{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.680","julian_year":2026.68,"time":"2026-09-06T06:04:56.113Z","years_from_j2000":26.68,"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-5278-b","name":"HD 5278 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":187.81584548267583,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":12.5467785,"dec_deg":-83.7437671,"epoch_ra_deg":12.617422,"epoch_dec_deg":-83.597307,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 5278","semi_major_axis_km":17981664.05814,"periapsis_km":null,"mass_kg":4.658290936877275e+25,"mass_msun":0.0000234272,"constellation":"Octans","discovered":"2021","featured":false,"url":"https://spacecatalog.org/object/hd-5278-b","radius_km":15626.345000000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 5278","host_v_mag":7.94,"eccentricity":0.08,"uncertainties":{"mass_kg":[8.361035014907931e+24,8.958251801687069e+24],"radius_km":[318.90500000000003,318.90500000000003],"distance_ly":[0.307565464186889,0.30887008969775603],"eccentricity":[0.05,0.09],"host_mass_solar":[0.035,0.036],"inclination_deg":[0.48,0.47],"host_radius_solar":[0.016,0.017],"host_temperature_k":[64,64],"semi_major_axis_km":[194477.23190999997,194477.23190999997],"orbital_period_days":[0.000047,0.000049],"argument_of_periastron_deg":[280,34]},"host_mass_solar":1.126,"inclination_deg":89.27,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.194,"planets_in_system":2,"discovery_facility":"Transiting Exoplanet Survey Satellite (TESS)","host_spectral_type":"F V","host_temperature_k":6203,"orbital_period_days":14.339156,"transit_midpoint_bjd":2458680.69932,"equilibrium_temperature_k":943,"argument_of_periastron_deg":135},"designations":[{"catalog":"Exoplanet","designation":"HD 5278 b"},{"catalog":"Host star","designation":"HD 5278"}],"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."}