{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.686","julian_year":2026.686,"time":"2026-09-08T11:56:41.999Z","years_from_j2000":26.686,"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-68988-b","name":"HD 68988 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":198.44886955261939,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":124.5935429,"dec_deg":61.4608518,"epoch_ra_deg":125.165533,"epoch_dec_deg":61.377202,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 68988","semi_major_axis_km":10471850.949000001,"periapsis_km":null,"mass_kg":3.739324203437664e+27,"mass_msun":0.00188056,"constellation":"Ursa Major","discovered":"2001","featured":false,"url":"https://spacecatalog.org/object/hd-68988-b","radius_km":85466.54000000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 68988","host_v_mag":8.2,"eccentricity":0.12,"uncertainties":{"mass_kg":[1.8981341134201343e+26,1.8981341134201343e+26],"distance_ly":[0.621654055928113,0.6255679324607138],"eccentricity":[0.01,0.01],"host_mass_solar":[0.09,0.09],"inclination_deg":[28,30],"host_radius_solar":[0.02,0.02],"host_temperature_k":[23,23],"orbital_period_days":[0.00021,0.00021],"argument_of_periastron_deg":[1,1.1]},"host_mass_solar":1.28,"inclination_deg":83,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":1.19,"planets_in_system":2,"discovery_facility":"Multiple Observatories","host_spectral_type":"G2 V","host_temperature_k":5932,"orbital_period_days":6.27711,"periastron_epoch_bjd":2451548.84,"transit_midpoint_bjd":2451549.717,"equilibrium_temperature_k":1179.39,"argument_of_periastron_deg":40.4},"designations":[{"catalog":"Exoplanet","designation":"HD 68988 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."}