{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.680","julian_year":2026.68,"time":"2026-09-06T11:49:31.636Z","years_from_j2000":26.68,"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":"sr-12-ab-c","name":"SR 12 AB c","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":366.3297627360404,"distance_method":"NASA Exoplanet Archive sy_dist (Gaia DR2, 2018A&A...616A...1G)","ra_deg":246.8312363,"dec_deg":-24.6946687,"epoch_ra_deg":247.23844,"epoch_dec_deg":-24.755132,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"SR 12 AB","semi_major_axis_km":null,"periapsis_km":null,"mass_kg":2.467472820592422e+28,"mass_msun":0.0124093,"constellation":"Ophiuchus","discovered":"2010","featured":false,"url":"https://spacecatalog.org/object/sr-12-ab-c","radius_km":78450.63,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"SR 12 AB","host_v_mag":13.355,"uncertainties":{"mass_kg":[1.3286401298832835e+28,1.3286401298832835e+28],"distance_ly":[17.643376415254046,17.643376415254046],"host_radius_solar":[0.246398,0.255621],"host_temperature_k":[378.93,515.89]},"stars_in_system":2,"discovery_method":"Imaging","host_radius_solar":1.103075,"planets_in_system":1,"discovery_facility":"Infrared Survey Facility","host_temperature_k":3828.93},"designations":[{"catalog":"Exoplanet","designation":"SR 12 AB c"},{"catalog":"Host star","designation":"SR 12 AB"}],"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."}