{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.684","julian_year":2026.684,"time":"2026-09-07T23:25:57.572Z","years_from_j2000":26.684,"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-102272-b","name":"HD 102272 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":1132.0790023634847,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":176.5980316,"dec_deg":14.1240201,"epoch_ra_deg":176.944992,"epoch_dec_deg":13.974799,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 102272","semi_major_axis_km":76294914.057,"periapsis_km":null,"mass_kg":9.376782520295462e+27,"mass_msun":0.00471572,"constellation":"Leo","discovered":"2008","featured":false,"url":"https://spacecatalog.org/object/hd-102272-b","radius_km":82277.49,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 102272","host_v_mag":8.69,"eccentricity":0.05,"uncertainties":{"mass_kg":[1.2148058325888858e+27,1.2148058325888858e+27],"distance_ly":[45.001426215467674,45.001426215467674],"eccentricity":[0.04,0.04],"host_mass_solar":[0.27,0.27],"host_radius_solar":[0.97,0.97],"host_temperature_k":[40,40],"semi_major_axis_km":[4487936.120999999,4487936.120999999],"orbital_period_days":[0.3,0.3],"argument_of_periastron_deg":[58,58]},"host_mass_solar":1.45,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":10.3,"planets_in_system":1,"discovery_facility":"McDonald Observatory","host_spectral_type":"K0","host_temperature_k":4790,"orbital_period_days":127.58,"periastron_epoch_bjd":2452146,"equilibrium_temperature_k":1038.01,"argument_of_periastron_deg":118},"designations":[{"catalog":"Exoplanet","designation":"HD 102272 b"},{"catalog":"Host star","designation":"HD 102272"}],"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."}