{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.687","julian_year":2026.687,"time":"2026-09-09T02:17:20.715Z","years_from_j2000":26.687,"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":"psr-j0806m4123","name":"PSR J0806-4123","class":"x_ray_isolated_neutron_star","category":"neutron_star","object_type":"X-ray isolated neutron star","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":null,"distance_method":null,"ra_deg":121.59750000000001,"dec_deg":-41.37525,"epoch_ra_deg":121.828481,"epoch_dec_deg":-41.451917,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Puppis","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/psr-j0806m4123","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"associations":"XRS:RX_J0806.4-4123[hmp98],OPT:[kkvh11]","spin_period_s":11.370385928090423,"spin_period_derivative":5.5592840746098175e-14,"characteristic_age_years":3240577.2302076207,"spin_down_luminosity_erg_s":1.4929765513002815e+30,"surface_magnetic_field_gauss":25441751972317.76},"designations":[{"catalog":"ATNF","designation":"J0806-4123"},{"catalog":"ATNF","designation":"PSR J0806-4123"}],"source":{"id":"atnf","name":"ATNF Pulsar Catalogue (Manchester+ 2005)","url":"https://www.atnf.csiro.au/research/pulsar/psrcat","license":"Free to use with attribution; cite Manchester+ 2005 (2005AJ....129.1993M)"},"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."}