{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.682","julian_year":2026.682,"time":"2026-09-06T22:41:38.916Z","years_from_j2000":26.682,"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-219828-c","name":"HD 219828 c","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":238.4659740038198,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":349.6947029,"dec_deg":18.6457524,"epoch_ra_deg":350.029245,"epoch_dec_deg":18.792581,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 219828","semi_major_axis_km":846275154.5498999,"periapsis_km":null,"mass_kg":3.0472492324506337e+28,"mass_msun":0.0153251,"constellation":"Pegasus","discovered":"2016","featured":false,"url":"https://spacecatalog.org/object/hd-219828-c","radius_km":77812.82,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 219828","host_v_mag":8.04,"eccentricity":0.811,"uncertainties":{"mass_kg":[2.4106182416910353e+27,6.681398591143657e+27],"distance_ly":[1.1532889516064049,1.164378268448774],"eccentricity":[0.004,0.004],"host_mass_solar":[0.124,0.124],"inclination_deg":[69.974,11.012],"host_radius_solar":[0.04,0.04],"host_temperature_k":[18,18],"semi_major_axis_km":[36202684.7094,34108314.5196],"orbital_period_days":[80.73006,90.67081],"argument_of_periastron_deg":[0.311,0.309]},"host_mass_solar":1.04,"inclination_deg":122.816,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":1.56,"planets_in_system":2,"discovery_facility":"Multiple Facilities","host_spectral_type":"G0 IV","host_temperature_k":5891,"orbital_period_days":4789.87297,"periastron_epoch_bjd":2449391.191,"equilibrium_temperature_k":149.17,"argument_of_periastron_deg":145.683},"designations":[{"catalog":"Exoplanet","designation":"HD 219828 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."}