{"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":"2026-09-07T02:40:07.010Z","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-4274-c","name":"GJ 4274 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":23.599240403521602,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":335.7805478,"dec_deg":-17.6104078,"epoch_ra_deg":336.144708,"epoch_dec_deg":-17.474743,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"GJ 4274","semi_major_axis_km":27825203.9502,"periapsis_km":null,"mass_kg":5.010648841076967e+25,"mass_msun":0.0000251993,"constellation":"Aquarius","discovered":"2026","featured":false,"url":"https://spacecatalog.org/object/gj-4274-c","radius_km":18050.023,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"GJ 4274","host_v_mag":13.31,"uncertainties":{"mass_kg":[9.376303552432465e+24,1.0033242017889517e+25],"distance_ly":[0.04266125420535004,0.04282433239420841],"host_mass_solar":[0.03,0.03],"host_radius_solar":[0.01,0.01],"host_temperature_k":[19,19],"semi_major_axis_km":[1495978.707,1495978.707],"orbital_period_days":[1.14,0.32]},"host_mass_solar":0.18,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":0.19,"planets_in_system":2,"discovery_facility":"Mauna Kea Observatory","host_spectral_type":"M4.5 V","host_temperature_k":3228,"orbital_period_days":69.57,"transit_midpoint_bjd":2460097.87,"equilibrium_temperature_k":157.32},"designations":[{"catalog":"Exoplanet","designation":"GJ 4274 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."}