{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.681","julian_year":2026.681,"time":"2026-09-06T18:28:10.200Z","years_from_j2000":26.681,"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-87816-c","name":"HD 87816 c","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":434.5479267233488,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":151.5296524,"dec_deg":-52.1878679,"epoch_ra_deg":151.779542,"epoch_dec_deg":-52.31841,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 87816","semi_major_axis_km":1516922408.898,"periapsis_km":null,"mass_kg":2.315712011703199e+28,"mass_msun":0.011646,"constellation":"Vela","discovered":"2025","featured":false,"url":"https://spacecatalog.org/object/hd-87816-c","radius_km":79088.44,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 87816","host_v_mag":6.5,"eccentricity":0.19,"uncertainties":{"mass_kg":[3.018018113613186e+27,4.0809678894769494e+27],"distance_ly":[1.7612444396704146,1.7612444396704146],"eccentricity":[0.07,0.07],"host_mass_solar":[0.1,0.1],"host_radius_solar":[0.19,0.19],"host_temperature_k":[46,46],"semi_major_axis_km":[71806977.93599999,148101891.993],"orbital_period_days":[535,1140],"argument_of_periastron_deg":[22.61,16.43]},"host_mass_solar":2.41,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":9,"planets_in_system":2,"discovery_facility":"La Silla Observatory","host_spectral_type":"K0 III","host_temperature_k":4989,"orbital_period_days":7596,"equilibrium_temperature_k":226.65,"argument_of_periastron_deg":110.44},"designations":[{"catalog":"Exoplanet","designation":"HD 87816 c"}],"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."}