{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.684","julian_year":2026.684,"time":"2026-09-07T22:13:33.869Z","years_from_j2000":26.684,"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":"hd-115404-a-c","name":"HD 115404 A c","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":35.8171887753419,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":199.2155793,"dec_deg":17.0160384,"epoch_ra_deg":199.545391,"epoch_dec_deg":16.874162,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 115404 A","semi_major_axis_km":1700030202.6348,"periapsis_km":null,"mass_kg":1.9586747744871683e+28,"mass_msun":0.00985046,"constellation":"Coma Berenices","discovered":"2022","featured":false,"url":"https://spacecatalog.org/object/hd-115404-a-c","radius_km":79726.25,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 115404 A","host_v_mag":6.50066,"eccentricity":0.211,"uncertainties":{"mass_kg":[2.2948326410879587e+27,2.7959375354356775e+27],"distance_ly":[0.014350880619536712,0.014350880619536712],"eccentricity":[0.102,0.173],"host_mass_solar":[0.102,0.102],"inclination_deg":[2.157,1.842],"host_radius_solar":[0.042582,0.066523],"host_temperature_k":[179.14,117.04],"semi_major_axis_km":[284983943.6835,493822571.1807],"orbital_period_days":[3541.36457,7240.32595],"argument_of_periastron_deg":[22.215,40.969]},"host_mass_solar":0.83,"inclination_deg":25.791,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":0.727007,"planets_in_system":2,"discovery_facility":"Multiple Observatories","host_spectral_type":"K2V","host_temperature_k":5019.17,"orbital_period_days":15319.22517,"periastron_epoch_bjd":2441172.404,"equilibrium_temperature_k":61.22,"argument_of_periastron_deg":312.056},"designations":[{"catalog":"Exoplanet","designation":"HD 115404 A c"},{"catalog":"Host star","designation":"HD 115404 A"}],"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."}