{"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":"2026-09-07T16:23:03.116Z","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-41004-b-b","name":"HD 41004 B b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":135.51927956681777,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":89.9565956,"dec_deg":-48.2394114,"epoch_ra_deg":90.133332,"epoch_dec_deg":-48.237225,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 41004 B","semi_major_axis_km":null,"periapsis_km":null,"mass_kg":3.486724794084773e+28,"mass_msun":0.0175352,"constellation":"Pictor","discovered":"2003","featured":false,"url":"https://spacecatalog.org/object/hd-41004-b-b","radius_km":77175.01000000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 41004 B","host_v_mag":8.6078,"eccentricity":0.081,"uncertainties":{"mass_kg":[4.175739773159732e+26,4.175739773159732e+26],"distance_ly":[1.4791191729454314,1.5117348107171058],"eccentricity":[0.012,0.012],"host_radius_solar":[0.06932,0.061555],"host_temperature_k":[129.07,117.76],"orbital_period_days":[0.000012,0.000012],"argument_of_periastron_deg":[7.8,7.8]},"host_mass_solar":0.4,"stars_in_system":2,"discovery_method":"Radial Velocity","host_radius_solar":1.04137,"planets_in_system":2,"discovery_facility":"La Silla Observatory","host_spectral_type":"M2 V","host_temperature_k":5036,"orbital_period_days":1.3283,"periastron_epoch_bjd":2452434.88,"argument_of_periastron_deg":178.5},"designations":[{"catalog":"Exoplanet","designation":"HD 41004 B b"},{"catalog":"Host star","designation":"HD 41004 B"}],"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."}