{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.683","julian_year":2026.683,"time":"2026-09-07T13:24:41.010Z","years_from_j2000":26.683,"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-849-c","name":"GJ 849 c","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":28.703652946064178,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":332.4229938,"dec_deg":-4.6408317,"epoch_ra_deg":332.772924,"epoch_dec_deg":-4.509094,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"GJ 849","semi_major_axis_km":740509459.9649999,"periapsis_km":null,"mass_kg":1.8791433537591535e+27,"mass_msun":0.000945048,"constellation":"Aquarius","discovered":"2014","featured":false,"url":"https://spacecatalog.org/object/gj-849-c","radius_km":88017.78000000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"GJ 849","host_v_mag":10.41,"eccentricity":0.092,"uncertainties":{"mass_kg":[2.0879370597323927e+26,2.0879370597323927e+26],"distance_ly":[0.011790553054460275,0.011790553054460275],"eccentricity":[0.036,0.038],"host_mass_solar":[0.07,0.07],"host_radius_solar":[0.07,0.07],"host_temperature_k":[68,68],"semi_major_axis_km":[41887403.796000004,37399467.675],"orbital_period_days":[100,110],"argument_of_periastron_deg":[23,25]},"host_mass_solar":0.45,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":0.45,"planets_in_system":2,"discovery_facility":"W. M. Keck Observatory","host_spectral_type":"M3.5","host_temperature_k":3467,"orbital_period_days":5990,"transit_midpoint_bjd":2453120,"equilibrium_temperature_k":50.41,"argument_of_periastron_deg":143},"designations":[{"catalog":"Exoplanet","designation":"GJ 849 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."}