{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.668","julian_year":2026.668,"time":"2026-09-01T23:42:10.931Z","years_from_j2000":26.668,"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-1-d","name":"DMPP-1 d","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":203.97428474751874,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":86.7761233,"dec_deg":-10.6303217,"epoch_ra_deg":87.092142,"epoch_dec_deg":-10.62002,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"DMPP-1","semi_major_axis_km":6682536.884168999,"periapsis_km":null,"mass_kg":2.818863233597531e+25,"mass_msun":0.0000141765,"constellation":"Orion","discovered":"2019","featured":false,"url":"https://spacecatalog.org/object/dmpp-1-d","radius_km":12883.762,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"DMPP-1","host_v_mag":7.98,"uncertainties":{"mass_kg":[4.359682543487707e+24,4.837455972911017e+24],"distance_ly":[0.5782752576917861,0.5812106650912368],"host_mass_solar":[0.03,0.03],"host_radius_solar":[0.02,0.02],"host_temperature_k":[29,29],"semi_major_axis_km":[59839.14828,67319.04181499999],"orbital_period_days":[0.0248,0.002],"argument_of_periastron_deg":[37,34]},"host_mass_solar":1.21,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":1.26,"planets_in_system":4,"discovery_facility":"La Silla Observatory","host_spectral_type":"F8 V","host_temperature_k":6196,"orbital_period_days":3.1417,"periastron_epoch_bjd":2458688.54,"eccentricity_upper_limit":0.36,"equilibrium_temperature_k":1632,"argument_of_periastron_deg":233},"designations":[{"catalog":"Exoplanet","designation":"DMPP-1 d"},{"catalog":"Host star","designation":"DMPP-1"}],"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."}