{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.684","julian_year":2026.684,"time":"2026-09-07T16:06:55.748Z","years_from_j2000":26.684,"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-190360-d","name":"HD 190360 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":52.20752522474141,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":300.9092476,"dec_deg":29.894541,"epoch_ra_deg":301.179037,"epoch_dec_deg":29.969707,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 190360","semi_major_axis_km":58133732.554019995,"periapsis_km":null,"mass_kg":7.1068797626717415e+25,"mass_msun":0.0000357415,"constellation":"Cygnus","discovered":"2026","featured":false,"url":"https://spacecatalog.org/object/hd-190360-d","radius_km":22195.788,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 190360","host_v_mag":5.738,"eccentricity":0.058,"uncertainties":{"mass_kg":[1.0152685375245345e+25,3.702744078030655e+25],"distance_ly":[0.0518588640569622,0.0518588640569622],"eccentricity":[0.04,0.062],"host_mass_solar":[0.035,0.036],"inclination_deg":[41,43],"host_radius_solar":[0.02,0.02],"host_temperature_k":[100,100],"semi_major_axis_km":[688150.2052199999,688150.2052199999],"orbital_period_days":[0.049,0.051],"argument_of_periastron_deg":[100,115]},"host_mass_solar":0.996,"inclination_deg":88,"stars_in_system":2,"discovery_method":"Radial Velocity","host_radius_solar":1.14,"planets_in_system":3,"discovery_facility":"Multiple Facilities","host_spectral_type":"G7 IV-V","host_temperature_k":5560,"orbital_period_days":88.69,"periastron_epoch_bjd":2455234,"equilibrium_temperature_k":459.21,"argument_of_periastron_deg":160},"designations":[{"catalog":"Exoplanet","designation":"HD 190360 d"},{"catalog":"Host star","designation":"HD 190360"}],"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."}