{"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":"2026-09-06T13:50:26.086Z","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":"hd-24040-c","name":"HD 24040 c","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":152.061931044611,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":57.5962104,"dec_deg":17.4752873,"epoch_ra_deg":57.979972,"epoch_dec_deg":17.55695,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 24040","semi_major_axis_km":194477231.91,"periapsis_km":null,"mass_kg":3.815230445690174e+26,"mass_msun":0.000191873,"constellation":"Taurus","discovered":"2021","featured":false,"url":"https://spacecatalog.org/object/hd-24040-c","radius_km":59635.235,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 24040","host_v_mag":7.515,"eccentricity":0.11,"uncertainties":{"mass_kg":[5.124936419940362e+25,5.124936419940362e+25],"distance_ly":[0.44194189180618737,0.4442249864502045],"eccentricity":[0.079,0.12],"host_mass_solar":[0.05295,0.05295],"host_radius_solar":[0.03137,0.03137],"host_temperature_k":[84.58,84.58],"semi_major_axis_km":[3291153.1553999996,3141555.2846999997],"orbital_period_days":[2.5,2.2],"argument_of_periastron_deg":[49.8473,74.4845]},"host_mass_solar":1.10394,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":1.387296,"planets_in_system":2,"discovery_facility":"Multiple Observatories","host_spectral_type":"G0 V","host_temperature_k":5776.49,"orbital_period_days":515.4,"transit_midpoint_bjd":2454984,"equilibrium_temperature_k":287.75,"argument_of_periastron_deg":-17.1887},"designations":[{"catalog":"Exoplanet","designation":"HD 24040 c"}],"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."}