{"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":"2026-09-06T23:12:58.731Z","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":"toi-1691-b","name":"TOI-1691 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":363.4849751464247,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":272.4041179,"dec_deg":86.860343,"epoch_ra_deg":270.020685,"epoch_dec_deg":86.861213,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"TOI-1691","semi_major_axis_km":19352728.543105498,"periapsis_km":null,"mass_kg":8.719365086975413e+25,"mass_msun":0.0000438509,"constellation":"Ursa Minor","discovered":"2024","featured":false,"url":"https://spacecatalog.org/object/toi-1691-b","radius_km":23343.846,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"TOI-1691","host_v_mag":10.134,"eccentricity":0,"uncertainties":{"mass_kg":[3.1652489699294308e+25,3.2249706486073448e+25],"radius_km":[1320.2667,1505.2316],"distance_ly":[1.1969939062204482,1.2067785975519507],"host_mass_solar":[0.14,0.14],"host_radius_solar":[0.05,0.05],"host_temperature_k":[187,187],"semi_major_axis_km":[937679.4535476,856597.4076282],"orbital_period_days":[0.000018237,0.000018196]},"host_mass_solar":1.03,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1,"planets_in_system":1,"discovery_facility":"Transiting Exoplanet Survey Satellite (TESS)","host_temperature_k":5759,"orbital_period_days":16.736888935,"transit_midpoint_bjd":2459922.7255,"equilibrium_temperature_k":703.49,"argument_of_periastron_deg":90},"designations":[{"catalog":"Exoplanet","designation":"TOI-1691 b"},{"catalog":"Host star","designation":"TOI-1691"}],"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."}