{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.685","julian_year":2026.685,"time":"2026-09-08T01:32:14.192Z","years_from_j2000":26.685,"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-667-c-b","name":"GJ 667 C 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":23.626637539249806,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":259.7510609,"dec_deg":-34.9977651,"epoch_ra_deg":260.198248,"epoch_dec_deg":-35.026079,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"GJ 667 C","semi_major_axis_km":7544370.217271699,"periapsis_km":null,"mass_kg":3.3921913489055034e+25,"mass_msun":0.0000170598,"constellation":"Scorpius","discovered":"2012","featured":false,"url":"https://spacecatalog.org/object/gj-667-c-b","radius_km":14350.725,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"GJ 667 C","host_v_mag":10.602,"eccentricity":0.2,"uncertainties":{"mass_kg":[1.3735986095920172e+24,1.3735986095920172e+24],"distance_ly":[0.015818584319262058,0.01585119995703373],"eccentricity":[0.1,0.1],"host_mass_solar":[0.02,0.02],"host_temperature_k":[50,50],"semi_major_axis_km":[598.3914828,598.3914828],"orbital_period_days":[0.0019,0.0019],"argument_of_periastron_deg":[23.4,23.4]},"host_mass_solar":0.33,"stars_in_system":3,"discovery_method":"Radial Velocity","planets_in_system":5,"discovery_facility":"La Silla Observatory","host_spectral_type":"M1.5 V","host_temperature_k":3350,"orbital_period_days":7.203,"periastron_epoch_bjd":2454272.9711,"argument_of_periastron_deg":-2.7},"designations":[{"catalog":"Exoplanet","designation":"GJ 667 C 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."}