{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.681","julian_year":2026.681,"time":"2026-09-06T16:18:04.127Z","years_from_j2000":26.681,"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-108874-c","name":"HD 108874 c","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":194.12012210756276,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":187.6126029,"dec_deg":22.8794399,"epoch_ra_deg":187.94926,"epoch_dec_deg":22.730944,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 108874","semi_major_axis_km":397780738.1912999,"periapsis_km":null,"mass_kg":1.8790828979218794e+27,"mass_msun":0.000945018,"constellation":"Coma Berenices","discovered":"2005","featured":false,"url":"https://spacecatalog.org/object/hd-108874-c","radius_km":88017.78000000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 108874","host_v_mag":8.76,"eccentricity":0.239,"uncertainties":{"mass_kg":[1.138892412387816e+26,1.138892412387816e+26],"distance_ly":[0.5140224512815876,0.5169578586810383],"eccentricity":[0.031,0.031],"host_mass_solar":[0.036,0.036],"host_radius_solar":[0.02,0.02],"host_temperature_k":[44,44],"semi_major_axis_km":[8975872.241999999,8975872.241999999],"orbital_period_days":[23,23],"argument_of_periastron_deg":[10,10]},"host_mass_solar":0.95,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":1.05,"planets_in_system":2,"discovery_facility":"W. M. Keck Observatory","host_spectral_type":"G5","host_temperature_k":5551,"orbital_period_days":1624,"periastron_epoch_bjd":2452839,"transit_midpoint_bjd":2454785,"equilibrium_temperature_k":168.21,"argument_of_periastron_deg":27},"designations":[{"catalog":"Exoplanet","designation":"HD 108874 c"},{"catalog":"Host star","designation":"HD 108874"}],"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."}