{"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":"2026-09-07T03:22:28.682Z","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-15337-c","name":"HD 15337 c","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":146.16861145564715,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":36.8678846,"dec_deg":-27.6361171,"epoch_ra_deg":37.166053,"epoch_dec_deg":-27.515307,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 15337","semi_major_axis_km":18475337.03145,"periapsis_km":null,"mass_kg":4.056296415803905e+25,"mass_msun":0.0000203997,"constellation":"Fornax","discovered":"2019","featured":false,"url":"https://spacecatalog.org/object/hd-15337-c","radius_km":16111.0806,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 15337","host_v_mag":9.1,"eccentricity":0.096,"uncertainties":{"mass_kg":[6.826187872885547e+24,7.775762563864376e+24],"radius_km":[478.3575,548.5166],"distance_ly":[0.2296140899125874,0.23059255904573758],"eccentricity":[0.045,0.059],"host_mass_solar":[0.038,0.038],"inclination_deg":[0.07,0.07],"host_radius_solar":[0.008,0.008],"host_temperature_k":[74,74],"semi_major_axis_km":[254316.38018999997,299195.7414],"orbital_period_days":[0.000026,0.000021],"argument_of_periastron_deg":[63.3,77.89]},"host_mass_solar":0.829,"inclination_deg":88.41,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.855,"planets_in_system":2,"discovery_facility":"Transiting Exoplanet Survey Satellite (TESS)","host_spectral_type":"K1 V","host_temperature_k":5131,"orbital_period_days":17.180546,"transit_midpoint_bjd":2458414.55162,"equilibrium_temperature_k":656.1,"argument_of_periastron_deg":56.63},"designations":[{"catalog":"Exoplanet","designation":"HD 15337 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."}