{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.680","julian_year":2026.68,"time":"2026-09-06T06:57:39.938Z","years_from_j2000":26.68,"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-98649-b","name":"HD 98649 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":137.54895070534906,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":170.2147665,"dec_deg":-23.2181063,"epoch_ra_deg":170.547231,"epoch_dec_deg":-23.365174,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 98649","semi_major_axis_km":893099288.0789999,"periapsis_km":null,"mass_kg":1.8411808617640191e+28,"mass_msun":0.00925956,"constellation":"Crater","discovered":"2012","featured":false,"url":"https://spacecatalog.org/object/hd-98649-b","radius_km":79726.25,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 98649","host_v_mag":8,"eccentricity":0.852,"uncertainties":{"mass_kg":[3.606436739537769e+27,4.3656865794404574e+27],"distance_ly":[0.28538683050215047,0.2863652996353007],"eccentricity":[0.022,0.033],"host_mass_solar":[0.02,0.02],"inclination_deg":[8.1,13],"host_radius_solar":[0.02,0.02],"host_temperature_k":[35,35],"semi_major_axis_km":[31415552.846999995,35903488.967999995],"orbital_period_days":[274,321],"argument_of_periastron_deg":[6.3,3.2]},"host_mass_solar":0.97,"inclination_deg":43.7,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":1.01,"planets_in_system":1,"discovery_facility":"La Silla Observatory","host_spectral_type":"G3/G5 V","host_temperature_k":5759,"orbital_period_days":5384,"periastron_epoch_bjd":2460500,"equilibrium_temperature_k":114.22,"argument_of_periastron_deg":250.2},"designations":[{"catalog":"Exoplanet","designation":"HD 98649 b"},{"catalog":"Host star","designation":"HD 98649"}],"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."}