{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.687","julian_year":2026.687,"time":"2026-09-08T18:07:12.636Z","years_from_j2000":26.687,"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":"hip-74890-b","name":"HIP 74890 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":256.5422127696371,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":229.5714974,"dec_deg":-41.4210961,"epoch_ra_deg":230.015455,"epoch_dec_deg":-41.519439,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HIP 74890","semi_major_axis_km":314155528.46999997,"periapsis_km":null,"mass_kg":4.555521872208322e+27,"mass_msun":0.00229104,"constellation":"Lupus","discovered":"2016","featured":false,"url":"https://spacecatalog.org/object/hip-74890-b","radius_km":84828.73000000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HIP 74890","host_v_mag":7.05,"eccentricity":0.07,"uncertainties":{"mass_kg":[5.6944023402604025e+26,5.6944023402604025e+26],"distance_ly":[0.8349603269548632,0.8349603269548632],"eccentricity":[0.07,0.07],"host_mass_solar":[0.21,0.21],"host_radius_solar":[0.53,0.53],"host_temperature_k":[100,100],"semi_major_axis_km":[13463808.362999998,13463808.362999998],"orbital_period_days":[16.8,16.8],"argument_of_periastron_deg":[93.9,93.9]},"host_mass_solar":1.74,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":5.77,"planets_in_system":1,"discovery_facility":"Multiple Observatories","host_spectral_type":"K1 III","host_temperature_k":4850,"orbital_period_days":822.3,"periastron_epoch_bjd":2459820.4,"equilibrium_temperature_k":387.66,"argument_of_periastron_deg":181.9},"designations":[{"catalog":"Exoplanet","designation":"HIP 74890 b"},{"catalog":"Host star","designation":"HIP 74890"}],"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."}