{"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":"2026-09-06T20:32:19.366Z","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":"hat-p-5-b","name":"HAT-P-5 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":989.3497099108608,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":274.4055335,"dec_deg":36.6214617,"epoch_ra_deg":274.638786,"epoch_dec_deg":36.630966,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HAT-P-5","semi_major_axis_km":6093121.273611,"periapsis_km":null,"mass_kg":1.8601714311517316e+27,"mass_msun":0.000935507,"constellation":"Lyra","discovered":"2007","featured":false,"url":"https://spacecatalog.org/object/hat-p-5-b","radius_km":86505.46870900001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HAT-P-5","host_v_mag":11.954,"eccentricity":0,"uncertainties":{"mass_kg":[3.7962682268402685e+26,3.7962682268402685e+26],"radius_km":[7149.21229,7149.21229],"distance_ly":[5.841460724906875,5.909953564227391],"host_mass_solar":[0.29,0.29],"inclination_deg":[0.44,0.44],"host_radius_solar":[0.09,0.09],"host_temperature_k":[100,100],"semi_major_axis_km":[139126.01975099999,74798.93535],"orbital_period_days":[0.000025,0.000025]},"host_mass_solar":1.04,"inclination_deg":86.75,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.12,"planets_in_system":1,"discovery_facility":"HATNet","host_spectral_type":"G","host_temperature_k":5960,"orbital_period_days":2.78849,"transit_midpoint_bjd":2455432.4551,"equilibrium_temperature_k":1517},"designations":[{"catalog":"Exoplanet","designation":"HAT-P-5 b"},{"catalog":"Host star","designation":"HAT-P-5"}],"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."}