{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.683","julian_year":2026.683,"time":"2026-09-07T08:09:29.500Z","years_from_j2000":26.683,"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-3090-c","name":"GJ 3090 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":73.3039720482158,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":20.4384281,"dec_deg":-46.7147234,"epoch_ra_deg":20.72926,"epoch_dec_deg":-46.573888,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"GJ 3090","semi_major_axis_km":14914907.708789999,"periapsis_km":null,"mass_kg":5.972167867791379e+25,"mass_msun":0.0000300349,"constellation":"Phoenix","discovered":"2026","featured":false,"url":"https://spacecatalog.org/object/gj-3090-c","radius_km":20027.234,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"GJ 3090","host_v_mag":11.403,"eccentricity":0,"uncertainties":{"mass_kg":[7.763818228128793e+24,7.763818228128793e+24],"distance_ly":[0.08496373639521167,0.08496373639521167],"host_mass_solar":[0.013,0.013],"host_radius_solar":[0.016,0.016],"host_temperature_k":[32,32],"semi_major_axis_km":[119678.29656,119678.29656],"orbital_period_days":[0.0058,0.0058]},"host_mass_solar":0.519,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":0.516,"planets_in_system":2,"discovery_facility":"Multiple Facilities","host_spectral_type":"M2 V","host_temperature_k":3707,"orbital_period_days":15.9407,"transit_midpoint_bjd":2458350.83,"equilibrium_temperature_k":407.2,"argument_of_periastron_deg":90},"designations":[{"catalog":"Exoplanet","designation":"GJ 3090 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."}