{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.686","julian_year":2026.686,"time":"2026-09-08T17:07:04.479Z","years_from_j2000":26.686,"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-3-a-b","name":"DMPP-3 A b","class":"super_earth","category":"exoplanet","object_type":"Super-Earth","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":152.94027016980218,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":91.6243532,"dec_deg":-72.5143057,"epoch_ra_deg":91.493721,"epoch_dec_deg":-72.51606,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"DMPP-3 A","semi_major_axis_km":8913041.136305999,"periapsis_km":null,"mass_kg":1.5945688207002981e+25,"mass_msun":0.00000801932,"constellation":"Mensa","discovered":"2019","featured":false,"url":"https://spacecatalog.org/object/dmpp-3-a-b","radius_km":9184.464,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"DMPP-3 A","host_v_mag":9.1,"eccentricity":0.42,"uncertainties":{"mass_kg":[3.344414005963173e+24,2.9860839338956896e+24],"distance_ly":[0.7416796029278745,0.7488550432376428],"eccentricity":[0.17,0.17],"host_mass_solar":[0.009,0.009],"host_radius_solar":[0.02,0.02],"host_temperature_k":[99,99],"semi_major_axis_km":[64327.08440099999,178021.466133],"orbital_period_days":[0.002,0.169],"argument_of_periastron_deg":[30,28]},"host_mass_solar":0.9,"stars_in_system":2,"discovery_method":"Radial Velocity","host_radius_solar":0.91,"planets_in_system":1,"discovery_facility":"La Silla Observatory","host_spectral_type":"K0 V","host_temperature_k":5138,"orbital_period_days":5.59,"periastron_epoch_bjd":2457432.1,"equilibrium_temperature_k":854,"argument_of_periastron_deg":112},"designations":[{"catalog":"Exoplanet","designation":"DMPP-3 A b"},{"catalog":"Host star","designation":"DMPP-3 A"}],"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."}