{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.683","julian_year":2026.683,"time":"2026-09-07T08:37:06.695Z","years_from_j2000":26.683,"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-27894-d","name":"HD 27894 d","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":142.92629090476498,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":65.1975693,"dec_deg":-59.4096776,"epoch_ra_deg":65.313953,"epoch_dec_deg":-59.344981,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 27894","semi_major_axis_km":802143782.6933999,"periapsis_km":null,"mass_kg":1.2324523026214415e+28,"mass_msun":0.00619818,"constellation":"Reticulum","discovered":"2017","featured":false,"url":"https://spacecatalog.org/object/hd-27894-d","radius_km":81001.87,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 27894","host_v_mag":9.36,"eccentricity":0.343,"uncertainties":{"mass_kg":[6.700379837081502e+26,1.8734489799658554e+27],"distance_ly":[0.19275841923059536,0.19341073198602884],"eccentricity":[0.026,0.031],"host_mass_solar":[0.096,0.096],"inclination_deg":[31.503,14.742],"host_radius_solar":[0.023922,0.014934],"host_temperature_k":[81,81],"semi_major_axis_km":[33360325.1661,30817161.364199996],"orbital_period_days":[31.12557,32.59359],"argument_of_periastron_deg":[3.713,4.024]},"host_mass_solar":0.81,"inclination_deg":101.524,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":0.891767,"planets_in_system":3,"discovery_facility":"La Silla Observatory","host_spectral_type":"K2 V","host_temperature_k":4875,"orbital_period_days":5019.54244,"periastron_epoch_bjd":2447991.499,"equilibrium_temperature_k":95.87,"argument_of_periastron_deg":334.378},"designations":[{"catalog":"Exoplanet","designation":"HD 27894 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."}