{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.676","julian_year":2026.676,"time":"2026-09-05T00:02:15.956Z","years_from_j2000":26.676,"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-142-a-d","name":"HD 142 A d","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":85.40502597426241,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":1.5836771,"dec_deg":-49.0753625,"epoch_ra_deg":1.925167,"epoch_dec_deg":-48.92584,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 142","semi_major_axis_km":70909390.7118,"periapsis_km":null,"mass_kg":4.9351239593674735e+26,"mass_msun":0.000248195,"constellation":"Phoenix","discovered":"2022","featured":false,"url":"https://spacecatalog.org/object/hd-142-a-d","radius_km":69521.29000000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 142","host_v_mag":5.7,"eccentricity":0.13,"uncertainties":{"mass_kg":[6.833248557929761e+25,6.073998716832639e+25],"distance_ly":[0.14546574446166757,0.1464442135948178],"eccentricity":[0.085,0.103],"host_mass_solar":[0.17,0.17],"host_radius_solar":[0.04,0.04],"host_temperature_k":[48,48],"semi_major_axis_km":[3440751.0260999994,3141555.2846999997],"orbital_period_days":[0.08819,0.09021],"argument_of_periastron_deg":[56.789,43.508]},"host_mass_solar":1.21,"stars_in_system":2,"discovery_method":"Radial Velocity","host_radius_solar":1.47,"planets_in_system":3,"discovery_facility":"Multiple Observatories","host_spectral_type":"F7V","host_temperature_k":6245,"orbital_period_days":108.45299,"periastron_epoch_bjd":2450799.614,"equilibrium_temperature_k":530.32,"argument_of_periastron_deg":89.593},"designations":[{"catalog":"Exoplanet","designation":"HD 142 A d"}],"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."}