{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.682","julian_year":2026.682,"time":"2026-09-07T06:23:53.366Z","years_from_j2000":26.682,"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-30177-b","name":"HD 30177 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":181.29956721227302,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":70.4770964,"dec_deg":-58.0208085,"epoch_ra_deg":70.59692,"epoch_dec_deg":-57.968803,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 30177","semi_major_axis_km":522096568.743,"periapsis_km":null,"mass_kg":1.5659527947992945e+28,"mass_msun":0.0078754,"constellation":"Dorado","discovered":"2002","featured":false,"url":"https://spacecatalog.org/object/hd-30177-b","radius_km":80364.06,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 30177","host_v_mag":8.41,"eccentricity":0.186,"uncertainties":{"mass_kg":[1.6134059097932125e+27,1.9930308297445566e+27],"distance_ly":[0.4122616614339637,0.41421859970026415],"eccentricity":[0.004,0.002],"host_mass_solar":[0.12,0.12],"inclination_deg":[4.2,1.7],"host_radius_solar":[0.034,0.034],"host_temperature_k":[56,56],"semi_major_axis_km":[20943701.898000002,26927616.725999996],"orbital_period_days":[3,1],"argument_of_periastron_deg":[2.563,2.525]},"host_mass_solar":0.98,"inclination_deg":65.5,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":1.019,"planets_in_system":2,"discovery_facility":"Anglo-Australian Telescope","host_spectral_type":"G8 V","host_temperature_k":5680,"orbital_period_days":2539,"periastron_epoch_bjd":2456502.4,"equilibrium_temperature_k":148,"argument_of_periastron_deg":32.422},"designations":[{"catalog":"Exoplanet","designation":"HD 30177 b"},{"catalog":"Host star","designation":"HD 30177"}],"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."}