{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.671","julian_year":2026.671,"time":"2026-09-02T22:54:24.813Z","years_from_j2000":26.671,"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":"k2-285-c","name":"K2-285 c","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":505.4151844736428,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":349.3843458,"dec_deg":1.3001522,"epoch_ra_deg":349.727669,"epoch_dec_deg":1.446739,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"K2-285","semi_major_axis_km":12326864.54568,"periapsis_km":null,"mass_kg":9.364359216696883e+25,"mass_msun":0.0000470947,"constellation":"Pisces","discovered":"2018","featured":false,"url":"https://spacecatalog.org/object/k2-285-c","radius_km":22514.693,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"K2-285","host_v_mag":12.075,"eccentricity":0,"uncertainties":{"mass_kg":[1.2720717558395637e+25,1.3616542738564342e+25],"radius_km":[510.24800000000005,510.24800000000005],"distance_ly":[3.7312289610795446,3.7866755452913914],"host_mass_solar":[0.023,0.023],"inclination_deg":[0.0012,0.0012],"host_radius_solar":[0.016,0.016],"host_temperature_k":[95,95],"semi_major_axis_km":[269276.16725999996,269276.16725999996],"orbital_period_days":[0.000063,0.000072]},"host_mass_solar":0.83,"inclination_deg":89.861,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.787,"planets_in_system":4,"discovery_facility":"K2","host_spectral_type":"K2 V","host_temperature_k":4975,"orbital_period_days":7.138048,"transit_midpoint_bjd":2457744.53906,"equilibrium_temperature_k":741.4},"designations":[{"catalog":"Exoplanet","designation":"K2-285 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."}