{"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":"2026-09-07T08:07:37.669Z","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":"toi-849-b","name":"TOI-849 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":736.2458376751136,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":28.7157956,"dec_deg":-29.4217086,"epoch_ra_deg":29.020559,"epoch_dec_deg":-29.28961,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"TOI-849","semi_major_axis_km":2318766.9958499996,"periapsis_km":null,"mass_kg":2.4963661687367963e+26,"mass_msun":0.000125546,"constellation":"Fornax","discovered":"2020","featured":false,"url":"https://spacecatalog.org/object/toi-849-b","radius_km":23216.284000000003,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"TOI-849","host_v_mag":11.981,"eccentricity":0,"uncertainties":{"mass_kg":[1.433320288269931e+25,1.4930419669478448e+25],"radius_km":[2423.6780000000003,2423.6780000000003],"distance_ly":[5.045639163278021,5.117393566375704],"host_mass_solar":[0.04,0.04],"inclination_deg":[2.4,2.1],"host_radius_solar":[0.1,0.1],"host_temperature_k":[116,108],"semi_major_axis_km":[44879.361209999995,44879.361209999995],"orbital_period_days":[0.000053,0.000053]},"host_mass_solar":0.97,"inclination_deg":86.8,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.97,"planets_in_system":1,"discovery_facility":"Transiting Exoplanet Survey Satellite (TESS)","host_spectral_type":"G","host_temperature_k":5257,"orbital_period_days":0.765548,"transit_midpoint_bjd":2458871.6812,"equilibrium_temperature_k":1932,"argument_of_periastron_deg":90},"designations":[{"catalog":"Exoplanet","designation":"TOI-849 b"},{"catalog":"Host star","designation":"TOI-849"}],"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."}