{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.683","julian_year":2026.683,"time":"2026-09-07T15:18:53.302Z","years_from_j2000":26.683,"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-180-b","name":"GJ 180 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":38.94535459402318,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":73.460097,"dec_deg":-17.776194,"epoch_ra_deg":73.75862,"epoch_dec_deg":-17.731775,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"GJ 180","semi_major_axis_km":13763004.104399998,"periapsis_km":null,"mass_kg":3.875936946196605e+25,"mass_msun":0.0000194926,"constellation":"Eridanus","discovered":"2014","featured":false,"url":"https://spacecatalog.org/object/gj-180-b","radius_km":15498.783000000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"GJ 180","host_v_mag":10.914,"eccentricity":0.07,"uncertainties":{"mass_kg":[4.0610741500981384e+24,4.0610741500981384e+24],"distance_ly":[0.014677036997253453,0.014677036997253453],"eccentricity":[0.04,0.04],"host_radius_solar":[0.012311,0.012311],"semi_major_axis_km":[448793.61209999997,448793.61209999997],"orbital_period_days":[0.003,0.003],"argument_of_periastron_deg":[26,26]},"host_mass_solar":0.43,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":0.413049,"planets_in_system":3,"discovery_facility":"Multiple Observatories","host_spectral_type":"M3","host_temperature_k":3371,"orbital_period_days":17.133,"equilibrium_temperature_k":344.43,"argument_of_periastron_deg":276},"designations":[{"catalog":"Exoplanet","designation":"GJ 180 b"}],"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."}