{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.678","julian_year":2026.678,"time":"2026-09-05T17:13:22.470Z","years_from_j2000":26.678,"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":"k2-370-b","name":"K2-370 b","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":470.3240197950983,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":67.8205302,"dec_deg":19.8316901,"epoch_ra_deg":68.214475,"epoch_dec_deg":19.889789,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"K2-370","semi_major_axis_km":4802091.649469999,"periapsis_km":null,"mass_kg":6.629106333248431e+25,"mass_msun":0.0000333387,"constellation":"Taurus","discovered":"2022","featured":false,"url":"https://spacecatalog.org/object/k2-370-b","radius_km":17029.527000000002,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"K2-370","host_v_mag":11.109,"eccentricity":0,"uncertainties":{"mass_kg":[8.361035014907931e+24,8.958251801687069e+24],"radius_km":[318.90500000000003,318.90500000000003],"distance_ly":[3.845383693280405,3.907353405046586],"host_mass_solar":[0.038,0.035],"inclination_deg":[0.23,0.23],"host_radius_solar":[0.008,0.008],"host_temperature_k":[44,44],"semi_major_axis_km":[64327.08440099999,59839.14828],"orbital_period_days":[0.0000012,0.0000012]},"host_mass_solar":0.962,"inclination_deg":84.44,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.945,"planets_in_system":1,"discovery_facility":"K2","host_spectral_type":"G5 V","host_temperature_k":5662,"orbital_period_days":2.1408093,"transit_midpoint_bjd":2457860.71859,"equilibrium_temperature_k":1267,"argument_of_periastron_deg":90},"designations":[{"catalog":"Exoplanet","designation":"K2-370 b"},{"catalog":"Host star","designation":"K2-370"}],"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."}