{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.678","julian_year":2026.678,"time":"2026-09-05T13:14:06.406Z","years_from_j2000":26.678,"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-544-c","name":"TOI-544 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":134.10441320028252,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":82.2900716,"dec_deg":-0.3428983,"epoch_ra_deg":82.633369,"epoch_dec_deg":-0.321012,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"TOI-544","semi_major_axis_km":null,"periapsis_km":null,"mass_kg":1.2840160915751465e+26,"mass_msun":0.000064575,"constellation":"Orion","discovered":"2023","featured":false,"url":"https://spacecatalog.org/object/toi-544-c","radius_km":31380.252,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"TOI-544","host_v_mag":10.777,"eccentricity":0.32,"uncertainties":{"mass_kg":[1.1944335735582758e+25,1.1944335735582758e+25],"distance_ly":[0.2387464684886562,0.24005109399952315],"eccentricity":[0.09,0.08],"host_mass_solar":[0.018,0.018],"host_radius_solar":[0.012,0.012],"host_temperature_k":[70,70],"orbital_period_days":[0.24,0.24],"argument_of_periastron_deg":[17,19]},"host_mass_solar":0.631,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":0.623,"planets_in_system":2,"discovery_facility":"La Silla Observatory","host_temperature_k":4169,"orbital_period_days":50.089,"periastron_epoch_bjd":2459205.4,"transit_midpoint_bjd":2459212,"argument_of_periastron_deg":11},"designations":[{"catalog":"Exoplanet","designation":"TOI-544 c"},{"catalog":"Host star","designation":"TOI-544"}],"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."}