{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.684","julian_year":2026.684,"time":"2026-09-07T18:57:34.446Z","years_from_j2000":26.684,"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-j0437m4715","name":"PSR J0437-4715","class":"millisecond_pulsar","category":"neutron_star","object_type":"Millisecond pulsar","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":507.24164497160723,"distance_method":"pulsar parallax (timing or VLBI)","ra_deg":69.31636834958334,"dec_deg":-47.252584363055554,"epoch_ra_deg":69.510157,"epoch_dec_deg":-47.197829,"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":"Pictor","discovered":"1993","featured":true,"url":"https://spacecatalog.org/object/psr-j0437m4715","radius_km":null,"radius_kind":null,"data_quality":null,"description":"The nearest and brightest millisecond pulsar, close enough that its distance is known by parallax to better than a per cent. It keeps time well enough to be one of the anchors of the pulsar timing arrays now watching for gravitational waves with periods of years.","properties":{"associations":"GRS:4FGL_J0437.2-4715[aab+22],OPT:[bbm+95]","binary_model":"T2","spin_period_s":0.005757451941593412,"uncertainties":{"distance_ly":[3.1359607107982015,3.1752215647675257]},"spin_period_derivative":5.729220049814834e-20,"radio_flux_1400_mhz_mjy":150.2,"characteristic_age_years":1592211864.1276486,"dispersion_measure_pc_cm3":2.64539,"spin_down_luminosity_erg_s":1.1851253156212893e+34,"surface_magnetic_field_gauss":581182984.2486207},"designations":[{"catalog":"ATNF","designation":"J0437-4715"},{"catalog":"ATNF","designation":"PSR J0437-4715"}],"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."}