{"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":"2026-09-08T02:29:25.741Z","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-105618-c","name":"HD 105618 c","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":228.5824572898693,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":182.4021288,"dec_deg":11.2115695,"epoch_ra_deg":182.745541,"epoch_dec_deg":11.062026,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 105618","semi_major_axis_km":5345281517.9817,"periapsis_km":null,"mass_kg":5.02832187721732e+28,"mass_msun":0.0252882,"constellation":"Virgo","discovered":"2022","featured":false,"url":"https://spacecatalog.org/object/hd-105618-c","radius_km":75899.39,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 105618","host_v_mag":8.63,"eccentricity":0.126,"uncertainties":{"mass_kg":[5.365998243518222e+27,8.237860762944168e+27],"distance_ly":[0.8029970019386223,0.8082155039820902],"eccentricity":[0.08,0.098],"host_mass_solar":[0.129,0.129],"inclination_deg":[3.897,3.441],"host_radius_solar":[0.068869,0.040488],"host_temperature_k":[129.83,81.93],"semi_major_axis_km":[544386651.4772999,1027138980.2261999],"orbital_period_days":[10271.15556,22860.71764],"argument_of_periastron_deg":[13.748,13.421]},"host_mass_solar":1.01,"inclination_deg":31.968,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":1.27399,"planets_in_system":2,"discovery_facility":"Multiple Observatories","host_temperature_k":5671,"orbital_period_days":77114.07158,"periastron_epoch_bjd":2450210.477,"equilibrium_temperature_k":51.64,"argument_of_periastron_deg":255.004},"designations":[{"catalog":"Exoplanet","designation":"HD 105618 c"},{"catalog":"Host star","designation":"HD 105618"}],"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."}