{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.679","julian_year":2026.679,"time":"2026-09-06T04:28:44.746Z","years_from_j2000":26.679,"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-55696-b","name":"HD 55696 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":254.30184461110085,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":108.0622029,"dec_deg":-38.174639,"epoch_ra_deg":108.294031,"epoch_dec_deg":-38.219119,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 55696","semi_major_axis_km":475721228.826,"periapsis_km":null,"mass_kg":8.104992040961197e+27,"mass_msun":0.00407612,"constellation":"Puppis","discovered":"2018","featured":false,"url":"https://spacecatalog.org/object/hd-55696-b","radius_km":82277.49,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 55696","host_v_mag":7.95,"eccentricity":0.705,"uncertainties":{"mass_kg":[1.3097059738321373e+27,1.8981245997567207e+27],"distance_ly":[0.5958877020884902,0.5988231094879409],"eccentricity":[0.022,0.022],"host_mass_solar":[0.2,0.2],"inclination_deg":[13,19],"host_radius_solar":[0.07,0.07],"semi_major_axis_km":[26927616.725999996,26927616.725999996],"orbital_period_days":[10,10],"argument_of_periastron_deg":[2.4,2.4]},"host_mass_solar":1.29,"inclination_deg":57,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":1.52,"planets_in_system":1,"discovery_facility":"W. M. Keck Observatory","host_spectral_type":"G0 V","host_temperature_k":6012,"orbital_period_days":1827,"periastron_epoch_bjd":2463648,"equilibrium_temperature_k":200.43,"argument_of_periastron_deg":137},"designations":[{"catalog":"Exoplanet","designation":"HD 55696 b"},{"catalog":"Host star","designation":"HD 55696"}],"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."}