{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.676","julian_year":2026.676,"time":"2026-09-04T22:33:38.730Z","years_from_j2000":26.676,"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":"k2-29-b","name":"K2-29 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":582.1075951299578,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":62.670422,"dec_deg":24.4016558,"epoch_ra_deg":63.074537,"epoch_dec_deg":24.47187,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"K2-29","semi_major_axis_km":6308542.207419,"periapsis_km":null,"mass_kg":1.385637902796698e+27,"mass_msun":0.000696857,"constellation":"Taurus","discovered":"2016","featured":false,"url":"https://spacecatalog.org/object/k2-29-b","radius_km":85075.62625100001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"K2-29","host_v_mag":12.532,"eccentricity":0.066,"uncertainties":{"mass_kg":[7.592536453680536e+25,7.592536453680536e+25],"radius_km":[1429.842458,1429.842458],"distance_ly":[4.2432944740948315,4.305264185861013],"eccentricity":[0.022,0.022],"host_mass_solar":[0.02,0.02],"inclination_deg":[0.08,0.11],"host_radius_solar":[0.01,0.01],"host_temperature_k":[38,38],"semi_major_axis_km":[35903.488968,35903.488968],"orbital_period_days":[0.0000019,0.0000019],"argument_of_periastron_deg":[21,21]},"host_mass_solar":0.94,"inclination_deg":86.656,"stars_in_system":2,"discovery_method":"Transit","host_radius_solar":0.86,"planets_in_system":1,"discovery_facility":"K2","host_spectral_type":"G7 V","host_temperature_k":5358,"orbital_period_days":3.2588321,"periastron_epoch_bjd":2457383.43,"transit_midpoint_bjd":2453219.0095,"equilibrium_temperature_k":1171,"argument_of_periastron_deg":132},"designations":[{"catalog":"Exoplanet","designation":"K2-29 b"},{"catalog":"Host star","designation":"K2-29"}],"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."}