{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.678","julian_year":2026.678,"time":"2026-09-05T16:01:32.503Z","years_from_j2000":26.678,"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-1815-b","name":"LHS 1815 b","class":"terrestrial_planet","category":"exoplanet","object_type":"Terrestrial planet","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":97.33289086374144,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":91.0899861,"dec_deg":-55.3115376,"epoch_ra_deg":91.218067,"epoch_dec_deg":-55.312261,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"LHS 1815","semi_major_axis_km":6043753.976279999,"periapsis_km":null,"mass_kg":9.436025231110379e+24,"mass_msun":0.00000474551,"constellation":"Pictor","discovered":"2020","featured":false,"url":"https://spacecatalog.org/object/lhs-1815-b","radius_km":6939.372800000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"LHS 1815","host_v_mag":12.167,"eccentricity":0,"uncertainties":{"mass_kg":[3.5833007206748275e+24,3.8221874353864827e+24],"radius_km":[408.19840000000005,408.19840000000005],"distance_ly":[0.07795137427430168,0.07795137427430168],"host_mass_solar":[0.015,0.015],"inclination_deg":[1.113,1.113],"host_radius_solar":[0.03,0.03],"host_temperature_k":[142,142],"semi_major_axis_km":[1406219.98458,1406219.98458],"orbital_period_days":[0.000084,0.000084]},"host_mass_solar":0.502,"inclination_deg":88.125,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.501,"planets_in_system":1,"discovery_facility":"Transiting Exoplanet Survey Satellite (TESS)","host_spectral_type":"M1","host_temperature_k":3643,"orbital_period_days":3.814334,"transit_midpoint_bjd":2458327.4161,"equilibrium_temperature_k":617,"argument_of_periastron_deg":90},"designations":[{"catalog":"Exoplanet","designation":"LHS 1815 b"},{"catalog":"Host star","designation":"LHS 1815"}],"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."}