{"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":"2026-09-08T17:09:51.379Z","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":"hip-107772-b","name":"HIP 107772 b","class":"neptune_like_planet","category":"exoplanet","object_type":"Neptune-like planet","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":77.11445700908051,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":327.4977057,"dec_deg":-41.2440371,"epoch_ra_deg":327.913645,"epoch_dec_deg":-41.118816,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HIP 107772","semi_major_axis_km":36352282.58009999,"periapsis_km":null,"mass_kg":7.704096549450879e+25,"mass_msun":0.000038745,"constellation":"Grus","discovered":"2020","featured":false,"url":"https://spacecatalog.org/object/hip-107772-b","radius_km":23216.284000000003,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HIP 107772","host_v_mag":10.56,"eccentricity":0.18,"uncertainties":{"mass_kg":[1.7916503603374138e+25,1.7916503603374138e+25],"distance_ly":[0.0789298434074519,0.07925599978516865],"eccentricity":[0.11,0.11],"host_mass_solar":[0.08,0.08],"host_radius_solar":[0.051538,0.031423],"host_temperature_k":[153.81,98],"semi_major_axis_km":[1645576.5776999998,1645576.5776999998],"orbital_period_days":[0.083,0.083],"argument_of_periastron_deg":[72,72]},"host_mass_solar":0.63,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":0.513922,"planets_in_system":1,"discovery_facility":"Multiple Observatories","host_spectral_type":"M0 V","host_temperature_k":4006,"orbital_period_days":55.199,"periastron_epoch_bjd":2453199.6,"equilibrium_temperature_k":280.92,"argument_of_periastron_deg":151},"designations":[{"catalog":"Exoplanet","designation":"HIP 107772 b"},{"catalog":"Host star","designation":"HIP 107772"}],"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."}