{"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":"2026-09-05T13:13:57.738Z","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":"tic-279401253-c","name":"TIC 279401253 c","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":931.4504297385845,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":57.6572277,"dec_deg":-15.0262251,"epoch_ra_deg":57.967834,"epoch_dec_deg":-14.944632,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"TIC 279401253","semi_major_axis_km":88412341.58369999,"periapsis_km":null,"mass_kg":1.5222959290048898e+28,"mass_msun":0.00765585,"constellation":"Eridanus","discovered":"2023","featured":false,"url":"https://spacecatalog.org/object/tic-279401253-c","radius_km":80364.06,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"TIC 279401253","host_v_mag":11.938,"eccentricity":0.254,"uncertainties":{"mass_kg":[3.4166242795620975e+26,3.4166242795620975e+26],"distance_ly":[8.930161621884436,9.099762938297141],"eccentricity":[0.036,0.042],"host_mass_solar":[0.03,0.02],"host_radius_solar":[0.01,0.01],"host_temperature_k":[80,80],"semi_major_axis_km":[897587.2241999999,747989.3535],"orbital_period_days":[0.7,0.7],"argument_of_periastron_deg":[8.1,7.9]},"host_mass_solar":1.13,"inclination_deg":90,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.06,"planets_in_system":2,"discovery_facility":"Multiple Observatories","host_temperature_k":5951,"orbital_period_days":155.3,"equilibrium_temperature_k":384.31,"argument_of_periastron_deg":120.9},"designations":[{"catalog":"Exoplanet","designation":"TIC 279401253 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."}