{"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":"2026-08-27T17:05:53.606Z","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-9-b","name":"DMPP-9 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":357.2684345871436,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":316.3060007,"dec_deg":-66.9581622,"epoch_ra_deg":316.894667,"epoch_dec_deg":-66.851167,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"DMPP-9","semi_major_axis_km":16410886.415789999,"periapsis_km":null,"mass_kg":8.61783823322296e+25,"mass_msun":0.0000433404,"constellation":"Pavo","discovered":"2026","featured":false,"url":"https://spacecatalog.org/object/dmpp-9-b","radius_km":24810.809,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"DMPP-9","host_v_mag":9.22,"uncertainties":{"mass_kg":[1.4094316167987655e+25,1.5348471420223844e+25],"distance_ly":[1.007823207144737,1.0110847709219046],"host_mass_solar":[0.04,0.04],"host_radius_solar":[0.01,0.01],"host_temperature_k":[134.22,131.29],"semi_major_axis_km":[553512.12159,613351.26987],"orbital_period_days":[0.524,0.584],"argument_of_periastron_deg":[78.67,78.32]},"host_mass_solar":1.1,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":1.26,"planets_in_system":1,"discovery_facility":"Multiple Observatories","host_temperature_k":6092,"orbital_period_days":12.733,"periastron_epoch_bjd":2457586.981,"eccentricity_upper_limit":0.25,"equilibrium_temperature_k":995.58,"argument_of_periastron_deg":152.7},"designations":[{"catalog":"Exoplanet","designation":"DMPP-9 b"},{"catalog":"Host star","designation":"DMPP-9"}],"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."}