{"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":"2026-09-06T13:28:53.978Z","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":"bd-11-4672-c","name":"BD-11 4672 c","class":"neptune_like_planet","category":"exoplanet","object_type":"Neptune-like planet","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":88.60527235241909,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":278.3688659,"dec_deg":-11.6370481,"epoch_ra_deg":278.743577,"epoch_dec_deg":-11.617064,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"BD-11 4672","semi_major_axis_km":44879361.20999999,"periapsis_km":null,"mass_kg":9.17922201279535e+25,"mass_msun":0.0000461636,"constellation":"Scutum","discovered":"2020","featured":false,"url":"https://spacecatalog.org/object/bd-11-4672-c","radius_km":25767.524,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"BD-11 4672","host_v_mag":10.03,"eccentricity":0.4,"uncertainties":{"mass_kg":[1.6781791708493777e+25,1.7737338567340397e+25],"distance_ly":[0.11285010668999322,0.11285010668999322],"eccentricity":[0.15,0.13],"host_mass_solar":[0.029,0.031],"host_radius_solar":[0.022,0.02],"host_temperature_k":[110,110],"semi_major_axis_km":[1495978.707,1495978.707],"orbital_period_days":[0.08,0.06],"argument_of_periastron_deg":[26.58,23.02]},"host_mass_solar":0.651,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":0.639,"planets_in_system":2,"discovery_facility":"Roque de los Muchachos Observatory","host_spectral_type":"K7V","host_temperature_k":4550,"orbital_period_days":74.2,"equilibrium_temperature_k":320.21,"argument_of_periastron_deg":245.92},"designations":[{"catalog":"Exoplanet","designation":"BD-11 4672 c"},{"catalog":"Host star","designation":"BD-11 4672"}],"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."}