{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.676","julian_year":2026.676,"time":"2026-09-04T19:06:25.381Z","years_from_j2000":26.676,"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":"hd-33142-d","name":"HD 33142 d","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":395.8723034536973,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":76.8980559,"dec_deg":-13.9863374,"epoch_ra_deg":77.206051,"epoch_dec_deg":-13.950605,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 33142","semi_major_axis_km":67618237.5564,"periapsis_km":null,"mass_kg":3.7962491995134415e+26,"mass_msun":0.000190919,"constellation":"Lepus","discovered":"2022","featured":false,"url":"https://spacecatalog.org/object/hd-33142-d","radius_km":59443.89200000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 33142","host_v_mag":7.96,"eccentricity":0.191,"uncertainties":{"mass_kg":[5.694373799270162e+25,3.7962491995134414e+25],"distance_ly":[1.9063840277543653,1.9063840277543653],"eccentricity":[0.128,0.14],"host_mass_solar":[0.03,0.03],"host_radius_solar":[0.07,0.03],"host_temperature_k":[15.5,23.6],"semi_major_axis_km":[448793.61209999997,448793.61209999997],"orbital_period_days":[0.1,0.1],"argument_of_periastron_deg":[29,40]},"host_mass_solar":1.52,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":4.17,"planets_in_system":3,"discovery_facility":"Multiple Observatories","host_spectral_type":"K0 III","host_temperature_k":5025.4,"orbital_period_days":89.9,"equilibrium_temperature_k":736.04,"argument_of_periastron_deg":231},"designations":[{"catalog":"Exoplanet","designation":"HD 33142 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":"2026-09-02T19:50:56.720Z","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."}