{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.681","julian_year":2026.681,"time":"2026-09-06T13:30:37.043Z","years_from_j2000":26.681,"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-c","name":"HD 190360 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":52.20752522474141,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":300.9092476,"dec_deg":29.894541,"epoch_ra_deg":301.178998,"epoch_dec_deg":29.969704,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 190360","semi_major_axis_km":19417803.61686,"periapsis_km":null,"mass_kg":1.5647079813613414e+26,"mass_msun":0.0000786914,"constellation":"Cygnus","discovered":"2005","featured":false,"url":"https://spacecatalog.org/object/hd-190360-c","radius_km":35270.893000000004,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 190360","host_v_mag":5.738,"eccentricity":0.163,"uncertainties":{"mass_kg":[2.3888671471165517e+25,1.6124853243036723e+26],"distance_ly":[0.0518588640569622,0.0518588640569622],"eccentricity":[0.019,0.02],"host_mass_solar":[0.035,0.036],"inclination_deg":[51,46],"host_radius_solar":[0.02,0.02],"host_temperature_k":[100,100],"semi_major_axis_km":[239356.59312,224396.80604999998],"orbital_period_days":[0.00039,0.00039],"argument_of_periastron_deg":[7.7,7.9]},"host_mass_solar":0.996,"inclination_deg":95,"stars_in_system":2,"discovery_method":"Radial Velocity","host_radius_solar":1.14,"planets_in_system":3,"discovery_facility":"W. M. Keck Observatory","host_spectral_type":"G7 IV-V","host_temperature_k":5560,"orbital_period_days":17.11625,"periastron_epoch_bjd":2455210.18,"transit_midpoint_bjd":2455198.61,"equilibrium_temperature_k":794.55,"argument_of_periastron_deg":320.5},"designations":[{"catalog":"Exoplanet","designation":"HD 190360 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."}