{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.670","julian_year":2026.67,"time":"2026-09-02T13:01:40.622Z","years_from_j2000":26.67,"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":"dmpp-6-c","name":"DMPP-6 c","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":178.18020761579007,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":120.3857827,"dec_deg":-70.0234291,"epoch_ra_deg":120.371127,"epoch_dec_deg":-70.097031,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"DMPP-6","semi_major_axis_km":33001290.276419997,"periapsis_km":null,"mass_kg":8.044510117914987e+25,"mass_msun":0.000040457,"constellation":"Volans","discovered":"2026","featured":false,"url":"https://spacecatalog.org/object/dmpp-6-c","radius_km":23854.094,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"DMPP-6","host_v_mag":7.71,"uncertainties":{"mass_kg":[1.1765170699549016e+25,9.555468588466207e+24],"distance_ly":[0.26483897870599565,0.2658174478391459],"host_mass_solar":[0.045,0.045],"host_radius_solar":[0.01,0.01],"host_temperature_k":[99.94,133.83],"semi_major_axis_km":[583431.6957299999,493672.97331],"orbital_period_days":[0.07,0.077],"argument_of_periastron_deg":[28,38]},"host_mass_solar":1.079,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":1.27,"planets_in_system":2,"discovery_facility":"Multiple Observatories","host_temperature_k":6182.09,"orbital_period_days":36.441,"periastron_epoch_bjd":2458842.5,"eccentricity_upper_limit":0.31,"equilibrium_temperature_k":715.27,"argument_of_periastron_deg":178},"designations":[{"catalog":"Exoplanet","designation":"DMPP-6 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":"2026-09-01T22:58:55.274Z","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."}