{"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":"2026-09-06T18:30:10.183Z","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-107148-c","name":"HD 107148 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":161.17213098699506,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":184.8059773,"dec_deg":-3.3199927,"epoch_ra_deg":185.150832,"epoch_dec_deg":-3.469192,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 107148","semi_major_axis_km":21048420.407489996,"periapsis_km":null,"mass_kg":1.188225999555206e+26,"mass_msun":0.0000597576,"constellation":"Virgo","discovered":"2021","featured":false,"url":"https://spacecatalog.org/object/hd-107148-c","radius_km":29977.070000000003,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 107148","host_v_mag":8.01,"eccentricity":0.34,"uncertainties":{"mass_kg":[1.8601621085976898e+25,1.8411808630181743e+25],"distance_ly":[0.3763844598851219,0.37834139815142237],"eccentricity":[0.16,0.13],"host_mass_solar":[0.043011,0.043011],"host_radius_solar":[0.026697,0.026697],"host_temperature_k":[86.22,86.22],"semi_major_axis_km":[284235.95433,269276.16725999996],"orbital_period_days":[0.0024,0.0022],"argument_of_periastron_deg":[24.0642,38.3882]},"host_mass_solar":1.105215,"stars_in_system":2,"discovery_method":"Radial Velocity","host_radius_solar":1.169193,"planets_in_system":2,"discovery_facility":"Multiple Observatories","host_spectral_type":"G5 V","host_temperature_k":5752.92,"orbital_period_days":18.3267,"transit_midpoint_bjd":2455203.4,"equilibrium_temperature_k":799.68,"argument_of_periastron_deg":-44.6907},"designations":[{"catalog":"Exoplanet","designation":"HD 107148 c"},{"catalog":"Host star","designation":"HD 107148"}],"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."}