{"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":"2026-09-06T23:29:30.756Z","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":"gj-9827-b","name":"GJ 9827 b","class":"super_earth","category":"exoplanet","object_type":"Super-Earth","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":96.74124319456327,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":351.7717763,"dec_deg":-1.2853435,"epoch_ra_deg":352.116498,"epoch_dec_deg":-1.137573,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"GJ 9827","semi_major_axis_km":2827399.75623,"periapsis_km":null,"mass_kg":2.5560878474147103e+25,"mass_msun":0.0000128549,"constellation":"Pisces","discovered":"2017","featured":false,"url":"https://spacecatalog.org/object/gj-9827-b","radius_km":9184.464,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"GJ 9827","host_v_mag":10.37,"eccentricity":0,"uncertainties":{"mass_kg":[1.9708153963711551e+24,2.0902587537269827e+24],"radius_km":[446.46700000000004,574.029],"distance_ly":[0.1764506003447582,0.1771029131001917],"host_mass_solar":[0.04,0.04],"inclination_deg":[1.27,1.31],"host_radius_solar":[0.03,0.03],"host_temperature_k":[12,12],"semi_major_axis_km":[59839.14828,59839.14828],"orbital_period_days":[0.000001,0.000001]},"host_mass_solar":0.62,"inclination_deg":87.6,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.58,"planets_in_system":3,"discovery_facility":"K2","host_spectral_type":"K7 V","host_temperature_k":4236,"orbital_period_days":1.208974,"periastron_epoch_bjd":2457738.8259,"transit_midpoint_bjd":2457738.8259,"equilibrium_temperature_k":1035.01},"designations":[{"catalog":"Exoplanet","designation":"GJ 9827 b"},{"catalog":"Host star","designation":"GJ 9827"}],"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."}