{"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":"2026-09-05T23:00:29.571Z","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-46375-b","name":"HD 46375 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":96.38866815025146,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":98.3030763,"dec_deg":5.4625071,"epoch_ra_deg":98.661404,"epoch_dec_deg":5.442713,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 46375","semi_major_axis_km":5953995.25386,"periapsis_km":null,"mass_kg":4.28801652907421e+26,"mass_msun":0.000215651,"constellation":"Monoceros","discovered":"2000","featured":false,"url":"https://spacecatalog.org/object/hd-46375-b","radius_km":63781,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 46375","host_v_mag":7.91,"eccentricity":0.063,"uncertainties":{"mass_kg":[3.5833007206748275e+25,3.5833007206748275e+25],"distance_ly":[0.12491789266551273,0.12491789266551273],"eccentricity":[0.026,0.026],"host_radius_solar":[0.019199,0.019199],"semi_major_axis_km":[344075.10260999994,344075.10260999994],"orbital_period_days":[0.000065,0.000065],"argument_of_periastron_deg":[24,24]},"host_mass_solar":0.92,"stars_in_system":2,"discovery_method":"Radial Velocity","host_radius_solar":0.914196,"planets_in_system":1,"discovery_facility":"W. M. Keck Observatory","host_spectral_type":"K1 IV-V","host_temperature_k":5285,"orbital_period_days":3.023573,"periastron_epoch_bjd":2451071.53,"transit_midpoint_bjd":2452571.044,"equilibrium_temperature_k":1221.4,"argument_of_periastron_deg":114},"designations":[{"catalog":"Exoplanet","designation":"HD 46375 b"},{"catalog":"Host star","designation":"HD 46375"}],"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."}