{"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":"2026-09-08T03:17:04.049Z","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-103720-b","name":"HD 103720 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":148.51595890607456,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":179.1713308,"dec_deg":-2.7791393,"epoch_ra_deg":179.515412,"epoch_dec_deg":-2.928694,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 103720","semi_major_axis_km":7449973.960859999,"periapsis_km":null,"mass_kg":1.1767917896768201e+27,"mass_msun":0.000591826,"constellation":"Virgo","discovered":"2014","featured":false,"url":"https://spacecatalog.org/object/hd-103720-b","radius_km":89931.21,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 103720","host_v_mag":9.5,"eccentricity":0.086,"uncertainties":{"mass_kg":[4.744887370960251e+25,4.744887370960251e+25],"distance_ly":[0.33463644353737876,0.3365933818036792],"eccentricity":[0.024,0.024],"host_mass_solar":[0.04,0.04],"host_radius_solar":[0.02,0.02],"host_temperature_k":[88,88],"semi_major_axis_km":[119678.29656,119678.29656],"orbital_period_days":[0.0001,0.0001],"argument_of_periastron_deg":[15,15]},"host_mass_solar":0.794,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":0.73,"planets_in_system":1,"discovery_facility":"La Silla Observatory","host_spectral_type":"K3 V","host_temperature_k":5017,"orbital_period_days":4.5557,"periastron_epoch_bjd":2455387.46,"equilibrium_temperature_k":926.24,"argument_of_periastron_deg":262},"designations":[{"catalog":"Exoplanet","designation":"HD 103720 b"},{"catalog":"Host star","designation":"HD 103720"}],"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."}