{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.680","julian_year":2026.68,"time":"2026-09-06T06:11:12.348Z","years_from_j2000":26.68,"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-12648-b","name":"HD 12648 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":594.2308276896891,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":34.7480718,"dec_deg":85.7365329,"epoch_ra_deg":36.248926,"epoch_dec_deg":85.859625,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 12648","semi_major_axis_km":80782850.178,"periapsis_km":null,"mass_kg":3.720342862303463e+27,"mass_msun":0.00187101,"constellation":"Cepheus","discovered":"2015","featured":false,"url":"https://spacecatalog.org/object/hd-12648-b","radius_km":85466.54000000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 12648","host_v_mag":6.98656,"eccentricity":0.04,"uncertainties":{"mass_kg":[4.175895049524295e+26,4.175895049524295e+26],"distance_ly":[3.0691315143145554,3.10174715208623],"eccentricity":[0.08,0.08],"host_mass_solar":[0.07,0.07],"host_radius_solar":[0.48,0.48],"host_temperature_k":[7,7],"semi_major_axis_km":[2991957.414,2991957.414],"orbital_period_days":[0.5,0.5],"argument_of_periastron_deg":[140.7,140.7]},"host_mass_solar":0.67,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":11.02,"planets_in_system":1,"discovery_facility":"Bohyunsan Optical Astronomical Observatory","host_spectral_type":"G5","host_temperature_k":4835,"orbital_period_days":133.60001,"periastron_epoch_bjd":2452324.7,"equilibrium_temperature_k":1053.23,"argument_of_periastron_deg":99.3},"designations":[{"catalog":"Exoplanet","designation":"HD 12648 b"},{"catalog":"Host star","designation":"HD 12648"}],"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."}