{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.684","julian_year":2026.684,"time":"2026-09-08T00:06:57.405Z","years_from_j2000":26.684,"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":"teegarden-s-star-d","name":"Teegarden's Star d","class":"terrestrial_planet","category":"exoplanet","object_type":"Terrestrial planet","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":12.494333286297463,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":43.2691449,"dec_deg":16.8649024,"epoch_ra_deg":43.644211,"epoch_dec_deg":16.975075,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Teegarden's Star","semi_major_axis_km":11833191.57237,"periapsis_km":null,"mass_kg":4.897177651588931e+24,"mass_msun":0.00000246286,"constellation":"Aries","discovered":"2024","featured":false,"url":"https://spacecatalog.org/object/teegarden-s-star-d","radius_km":6084.7074,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Teegarden's Star","host_v_mag":15.13,"eccentricity":0.07,"uncertainties":{"mass_kg":[1.0152685375245346e+24,1.0152685375245346e+24],"distance_ly":[0.012948408195354713,0.012981023833126389],"eccentricity":[0.05,0.1],"host_mass_solar":[0.01,0.01],"host_radius_solar":[0.012,0.012],"host_temperature_k":[45,45],"semi_major_axis_km":[403914.25088999997,373994.67675],"orbital_period_days":[0.04,0.03],"argument_of_periastron_deg":[93,129]},"host_mass_solar":0.097,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":0.12,"planets_in_system":3,"discovery_facility":"Multiple Observatories","host_spectral_type":"M7.0 V","host_temperature_k":3034,"orbital_period_days":26.13,"equilibrium_temperature_k":159,"argument_of_periastron_deg":345},"designations":[{"catalog":"Exoplanet","designation":"Teegarden's Star 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."}