{"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":"2026-09-08T08:52:09.006Z","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-35843-c","name":"HD 35843 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":227.01331895667403,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":81.3488924,"dec_deg":-44.4312849,"epoch_ra_deg":81.548558,"epoch_dec_deg":-44.406755,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 35843","semi_major_axis_km":37399467.675,"periapsis_km":null,"mass_kg":6.760494026339842e+25,"mass_msun":0.0000339995,"constellation":"Pictor","discovered":"2025","featured":false,"url":"https://spacecatalog.org/object/hd-35843-c","radius_km":16200.374000000002,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 35843","host_v_mag":9.36,"eccentricity":0.153,"uncertainties":{"mass_kg":[8.838808444331241e+24,9.436025231110379e+24],"radius_km":[446.46700000000004,510.24800000000005],"distance_ly":[0.41421859970026415,0.41552322521113116],"eccentricity":[0.064,0.07],"host_mass_solar":[0.06,0.06],"inclination_deg":[0.09,0.17],"host_radius_solar":[0.019,0.019],"host_temperature_k":[61,61],"semi_major_axis_km":[1495978.707,1495978.707],"orbital_period_days":[0.0002,0.0002],"argument_of_periastron_deg":[32,37]},"host_mass_solar":0.94,"inclination_deg":89.58,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.897,"planets_in_system":2,"discovery_facility":"Transiting Exoplanet Survey Satellite (TESS)","host_temperature_k":5666,"orbital_period_days":46.9622,"transit_midpoint_bjd":2459221.7562,"equilibrium_temperature_k":479,"argument_of_periastron_deg":211},"designations":[{"catalog":"Exoplanet","designation":"HD 35843 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."}