{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.685","julian_year":2026.685,"time":"2026-09-08T07:42:46.652Z","years_from_j2000":26.685,"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-11964-c","name":"HD 11964 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":109.38273823848654,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":29.2884252,"dec_deg":-10.2434693,"epoch_ra_deg":29.619869,"epoch_dec_deg":-10.112074,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 11964","semi_major_axis_km":34257912.3903,"periapsis_km":null,"mass_kg":1.4930419669478448e+26,"mass_msun":0.0000750872,"constellation":"Cetus","discovered":"2008","featured":false,"url":"https://spacecatalog.org/object/hd-11964-c","radius_km":34314.178,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 11964","host_v_mag":6.41525,"eccentricity":0.3,"uncertainties":{"mass_kg":[1.8513720390153276e+25,1.8513720390153276e+25],"distance_ly":[0.13959492966276618,0.13959492966276618],"eccentricity":[0.17,0.17],"host_mass_solar":[0.105744,0.123927],"host_radius_solar":[0.088864,0.104251],"host_temperature_k":[94.09,116.97],"semi_major_axis_km":[1944772.3190999997,1944772.3190999997],"orbital_period_days":[0.041,0.041]},"host_mass_solar":0.91,"stars_in_system":2,"discovery_method":"Radial Velocity","host_radius_solar":2.00971,"planets_in_system":2,"discovery_facility":"W. M. Keck Observatory","host_spectral_type":"G9 V CN+1","host_temperature_k":5303,"orbital_period_days":37.91,"periastron_epoch_bjd":2454370,"transit_midpoint_bjd":2455199.94,"equilibrium_temperature_k":757.54,"argument_of_periastron_deg":102},"designations":[{"catalog":"Exoplanet","designation":"HD 11964 c"}],"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."}