{"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":"2026-09-08T04:49:30.635Z","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-152843-c","name":"HD 152843 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":351.9162084288118,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":253.7848853,"dec_deg":20.491524,"epoch_ra_deg":254.07575,"epoch_dec_deg":20.447897,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 152843","semi_major_axis_km":22170404.437739998,"periapsis_km":null,"mass_kg":5.775086328154264e+25,"mass_msun":0.0000290437,"constellation":"Hercules","discovered":"2021","featured":false,"url":"https://spacecatalog.org/object/hd-152843-c","radius_km":37885.914000000004,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 152843","host_v_mag":8.855,"eccentricity":0.074,"uncertainties":{"mass_kg":[1.1466562306159448e+25,1.1765170699549016e+25],"radius_km":[1020.4960000000001,1148.058],"distance_ly":[1.0306541535849092,1.0371772811392441],"eccentricity":[0.05,0.072],"host_mass_solar":[0.04,0.04],"inclination_deg":[0.4,0.53],"host_radius_solar":[0.02,0.02],"host_temperature_k":[100,100],"semi_major_axis_km":[628311.0569399999,613351.26987],"orbital_period_days":[0.000085,0.000074]},"host_mass_solar":1.15,"inclination_deg":89.21,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.43,"planets_in_system":2,"discovery_facility":"Transiting Exoplanet Survey Satellite (TESS)","host_spectral_type":"G0","host_temperature_k":6310,"orbital_period_days":19.502104,"transit_midpoint_bjd":2459002.7715,"equilibrium_temperature_k":253.08},"designations":[{"catalog":"Exoplanet","designation":"HD 152843 c"},{"catalog":"Host star","designation":"HD 152843"}],"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."}