{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.680","julian_year":2026.68,"time":"2026-09-06T06:05:34.716Z","years_from_j2000":26.68,"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-b","name":"HD 27894 b","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":65.313928,"epoch_dec_deg":-59.344999,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 27894","semi_major_axis_km":18699733.8375,"periapsis_km":null,"mass_kg":1.1749391272314936e+27,"mass_msun":0.000590894,"constellation":"Reticulum","discovered":"2005","featured":false,"url":"https://spacecatalog.org/object/hd-27894-b","radius_km":89931.21,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 27894","host_v_mag":9.36,"eccentricity":0.047,"uncertainties":{"mass_kg":[9.490622998783604e+25,9.490622998783604e+25],"distance_ly":[0.19275841923059536,0.19341073198602884],"eccentricity":[0.011,0.012],"host_mass_solar":[0.096,0.096],"inclination_deg":[39,37],"host_radius_solar":[0.023922,0.014934],"host_temperature_k":[81,81],"semi_major_axis_km":[747989.3535,747989.3535],"orbital_period_days":[0.00027,0.00024],"argument_of_periastron_deg":[15.134,10.739]},"host_mass_solar":0.81,"inclination_deg":89,"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":18.01939,"periastron_epoch_bjd":2452934.108,"equilibrium_temperature_k":627.88,"argument_of_periastron_deg":156.983},"designations":[{"catalog":"Exoplanet","designation":"HD 27894 b"},{"catalog":"Host star","designation":"HD 27894"}],"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."}