{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.677","julian_year":2026.677,"time":"2026-09-05T07:54:00.456Z","years_from_j2000":26.677,"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-d","name":"TOI-270 d","class":"neptune_like_planet","category":"exoplanet","object_type":"Neptune-like planet","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":68.583675,"epoch_dec_deg":-51.900461,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"TOI-270","semi_major_axis_km":10786006.47747,"periapsis_km":null,"mass_kg":2.5083105044723793e+25,"mass_msun":0.0000126147,"constellation":"Pictor","discovered":"2019","featured":false,"url":"https://spacecatalog.org/object/toi-270-d","radius_km":12756.2,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"TOI-270","host_v_mag":12.603,"eccentricity":0.0066,"uncertainties":{"mass_kg":[9.555468588466207e+23,9.555468588466207e+23],"radius_km":[318.90500000000003,318.90500000000003],"distance_ly":[0.04419418918061873,0.04419418918061873],"eccentricity":[0.002,0.002],"host_mass_solar":[0.008,0.008],"inclination_deg":[0.12,0.12],"host_radius_solar":[0.008,0.008],"host_temperature_k":[70,70],"semi_major_axis_km":[74798.93535,74798.93535],"orbital_period_days":[0.00011,0.00011],"argument_of_periastron_deg":[90,90]},"host_mass_solar":0.386,"inclination_deg":89.68,"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":11.38194,"transit_midpoint_bjd":2458469.33823,"equilibrium_temperature_k":383,"argument_of_periastron_deg":-6},"designations":[{"catalog":"Exoplanet","designation":"TOI-270 d"}],"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."}