{"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":"2026-09-07T04:03:21.935Z","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":"ross-176-b","name":"Ross 176 b","class":"super_earth","category":"exoplanet","object_type":"Super-Earth","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":151.49572357289472,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":305.6897438,"dec_deg":47.3086191,"epoch_ra_deg":305.900814,"epoch_dec_deg":47.394239,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Ross 176","semi_major_axis_km":6941341.200479999,"periapsis_km":null,"mass_kg":2.7292807155806606e+25,"mass_msun":0.0000137259,"constellation":"Cygnus","discovered":"2025","featured":false,"url":"https://spacecatalog.org/object/ross-176-b","radius_km":11735.704000000002,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Ross 176","host_v_mag":11.524,"eccentricity":0.25,"uncertainties":{"mass_kg":[5.554116117045983e+24,5.315229402334328e+24],"radius_km":[510.24800000000005,510.24800000000005],"distance_ly":[0.16633975263553913,0.16633975263553913],"eccentricity":[0.04,0.04],"host_mass_solar":[0.024,0.024],"inclination_deg":[0.49,0.37],"host_radius_solar":[0.02,0.02],"host_temperature_k":[69,69],"semi_major_axis_km":[149597.8707,179517.44483999998],"orbital_period_days":[0.000007,0.000008],"argument_of_periastron_deg":[23,19]},"host_mass_solar":0.577,"inclination_deg":89.42,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.569,"planets_in_system":1,"discovery_facility":"Transiting Exoplanet Survey Satellite (TESS)","host_spectral_type":"K7 V","host_temperature_k":4041,"orbital_period_days":5.0066338,"transit_midpoint_bjd":2459829.7627,"equilibrium_temperature_k":682,"argument_of_periastron_deg":101},"designations":[{"catalog":"Exoplanet","designation":"Ross 176 b"},{"catalog":"Host star","designation":"Ross 176"}],"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."}