{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.816","julian_year":2026.816,"time":"2026-10-26T03:00:39.291Z","years_from_j2000":26.816,"frame":"date","applied":"Proper motion, then precession and nutation. The catalogued position is carried along the great circle the object's own published motion puts it on, at a constant velocity, from the epoch that position was measured at, 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. The motion runs from position_epoch_jyear where the upstream publishes one — a timed pulsar's position belongs to the year it was timed — and from J2000 where it does not. 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-j0534p2200","name":"Crab Pulsar","class":"pulsar","category":"neutron_star","object_type":"Pulsar","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":6153.893919183837,"distance_method":"pulsar parallax (timing or VLBI)","ra_deg":83.63305654166666,"dec_deg":22.014497972222223,"epoch_ra_deg":84.038871,"epoch_dec_deg":22.032798,"epoch_moved_arcsec":0.117,"pm_ra_mas_yr":-11.34,"pm_dec_mas_yr":2.65,"position_epoch_jyear":2016.798083504449,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Taurus","discovered":"1968","featured":true,"url":"https://spacecatalog.org/object/psr-j0534p2200","source":{"id":"atnf","name":"ATNF Pulsar Catalogue (Manchester+ 2005)","url":"https://www.atnf.csiro.au/research/pulsar/psrcat","license":"No licence stated; the database is ATNF/CSIRO property under the CSIRO Legal Notice and Disclaimer","attribution":"Manchester, R. N., Hobbs, G. B., Teoh, A. & Hobbs, M. 2005, AJ 129, 1993 (2005AJ....129.1993M); https://www.atnf.csiro.au/research/pulsar/psrcat","commercial_use":"needs_permission"},"radius_km":null,"radius_kind":null,"data_quality":null,"description":"The neutron star left by the supernova Chinese and Japanese astronomers recorded in 1054, turning thirty times a second at the heart of the nebula that explosion blew off. It is the best-studied pulsar there is, and the power it loses as it slows is where the whole nebula gets its light.","properties":{"associations":"GRS:4FGL_J0534.5+2200[aab+22],SNR:Crab[ccl+69],PWN:Crab[ccl+69],GRS:HESS_J0534+220[aab+06b]","spin_period_s":0.033392412302258895,"uncertainties":{"distance_ly":[625.8197205949664,785.6034790447457],"proper_motion_ra_mas_yr":[0.06,0.06],"proper_motion_dec_mas_yr":[0.14,0.14]},"position_epoch_jyear":2016.798083504449,"spin_period_derivative":4.209716096219071e-13,"proper_motion_ra_mas_yr":-11.34,"radio_flux_1400_mhz_mjy":14,"characteristic_age_years":1256.785100433024,"position_uncertainty_mas":1.3955616155388064,"proper_motion_dec_mas_yr":2.65,"dispersion_measure_pc_cm3":56.7712,"spin_down_luminosity_erg_s":4.4634344638985064e+38,"surface_magnetic_field_gauss":3794025795561.3936},"designations":[{"catalog":"ATNF","designation":"B0531+21"},{"catalog":"ATNF","designation":"J0534+2200"},{"catalog":"ATNF","designation":"PSR B0531+21"},{"catalog":"ATNF","designation":"PSR J0534+2200"},{"catalog":"Common name","designation":"Crab pulsar"},{"catalog":"Common name","designation":"Crab Pulsar"},{"catalog":"Common name","designation":"PSR J0534+2200"}],"updated_at":"2026-10-01T09:42:28.932Z","citation":{"plain":"SpaceCatalog. Crab Pulsar [catalogue entry]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/psr-j0534p2200","bibtex":"@misc{spacecatalog_psr-j0534p2200,\n  author       = {{SpaceCatalog}},\n  title        = {{Crab Pulsar}},\n  howpublished = {SpaceCatalog, data release DR1 (2026-08-21)},\n  year         = {2026},\n  url          = {https://spacecatalog.org/object/psr-j0534p2200},\n  note         = {Catalogue entry, data release DR1 (2026-08-21). Values from ATNF Pulsar Catalogue (Manchester+ 2005).}\n}","url":"https://spacecatalog.org/object/psr-j0534p2200","release":"DR1","doi":null},"references":[],"attribution":"Data from SpaceCatalog.org. Each record names its upstream in `source`, with that producer's terms in `source.license`, the acknowledgement it asks for in `source.attribution`, and whether its terms allow commercial use in `source.commercial_use`; those terms govern the record, and citing SpaceCatalog does not discharge them."}