{"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":"2026-09-06T23:21:19.841Z","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-93351-b","name":"HD 93351 b","class":"super_earth","category":"exoplanet","object_type":"Super-Earth","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":183.1792064170546,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":161.6779279,"dec_deg":-1.6885763,"epoch_ra_deg":162.02066,"epoch_dec_deg":-1.829987,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 93351","semi_major_axis_km":5235925.4745000005,"periapsis_km":null,"mass_kg":2.087937061524043e+25,"mass_msun":0.0000105005,"constellation":"Sextans","discovered":"2022","featured":false,"url":"https://spacecatalog.org/object/hd-93351-b","radius_km":10778.989,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 93351","host_v_mag":9.12,"eccentricity":0.549,"uncertainties":{"mass_kg":[5.694373793297995e+24,3.79624917562477e+24],"distance_ly":[0.4099785667899465,0.4112831923008134],"eccentricity":[0.286,0.141],"host_mass_solar":[0.121,0.121],"host_radius_solar":[0.04919,0.043754],"host_temperature_k":[104.92,132.03],"semi_major_axis_km":[299195.7414,149597.8707],"orbital_period_days":[0.00011,0.00017],"argument_of_periastron_deg":[28.885,26.724]},"host_mass_solar":0.94,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":0.911435,"planets_in_system":2,"discovery_facility":"Multiple Observatories","host_temperature_k":5408,"orbital_period_days":2.45946,"periastron_epoch_bjd":2453062.554,"equilibrium_temperature_k":1330.76,"argument_of_periastron_deg":330.575},"designations":[{"catalog":"Exoplanet","designation":"HD 93351 b"},{"catalog":"Host star","designation":"HD 93351"}],"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."}