{"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":"2026-09-08T10:55:38.106Z","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":"g-261-6-b","name":"G 261-6 b","class":"terrestrial_planet","category":"exoplanet","object_type":"Terrestrial planet","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":34.659659790825174,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":291.07432,"dec_deg":75.5558405,"epoch_ra_deg":290.872081,"epoch_dec_deg":75.607226,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"G 261-6","semi_major_axis_km":4444552.738496999,"periapsis_km":null,"mass_kg":8.181869978874191e+24,"mass_msun":0.00000411478,"constellation":"Draco","discovered":"2025","featured":false,"url":"https://spacecatalog.org/object/g-261-6-b","radius_km":7015.910000000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"G 261-6","host_v_mag":15.75,"eccentricity":0,"uncertainties":{"mass_kg":[1.3138769309141034e+24,1.3735986095920172e+24],"distance_ly":[0.020547851796154835,0.020547851796154835],"host_mass_solar":[0.011,0.011],"host_radius_solar":[0.004577,0.004577],"host_temperature_k":[157,157],"semi_major_axis_km":[139126.01975099999,130150.14750899999],"orbital_period_days":[0.0032,0.0031]},"host_mass_solar":0.118,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":0.153162,"planets_in_system":1,"discovery_facility":"Calar Alto Observatory","host_spectral_type":"M5.5 V","host_temperature_k":2907,"orbital_period_days":5.4536,"transit_midpoint_bjd":2459345.14,"equilibrium_temperature_k":322.3},"designations":[{"catalog":"Exoplanet","designation":"G 261-6 b"},{"catalog":"Host star","designation":"G 261-6"}],"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."}