{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.678","julian_year":2026.678,"time":"2026-09-05T14:18:07.514Z","years_from_j2000":26.678,"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-96700-d","name":"HD 96700 d","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":82.87992329797939,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":166.9742616,"dec_deg":-30.1751383,"epoch_ra_deg":167.297704,"epoch_dec_deg":-30.320413,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 96700","semi_major_axis_km":63429497.17679999,"periapsis_km":null,"mass_kg":7.584653192095051e+25,"mass_msun":0.0000381443,"constellation":"Hydra","discovered":"2021","featured":false,"url":"https://spacecatalog.org/object/hd-96700-d","radius_km":23024.941,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 96700","host_v_mag":6.51,"eccentricity":0.27,"uncertainties":{"mass_kg":[5.972167867791379e+24,5.972167867791379e+24],"distance_ly":[0.09230225489383838,0.09262841127155513],"eccentricity":[0.08,0.08],"host_mass_solar":[0.01,0.01],"host_radius_solar":[0.04,0.04],"host_temperature_k":[13,13],"semi_major_axis_km":[1047185.0948999999,1047185.0948999999],"orbital_period_days":[0.1,0.1],"argument_of_periastron_deg":[18,18]},"host_mass_solar":0.89,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":1.16,"planets_in_system":3,"discovery_facility":"La Silla Observatory","host_spectral_type":"G0 V","host_temperature_k":5845,"orbital_period_days":103.5,"periastron_epoch_bjd":2455500,"equilibrium_temperature_k":466.19,"argument_of_periastron_deg":42},"designations":[{"catalog":"Exoplanet","designation":"HD 96700 d"}],"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."}