{"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":"2026-09-09T00:55:12.633Z","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":"gj-1289-b","name":"GJ 1289 b","class":"neptune_like_planet","category":"exoplanet","object_type":"Neptune-like planet","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":27.238852038100514,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":355.7813464,"dec_deg":36.5363314,"epoch_ra_deg":356.116085,"epoch_dec_deg":36.685397,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"GJ 1289","semi_major_axis_km":40391425.089,"periapsis_km":null,"mass_kg":3.7445492531051944e+25,"mass_msun":0.0000188319,"constellation":"Andromeda","discovered":"2024","featured":false,"url":"https://spacecatalog.org/object/gj-1289-b","radius_km":15179.878,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"GJ 1289","host_v_mag":12.48,"eccentricity":0,"uncertainties":{"mass_kg":[7.465209834739224e+24,7.345766477383396e+24],"distance_ly":[0.02667959169722961,0.026712207335001285],"host_mass_solar":[0.02,0.02],"host_radius_solar":[0.00734,0.00734],"host_temperature_k":[30,30],"semi_major_axis_km":[1495978.707,1495978.707],"orbital_period_days":[0.71,0.73]},"host_mass_solar":0.21,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":0.245012,"planets_in_system":1,"discovery_facility":"Multiple Observatories","host_spectral_type":"M4.5 Ve","host_temperature_k":3296,"orbital_period_days":111.74,"transit_midpoint_bjd":2459403.2,"equilibrium_temperature_k":150,"argument_of_periastron_deg":0},"designations":[{"catalog":"Exoplanet","designation":"GJ 1289 b"},{"catalog":"Host star","designation":"GJ 1289"}],"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."}