{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.677","julian_year":2026.677,"time":"2026-09-05T07:07:37.842Z","years_from_j2000":26.677,"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-95338-b","name":"HD 95338 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":120.65861652890979,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":164.8563364,"dec_deg":-56.6235564,"epoch_ra_deg":165.138196,"epoch_dec_deg":-56.767397,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 95338","semi_major_axis_km":39194642.123399995,"periapsis_km":null,"mass_kg":2.5620600152825017e+26,"mass_msun":0.00012885,"constellation":"Vela","discovered":"2020","featured":false,"url":"https://spacecatalog.org/object/hd-95338-b","radius_km":27245.601094374,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 95338","host_v_mag":8.62,"eccentricity":0.197,"uncertainties":{"mass_kg":[1.2541552522361896e+25,1.3138769309141034e+25],"radius_km":[250.221983683,250.221983683],"distance_ly":[0.2240694314914027,0.22472174424683622],"eccentricity":[0.024,0.029],"host_mass_solar":[0.047,0.047],"inclination_deg":[0.0155,0.0155],"host_radius_solar":[0.006,0.006],"host_temperature_k":[77,77],"semi_major_axis_km":[299195.7414,299195.7414],"orbital_period_days":[0.000018,0.000018],"argument_of_periastron_deg":[11.99,11.53]},"host_mass_solar":0.848,"inclination_deg":89.654,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":0.868,"planets_in_system":1,"discovery_facility":"Las Campanas Observatory","host_spectral_type":"K0.5 V","host_temperature_k":5097,"orbital_period_days":55.082694,"transit_midpoint_bjd":2458585.28087,"equilibrium_temperature_k":443,"argument_of_periastron_deg":23.42},"designations":[{"catalog":"Exoplanet","designation":"HD 95338 b"},{"catalog":"Host star","designation":"HD 95338"}],"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."}