccentricity":[0.0089,0.0084],"host_mass_solar":[0.008,0.008],"inclination_deg":[0.37,0.37],"host_radius_solar":[0.008,0.008],"host_temperature_k":[70,70],"semi_major_axis_km":[32911.531554,32911.531554],"orbital_period_days":[0.00005,0.00005],"argument_of_periastron_deg":[103,103]},"host_mass_solar":0.386,"inclination_deg":89.39,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.38,"planets_in_system":3,"discovery_facility":"Transiting Exoplanet Survey Satellite (TESS)","host_spectral_type":"M3 V","host_temperature_k":3506,"orbital_period_days":3.35992,"transit_midpoint_bjd":2458461.01464,"equilibrium_temperature_k":600,"argument_of_periastron_deg":0},"designations":[{"catalog":"Exoplanet","designation":"TOI-270 b"},{"catalog":"Host star","designation":"TOI-270"}],"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."}