{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.685","julian_year":2026.685,"time":"2026-09-08T02:31:10.766Z","years_from_j2000":26.685,"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":"toi-3261-b","name":"TOI-3261 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":978.9290136428109,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":47.7285242,"dec_deg":-73.531972,"epoch_ra_deg":47.704881,"epoch_dec_deg":-73.42962,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"TOI-3261","semi_major_axis_km":2564107.5037979996,"periapsis_km":null,"mass_kg":1.809566863940788e+26,"mass_msun":0.0000910057,"constellation":"Hydrus","discovered":"2024","featured":false,"url":"https://spacecatalog.org/object/toi-3261-b","radius_km":24364.342,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"TOI-3261","host_v_mag":13.261,"eccentricity":0,"uncertainties":{"mass_kg":[1.433320288269931e+25,1.3138769309141034e+25],"radius_km":[2232.335,2678.802],"distance_ly":[3.5029194966778245,3.529012006895164],"host_mass_solar":[0.03,0.02],"inclination_deg":[1.5,1.8],"host_radius_solar":[0.017,0.024],"host_temperature_k":[42,61],"semi_major_axis_km":[29919.57414,19447.723190999997],"orbital_period_days":[0.000001,0.000001]},"host_mass_solar":0.861,"inclination_deg":87.8,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.849,"planets_in_system":1,"discovery_facility":"Transiting Exoplanet Survey Satellite (TESS)","host_spectral_type":"K1.5+/-1","host_temperature_k":5068,"orbital_period_days":0.8831331,"transit_midpoint_bjd":2459112.40036,"equilibrium_temperature_k":1722,"argument_of_periastron_deg":0},"designations":[{"catalog":"Exoplanet","designation":"TOI-3261 b"},{"catalog":"Host star","designation":"TOI-3261"}],"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."}