{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.685","julian_year":2026.685,"time":"2026-09-08T04:50:24.509Z","years_from_j2000":26.685,"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":"lp-890-9-c","name":"LP 890-9 c","class":"super_earth","category":"exoplanet","object_type":"Super-Earth","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":105.77186098078445,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":64.1309096,"dec_deg":-28.3157909,"epoch_ra_deg":64.403228,"epoch_dec_deg":-28.248761,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"LP 890-9","semi_major_axis_km":5959979.168687999,"periapsis_km":null,"mass_kg":1.510958470551219e+26,"mass_msun":0.0000759883,"constellation":"Eridanus","discovered":"2022","featured":false,"url":"https://spacecatalog.org/object/lp-890-9-c","radius_km":8718.8627,"radius_kind":null,"data_quality":"The published mass and radius imply a density no material has. One of the two is likely an upper limit rather than a measurement.","description":null,"properties":{"host_star":"LP 890-9","host_v_mag":18,"uncertainties":{"radius_km":[248.7459,350.7955],"distance_ly":[0.22798330802400366,0.22896177715715388],"host_mass_solar":[0.002,0.002],"inclination_deg":[0.047,0.026],"host_radius_solar":[0.0086,0.0086],"host_temperature_k":[75,75],"semi_major_axis_km":[32911.531554,32911.531554],"orbital_period_days":[0.000024,0.000024]},"host_mass_solar":0.118,"inclination_deg":89.287,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.1556,"planets_in_system":2,"discovery_facility":"SPECULOOS Southern Observatory","host_spectral_type":"M6 V","host_temperature_k":2850,"orbital_period_days":8.457463,"transit_midpoint_bjd":2459520.70598,"equilibrium_temperature_k":272},"designations":[{"catalog":"Exoplanet","designation":"LP 890-9 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."}