{"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":"2026-09-08T16:20:10.349Z","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":"l-98-59-d","name":"L 98-59 d","class":"super_earth","category":"exoplanet","object_type":"Super-Earth","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":34.635850375251856,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":124.5328604,"dec_deg":-68.3144658,"epoch_ra_deg":124.563337,"epoch_dec_deg":-68.397396,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"L 98-59","semi_major_axis_km":7390134.81258,"periapsis_km":null,"mass_kg":9.794355303177862e+24,"mass_msun":0.00000492572,"constellation":"Volans","discovered":"2019","featured":false,"url":"https://spacecatalog.org/object/l-98-59-d","radius_km":10377.1687,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"L 98-59","host_v_mag":11.685,"eccentricity":0.006,"uncertainties":{"mass_kg":[4.180517507453966e+23,4.180517507453966e+23],"radius_km":[261.50210000000004,261.50210000000004],"distance_ly":[0.01043700408693579,0.01043700408693579],"eccentricity":[0.004,0.007],"host_mass_solar":[0.0067,0.0067],"inclination_deg":[0.05,0.05],"host_radius_solar":[0.0062,0.0062],"host_temperature_k":[60,60],"semi_major_axis_km":[239356.59312,239356.59312],"orbital_period_days":[0.000002,0.000002],"argument_of_periastron_deg":[50,27]},"host_mass_solar":0.2923,"inclination_deg":88.44,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.3155,"planets_in_system":5,"discovery_facility":"Transiting Exoplanet Survey Satellite (TESS)","host_spectral_type":"M3 V","host_temperature_k":3415,"orbital_period_days":7.450729,"transit_midpoint_bjd":2458362.74002,"equilibrium_temperature_k":416,"argument_of_periastron_deg":180},"designations":[{"catalog":"Exoplanet","designation":"L 98-59 d"}],"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."}