{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.686","julian_year":2026.686,"time":"2026-09-08T17:11:07.540Z","years_from_j2000":26.686,"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":"epic-229004835-b","name":"EPIC 229004835 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":397.8161954648891,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":186.4860415,"dec_deg":-1.4047214,"epoch_ra_deg":186.830732,"epoch_dec_deg":-1.553581,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"EPIC 229004835","semi_major_axis_km":18505256.60559,"periapsis_km":null,"mass_kg":6.211054582503034e+25,"mass_msun":0.0000312363,"constellation":"Virgo","discovered":"2023","featured":false,"url":"https://spacecatalog.org/object/epic-229004835-b","radius_km":14873.7292,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"EPIC 229004835","host_v_mag":10.23,"uncertainties":{"mass_kg":[8.958251801687069e+24,9.555468588466207e+24],"radius_km":[599.5414000000001,510.24800000000005],"distance_ly":[2.824514231026998,2.8669145601301746],"host_mass_solar":[0.04,0.04],"inclination_deg":[0.24,0.26],"host_radius_solar":[0.008,0.008],"host_temperature_k":[60,60],"semi_major_axis_km":[254316.38018999997,254316.38018999997],"orbital_period_days":[0.000019,0.000019]},"host_mass_solar":0.97,"inclination_deg":88.08,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.999,"planets_in_system":1,"discovery_facility":"K2","host_temperature_k":5868,"orbital_period_days":16.141132,"transit_midpoint_bjd":2457920.44584,"eccentricity_upper_limit":0.23,"equilibrium_temperature_k":804},"designations":[{"catalog":"Exoplanet","designation":"EPIC 229004835 b"},{"catalog":"Host star","designation":"EPIC 229004835"}],"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."}