{"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":"2026-09-07T18:50:01.205Z","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-c","name":"Teegarden's Star c","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":43.644202,"epoch_dec_deg":16.97507,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Teegarden's Star","semi_major_axis_km":6806703.116849999,"periapsis_km":null,"mass_kg":6.270776261180948e+24,"mass_msun":0.00000315366,"constellation":"Aries","discovered":"2019","featured":false,"url":"https://spacecatalog.org/object/teegarden-s-star-c","radius_km":6505.662,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Teegarden's Star","host_v_mag":15.13,"eccentricity":0.04,"uncertainties":{"mass_kg":[7.763818228128793e+23,8.361035014907932e+23],"distance_ly":[0.012948408195354713,0.012981023833126389],"eccentricity":[0.03,0.07],"host_mass_solar":[0.01,0.01],"host_radius_solar":[0.012,0.012],"host_temperature_k":[45,45],"semi_major_axis_km":[239356.59312,224396.80604999998],"orbital_period_days":[0.003,0.003],"argument_of_periastron_deg":[74,165]},"host_mass_solar":0.097,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":0.12,"planets_in_system":3,"discovery_facility":"Calar Alto Observatory","host_spectral_type":"M7.0 V","host_temperature_k":3034,"orbital_period_days":11.416,"periastron_epoch_bjd":2458053.2,"equilibrium_temperature_k":209,"argument_of_periastron_deg":301},"designations":[{"catalog":"Exoplanet","designation":"Teegarden's Star 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."}