{"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":"2026-09-07T02:25:50.602Z","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":"hip-8152-c","name":"HIP 8152 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":331.68146675526503,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":26.2092533,"dec_deg":-18.4013844,"epoch_ra_deg":26.532157,"epoch_dec_deg":-18.266357,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HIP 8152","semi_major_axis_km":20794104.0273,"periapsis_km":null,"mass_kg":6.390219618536775e+25,"mass_msun":0.0000321373,"constellation":"Cetus","discovered":"2023","featured":false,"url":"https://spacecatalog.org/object/hip-8152-c","radius_km":16101.035602748,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HIP 8152","host_v_mag":10.07,"eccentricity":0.2,"uncertainties":{"mass_kg":[1.3138769309141034e+25,1.2541552522361896e+25],"radius_km":[897.967660301,954.3500643010001],"distance_ly":[1.36007209507882,1.3731183501874897],"eccentricity":[0.1,0.1],"host_mass_solar":[0.0322,0.035],"host_radius_solar":[0.0163,0.0175],"host_temperature_k":[73,74],"semi_major_axis_km":[299195.7414,448793.61209999997],"orbital_period_days":[0.00025,0.00025],"argument_of_periastron_deg":[160,160]},"host_mass_solar":0.9373,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.9603,"planets_in_system":2,"discovery_facility":"Transiting Exoplanet Survey Satellite (TESS)","host_temperature_k":5618,"orbital_period_days":19.60562,"transit_midpoint_bjd":2458398.2869,"equilibrium_temperature_k":650.68,"argument_of_periastron_deg":110},"designations":[{"catalog":"Exoplanet","designation":"HIP 8152 c"},{"catalog":"Host star","designation":"HIP 8152"}],"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."}