{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.682","julian_year":2026.682,"time":"2026-09-07T02:43:32.050Z","years_from_j2000":26.682,"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-136352-c","name":"HD 136352 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":47.88627937637227,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":230.4401147,"dec_deg":-48.3188174,"epoch_ra_deg":230.912886,"epoch_dec_deg":-48.415378,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 136352","semi_major_axis_km":25745793.54747,"periapsis_km":null,"mass_kg":6.712716683397511e+25,"mass_msun":0.0000337592,"constellation":"Lupus","discovered":"2019","featured":false,"url":"https://spacecatalog.org/object/hd-136352-c","radius_km":18598.5396,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 136352","host_v_mag":5.65,"eccentricity":0,"uncertainties":{"mass_kg":[3.762465756708569e+24,3.8819091140643965e+24],"radius_km":[465.6013,478.3575],"distance_ly":[0.0645789627879152,0.06490511916563195],"host_mass_solar":[0.04,0.04],"inclination_deg":[0.045,0.042],"host_radius_solar":[0.019,0.019],"host_temperature_k":[61,61],"semi_major_axis_km":[747989.3535,747989.3535],"orbital_period_days":[0.00011,0.00011],"argument_of_periastron_deg":[75.76,74.58]},"host_mass_solar":0.87,"inclination_deg":88.571,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":1.058,"planets_in_system":3,"discovery_facility":"La Silla Observatory","host_spectral_type":"G4 V","host_temperature_k":5664,"orbital_period_days":27.59221,"periastron_epoch_bjd":2455490.0572,"transit_midpoint_bjd":2458954.4099,"equilibrium_temperature_k":677,"argument_of_periastron_deg":-110.22},"designations":[{"catalog":"Exoplanet","designation":"HD 136352 c"},{"catalog":"Host star","designation":"HD 136352"}],"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."}