{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.687","julian_year":2026.687,"time":"2026-09-09T02:16:33.479Z","years_from_j2000":26.687,"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":"lhs-1678-b","name":"LHS 1678 b","class":"terrestrial_planet","category":"exoplanet","object_type":"Terrestrial planet","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":64.8340170752897,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":68.1789866,"dec_deg":-39.7908744,"epoch_ra_deg":68.408362,"epoch_dec_deg":-39.733386,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"LHS 1678","semi_major_axis_km":1853517.6179729998,"periapsis_km":null,"mass_kg":2.0902587537269827e+24,"mass_msun":0.00000105122,"constellation":"Caelum","discovered":"2021","featured":false,"url":"https://spacecatalog.org/object/lhs-1678-b","radius_km":4368.998500000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"LHS 1678","host_v_mag":12.6,"eccentricity":0.033,"uncertainties":{"radius_km":[223.23350000000002,235.9897],"distance_ly":[0.030658699505373883,0.030658699505373883],"eccentricity":[0.023,0.035],"host_mass_solar":[0.014,0.014],"inclination_deg":[1.14,1.02],"host_radius_solar":[0.01,0.01],"host_temperature_k":[50,50],"semi_major_axis_km":[85270.78629899998,83774.80759199998],"orbital_period_days":[0.0000011,0.0000013],"argument_of_periastron_deg":[103,140]},"host_mass_solar":0.345,"inclination_deg":88.53,"stars_in_system":2,"discovery_method":"Transit","host_radius_solar":0.329,"planets_in_system":3,"discovery_facility":"Transiting Exoplanet Survey Satellite (TESS)","host_spectral_type":"M2.0 V","host_temperature_k":3490,"orbital_period_days":0.8602325,"transit_midpoint_bjd":2458998.15553,"equilibrium_temperature_k":830.44,"argument_of_periastron_deg":-23},"designations":[{"catalog":"Exoplanet","designation":"LHS 1678 b"}],"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."}