{"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":"2026-09-02T22:19:11.913Z","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":"gj-357-c","name":"GJ 357 c","class":"super_earth","category":"exoplanet","object_type":"Super-Earth","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":30.795065486897254,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":144.0074644,"dec_deg":-21.6650634,"epoch_ra_deg":144.315875,"epoch_dec_deg":-21.784895,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"GJ 357","semi_major_axis_km":9125470.112699999,"periapsis_km":null,"mass_kg":2.030537075049069e+25,"mass_msun":0.0000102119,"constellation":"Hydra","discovered":"2019","featured":false,"url":"https://spacecatalog.org/object/gj-357-c","radius_km":10587.646,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"GJ 357","host_v_mag":10.91,"uncertainties":{"mass_kg":[2.7471972191840344e+24,2.7471972191840344e+24],"distance_ly":[0.01666659090132559,0.01666659090132559],"host_mass_solar":[0.011,0.011],"host_radius_solar":[0.015,0.015],"host_temperature_k":[51,51],"semi_major_axis_km":[598391.4828,598391.4828],"orbital_period_days":[0.001,0.0011]},"host_mass_solar":0.342,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":0.337,"planets_in_system":3,"discovery_facility":"Multiple Observatories","host_spectral_type":"M2.5 V","host_temperature_k":3505,"orbital_period_days":9.1247,"equilibrium_temperature_k":401.2},"designations":[{"catalog":"Exoplanet","designation":"GJ 357 c"}],"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."}