{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.654","julian_year":2026.654,"time":"2026-08-27T17:05:59.623Z","years_from_j2000":26.654,"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-2-d","name":"DMPP-2 d","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":449.90010742247586,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":27.407731,"dec_deg":-34.4590985,"epoch_ra_deg":27.705752,"epoch_dec_deg":-34.325539,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"DMPP-2","semi_major_axis_km":21422415.084239997,"periapsis_km":null,"mass_kg":5.481852885845707e+26,"mass_msun":0.00027569,"constellation":"Fornax","discovered":"2026","featured":false,"url":"https://spacecatalog.org/object/dmpp-2-d","radius_km":73985.96,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"DMPP-2","host_v_mag":8.57,"uncertainties":{"mass_kg":[4.37162687922329e+25,3.648994567220533e+25],"distance_ly":[2.201555549588018,2.2211249322510227],"host_mass_solar":[0.04,0.04],"host_radius_solar":[0.09,0.09],"host_temperature_k":[100,100],"semi_major_axis_km":[194477.23190999997,179517.44483999998],"orbital_period_days":[0.053,0.067],"argument_of_periastron_deg":[207,57.9]},"host_mass_solar":1.41,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":1.78,"planets_in_system":3,"discovery_facility":"Multiple Observatories","host_spectral_type":"F5 V","host_temperature_k":6500,"orbital_period_days":16.491,"periastron_epoch_bjd":2457516.66,"eccentricity_upper_limit":0.1,"equilibrium_temperature_k":1105.06,"argument_of_periastron_deg":267},"designations":[{"catalog":"Exoplanet","designation":"DMPP-2 d"}],"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":"2026-08-27T16:03:54.983Z","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."}