{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.674","julian_year":2026.674,"time":"2026-09-04T00:12:13.938Z","years_from_j2000":26.674,"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":"kepler-849-b","name":"Kepler-849 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":2681.4424743777713,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":290.8517961,"dec_deg":48.5213243,"epoch_ra_deg":291.036866,"epoch_dec_deg":48.572624,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-849","semi_major_axis_km":170092778.98589998,"periapsis_km":null,"mass_kg":1.7842371237713173e+27,"mass_msun":0.000897319,"constellation":"Cygnus","discovered":"2016","featured":false,"url":"https://spacecatalog.org/object/kepler-849-b","radius_km":51545.731827748,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-849","host_v_mag":12.878,"eccentricity":0.078,"uncertainties":{"mass_kg":[3.7962491995134415e+26,3.7962491995134415e+26],"radius_km":[2073.2679923640003,1930.284001688],"distance_ly":[51.268521013294894,53.271121172475695],"eccentricity":[0.053,0.069],"host_mass_solar":[0.098,0.12],"inclination_deg":[0.058,0.053],"host_radius_solar":[0.073,0.066],"host_temperature_k":[130,140],"semi_major_axis_km":[4487936.120999999,5086327.6038],"orbital_period_days":[0.00079,0.00081],"argument_of_periastron_deg":[61,53]},"host_mass_solar":1.259,"inclination_deg":89.923,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.822,"planets_in_system":1,"discovery_facility":"Kepler","host_temperature_k":5950,"orbital_period_days":394.62508,"periastron_epoch_bjd":2454835,"transit_midpoint_bjd":2455010.8377,"equilibrium_temperature_k":362.7,"argument_of_periastron_deg":-74},"designations":[{"catalog":"Exoplanet","designation":"Kepler-849 b"},{"catalog":"Host star","designation":"Kepler-849"}],"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."}