{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.679","julian_year":2026.679,"time":"2026-09-05T22:40:32.405Z","years_from_j2000":26.679,"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":"hd-95544-b","name":"HD 95544 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":286.38128129780887,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":166.3231784,"dec_deg":81.0389868,"epoch_ra_deg":166.899175,"epoch_dec_deg":80.894036,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 95544","semi_major_axis_km":473626858.63619995,"periapsis_km":null,"mass_kg":1.1428608215153133e+28,"mass_msun":0.00574761,"constellation":"Camelopardalis","discovered":"2021","featured":false,"url":"https://spacecatalog.org/object/hd-95544-b","radius_km":81639.68000000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 95544","host_v_mag":8.39,"eccentricity":0.049,"uncertainties":{"mass_kg":[4.897161467611226e+26,3.0673693531949166e+27],"distance_ly":[0.6594881957432551,0.6624236031427059],"eccentricity":[0.029,0.045],"host_mass_solar":[0.138,0.138],"inclination_deg":[24.601,31.19],"host_radius_solar":[0.072,0.072],"host_temperature_k":[15,15],"semi_major_axis_km":[37399467.675,43981773.98579999],"orbital_period_days":[184.27313,262.59531],"argument_of_periastron_deg":[73.196,31.71]},"host_mass_solar":1.01,"inclination_deg":86.497,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":1.088,"planets_in_system":1,"discovery_facility":"Haute-Provence Observatory","host_spectral_type":"G0","host_temperature_k":5722,"orbital_period_days":2041.54152,"periastron_epoch_bjd":2454448.617,"equilibrium_temperature_k":156.5,"argument_of_periastron_deg":151.528},"designations":[{"catalog":"Exoplanet","designation":"HD 95544 b"},{"catalog":"Host star","designation":"HD 95544"}],"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."}