{"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":"2026-09-07T05:10:17.199Z","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":"gj-536-b","name":"GJ 536 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":33.95026966929126,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":210.2597264,"dec_deg":-2.6522901,"epoch_ra_deg":210.60747,"epoch_dec_deg":-2.782419,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"GJ 536","semi_major_axis_km":9993137.762759998,"periapsis_km":null,"mass_kg":3.8042709317831085e+25,"mass_msun":0.0000191322,"constellation":"Virgo","discovered":"2016","featured":false,"url":"https://spacecatalog.org/object/gj-536-b","radius_km":15371.221000000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"GJ 536","host_v_mag":9.71,"eccentricity":0,"uncertainties":{"mass_kg":[2.269423789760724e+24,2.269423789760724e+24],"distance_ly":[0.031147934071948994,0.031147934071948994],"host_mass_solar":[0.027,0.027],"host_radius_solar":[0.022,0.022],"host_temperature_k":[88,88],"semi_major_axis_km":[179517.44483999998,179517.44483999998],"orbital_period_days":[0.00056,0.00056],"argument_of_periastron_deg":[42.8,36.9]},"host_mass_solar":0.528,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":0.529,"planets_in_system":2,"discovery_facility":"La Silla Observatory","host_spectral_type":"M1 V","host_temperature_k":3641,"orbital_period_days":8.70874,"transit_midpoint_bjd":2460553.1,"equilibrium_temperature_k":451,"argument_of_periastron_deg":19.2},"designations":[{"catalog":"Exoplanet","designation":"GJ 536 b"},{"catalog":"Host star","designation":"GJ 536"}],"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."}