{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.669","julian_year":2026.669,"time":"2026-09-02T11:55:15.706Z","years_from_j2000":26.669,"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-101-b","name":"Kepler-101 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":3026.6692154996126,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":283.255507,"dec_deg":48.3552474,"epoch_ra_deg":283.435274,"epoch_dec_deg":48.387506,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-101","semi_major_axis_km":7090939.071179999,"periapsis_km":null,"mass_kg":3.051777780441395e+26,"mass_msun":0.000153478,"constellation":"Draco","discovered":"2014","featured":false,"url":"https://spacecatalog.org/object/kepler-101-b","radius_km":36801.637,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-101","host_v_mag":13.7,"eccentricity":0.086,"uncertainties":{"mass_kg":[2.8069188978619484e+25,3.045805612573603e+25],"radius_km":[5038.6990000000005,5421.385],"distance_ly":[48.26625155641228,48.26625155641228],"eccentricity":[0.059,0.08],"host_mass_solar":[0.05,0.07],"inclination_deg":[1.53,1.73],"host_radius_solar":[0.2,0.2],"host_temperature_k":[50,50],"semi_major_axis_km":[119678.29656,149597.8707],"orbital_period_days":[0.000007,0.000007],"argument_of_periastron_deg":[90,32]},"host_mass_solar":1.17,"inclination_deg":85.82,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.56,"planets_in_system":2,"discovery_facility":"Kepler","host_spectral_type":"G3 IV","host_temperature_k":5667,"orbital_period_days":3.4876812,"transit_midpoint_bjd":2455088.77995,"equilibrium_temperature_k":1513,"argument_of_periastron_deg":231},"designations":[{"catalog":"Exoplanet","designation":"Kepler-101 b"}],"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":"2026-09-01T22:58:55.274Z","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."}