{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.687","julian_year":2026.687,"time":"2026-09-08T18:07:41.253Z","years_from_j2000":26.687,"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-151450-b","name":"HD 151450 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":142.20483299725558,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":252.0080127,"dec_deg":-15.964345,"epoch_ra_deg":252.392925,"epoch_dec_deg":-16.012282,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 151450","semi_major_axis_km":23935659.312,"periapsis_km":null,"mass_kg":2.296730765884797e+26,"mass_msun":0.000115506,"constellation":"Ophiuchus","discovered":"2022","featured":false,"url":"https://spacecatalog.org/object/hd-151450-b","radius_km":44264.014,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 151450","host_v_mag":7.43,"eccentricity":0.496,"uncertainties":{"mass_kg":[4.745311502377886e+25,3.6064367377461185e+25],"distance_ly":[0.42237250914318275,0.42465560378719996],"eccentricity":[0.104,0.117],"host_mass_solar":[0.16,0.16],"host_radius_solar":[0.041575,0.053777],"host_temperature_k":[85.79,129.58],"semi_major_axis_km":[1196782.9656,1047185.0948999999],"orbital_period_days":[0.00539,0.00846],"argument_of_periastron_deg":[21.649,28.218]},"host_mass_solar":1.14,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":1.17184,"planets_in_system":2,"discovery_facility":"Multiple Observatories","host_temperature_k":6091.98,"orbital_period_days":21.89288,"periastron_epoch_bjd":2452772.869,"equilibrium_temperature_k":795,"argument_of_periastron_deg":257.997},"designations":[{"catalog":"Exoplanet","designation":"HD 151450 b"},{"catalog":"Host star","designation":"HD 151450"}],"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."}