{"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":"2026-09-02T06:03:04.666Z","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":"gj-887-e","name":"GJ 887 e","class":"terrestrial_planet","category":"exoplanet","object_type":"Terrestrial planet","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":10.720075207156151,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":346.5027573,"dec_deg":-35.8473489,"epoch_ra_deg":346.873177,"epoch_dec_deg":-35.702427,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"GJ 887","semi_major_axis_km":6238231.20819,"periapsis_km":null,"mass_kg":8.719365086975414e+24,"mass_msun":0.00000438509,"constellation":"Piscis Austrinus","discovered":"2026","featured":false,"url":"https://spacecatalog.org/object/gj-887-e","radius_km":7143.472000000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"GJ 887","host_v_mag":7.56,"uncertainties":{"mass_kg":[1.0749902162024483e+24,1.134711894880362e+24],"distance_ly":[0.0015981662508120426,0.0015981662508120426],"host_mass_solar":[0.049,0.049],"host_radius_solar":[0.022,0.022],"host_temperature_k":[86,86],"semi_major_axis_km":[224396.80604999998,209437.01898],"orbital_period_days":[0.00013,0.00014]},"host_mass_solar":0.495,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":0.468,"planets_in_system":4,"discovery_facility":"Multiple Observatories","host_spectral_type":"M1 V","host_temperature_k":3688,"orbital_period_days":4.4249,"transit_midpoint_bjd":2453488.05,"equilibrium_temperature_k":544},"designations":[{"catalog":"Exoplanet","designation":"GJ 887 e"}],"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."}