{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.683","julian_year":2026.683,"time":"2026-09-07T12:49:38.576Z","years_from_j2000":26.683,"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-89345-b","name":"HD 89345 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":431.6516580892241,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":154.6710977,"dec_deg":10.1288464,"epoch_ra_deg":155.027004,"epoch_dec_deg":9.994426,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 89345","semi_major_axis_km":15947133.016619999,"periapsis_km":null,"mass_kg":2.0879475247621476e+26,"mass_msun":0.000105006,"constellation":"Leo","discovered":"2018","featured":false,"url":"https://spacecatalog.org/object/hd-89345-b","radius_km":47184.801114,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 89345","host_v_mag":9.38,"eccentricity":0.22,"uncertainties":{"mass_kg":[3.416641404156241e+25,3.226827992814228e+25],"radius_km":[2144.763687,2001.7794412000003],"distance_ly":[2.60598945795678,2.635343531951287],"eccentricity":[0.13,0.095],"host_mass_solar":[0.045,0.04],"inclination_deg":[0.22,0.43],"host_radius_solar":[0.05,0.049],"host_temperature_k":[76,73],"semi_major_axis_km":[209437.01898,179517.44483999998],"orbital_period_days":[0.0002,0.0002],"argument_of_periastron_deg":[27,58]},"host_mass_solar":1.157,"inclination_deg":87.21,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.747,"planets_in_system":1,"discovery_facility":"K2","host_spectral_type":"G5","host_temperature_k":5576,"orbital_period_days":11.8143,"periastron_epoch_bjd":2457911.3,"transit_midpoint_bjd":2457913.8052,"equilibrium_temperature_k":1089,"argument_of_periastron_deg":-13},"designations":[{"catalog":"Exoplanet","designation":"HD 89345 b"},{"catalog":"Host star","designation":"HD 89345"}],"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."}