{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.685","julian_year":2026.685,"time":"2026-09-08T04:00:20.919Z","years_from_j2000":26.685,"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-135344-a-b","name":"HD 135344 A b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":461.82112302802284,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":228.9538416,"dec_deg":-37.1489176,"epoch_ra_deg":229.382887,"epoch_dec_deg":-37.248473,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 135344 A","semi_major_axis_km":2468364866.5499997,"periapsis_km":null,"mass_kg":1.8981245997567208e+28,"mass_msun":0.00954594,"constellation":"Lupus","discovered":"2025","featured":false,"url":"https://spacecatalog.org/object/hd-135344-a-b","radius_km":103663.399681981,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 135344 A","host_v_mag":7.765,"eccentricity":0.5,"uncertainties":{"mass_kg":[3.606436739537769e+27,2.657374439659409e+27],"radius_km":[2144.759987702,4289.519975404],"distance_ly":[5.847983852461209,5.998015786210911],"eccentricity":[0.2,0.2],"host_mass_solar":[0.340902,0.319645],"inclination_deg":[4.7,2.8],"host_radius_solar":[0.01,0.01],"host_temperature_k":[100,100],"semi_major_axis_km":[299195741.4,418874037.9599999],"argument_of_periastron_deg":[10.8,8.7]},"host_mass_solar":2.32,"inclination_deg":73.6,"stars_in_system":2,"discovery_method":"Imaging","host_radius_solar":1.5,"planets_in_system":1,"discovery_facility":"Paranal Observatory","host_spectral_type":"A0 V","host_temperature_k":9540,"periastron_epoch_bjd":2465405.5,"equilibrium_temperature_k":1585,"argument_of_periastron_deg":8.2},"designations":[{"catalog":"Exoplanet","designation":"HD 135344 A b"},{"catalog":"Host star","designation":"HD 135344 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."}