{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.685","julian_year":2026.685,"time":"2026-09-08T04:50:14.366Z","years_from_j2000":26.685,"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-102843-b","name":"HD 102843 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":204.68921952747385,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":177.5854673,"dec_deg":-1.2522989,"epoch_ra_deg":177.929562,"epoch_dec_deg":-1.401686,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 102843","semi_major_axis_km":609461725.2318,"periapsis_km":null,"mass_kg":6.80229920141438e+26,"mass_msun":0.000342097,"constellation":"Virgo","discovered":"2019","featured":false,"url":"https://spacecatalog.org/object/hd-102843-b","radius_km":83553.11,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 102843","host_v_mag":9.26,"eccentricity":0.11,"uncertainties":{"mass_kg":[8.6596434082975e+25,8.6596434082975e+25],"distance_ly":[0.6885161133600454,0.6927561462703631],"eccentricity":[0.07,0.07],"host_mass_solar":[0.05,0.05],"host_radius_solar":[0.048817,0.02493],"host_temperature_k":[69,144],"semi_major_axis_km":[40391425.089,40391425.089],"orbital_period_days":[295.049,295.049],"argument_of_periastron_deg":[49.38,49.38]},"host_mass_solar":0.95,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":0.961488,"planets_in_system":1,"discovery_facility":"Las Campanas Observatory","host_spectral_type":"K0 V","host_temperature_k":5436,"orbital_period_days":3090.942,"equilibrium_temperature_k":127.34,"argument_of_periastron_deg":108.69},"designations":[{"catalog":"Exoplanet","designation":"HD 102843 b"},{"catalog":"Host star","designation":"HD 102843"}],"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."}