{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.679","julian_year":2026.679,"time":"2026-09-05T21:34:08.472Z","years_from_j2000":26.679,"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":"k2-105-b","name":"K2-105 b","class":"neptune_like_planet","category":"exoplanet","object_type":"Neptune-like planet","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":645.7537506776032,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":125.4202985,"dec_deg":13.4975122,"epoch_ra_deg":125.79388,"epoch_dec_deg":13.412305,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"K2-105","semi_major_axis_km":11907990.50772,"periapsis_km":null,"mass_kg":9.197138516398724e+25,"mass_msun":0.0000462537,"constellation":"Cancer","discovered":"2017","featured":false,"url":"https://spacecatalog.org/object/k2-105-b","radius_km":21685.54,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"K2-105","host_v_mag":11.752,"eccentricity":0,"uncertainties":{"mass_kg":[2.627753861828207e+25,2.627753861828207e+25],"radius_km":[318.90500000000003,765.3720000000001],"distance_ly":[4.990192579066174,5.07173167349536],"host_mass_solar":[0.04,0.04],"inclination_deg":[0.1,0.1],"host_radius_solar":[0.035,0.035],"host_temperature_k":[100,100],"semi_major_axis_km":[104718.50949,104718.50949],"orbital_period_days":[0.00018,0.00018]},"host_mass_solar":0.94,"inclination_deg":88.62,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.905,"planets_in_system":1,"discovery_facility":"K2","host_spectral_type":"K1","host_temperature_k":5373,"orbital_period_days":8.26726,"transit_midpoint_bjd":2457147.98867,"equilibrium_temperature_k":805,"argument_of_periastron_deg":90},"designations":[{"catalog":"Exoplanet","designation":"K2-105 b"},{"catalog":"Host star","designation":"K2-105"}],"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."}