{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.819","julian_year":2026.819,"time":"2026-10-27T07:43:40.665Z","years_from_j2000":26.819,"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-j1813m1749","name":"PSR J1813-1749","class":"pulsar","category":"neutron_star","object_type":"Pulsar","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":20048.832538248218,"distance_method":"dispersion measure through the YMW16 electron-density model","ra_deg":273.3965833333333,"dec_deg":-17.832644444444444,"epoch_ra_deg":273.790415,"epoch_dec_deg":-17.825422,"epoch_moved_arcsec":0.124,"pm_ra_mas_yr":-5,"pm_dec_mas_yr":-13,"position_epoch_jyear":2017.9206023271731,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Sagittarius","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/psr-j1813m1749","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":null,"properties":{"associations":"SNR:12.8-0.0,GRS:HESS_J1813-178,XRS:CXOU_J181335.16-174957.4[hgp+20]","spin_period_s":0.04474055970362699,"uncertainties":{"proper_motion_ra_mas_yr":[4,4],"proper_motion_dec_mas_yr":[7,7]},"position_epoch_jyear":2017.9206023271731,"spin_period_derivative":1.2699897837216434e-13,"proper_motion_ra_mas_yr":-5,"characteristic_age_years":5581.709407861183,"position_uncertainty_mas":182.79997608595892,"proper_motion_dec_mas_yr":-13,"dispersion_measure_pc_cm3":1087,"spin_down_luminosity_erg_s":5.598294302754123e+37,"surface_magnetic_field_gauss":2412130490487.461},"designations":[{"catalog":"ATNF","designation":"J1813-1749"},{"catalog":"ATNF","designation":"PSR J1813-1749"}],"updated_at":"2026-10-01T09:42:28.932Z","citation":{"plain":"SpaceCatalog. PSR J1813-1749 [catalogue entry]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/psr-j1813m1749","bibtex":"@misc{spacecatalog_psr-j1813m1749,\n  author       = {{SpaceCatalog}},\n  title        = {{PSR J1813-1749}},\n  howpublished = {SpaceCatalog, data release DR1 (2026-08-21)},\n  year         = {2026},\n  url          = {https://spacecatalog.org/object/psr-j1813m1749},\n  note         = {Catalogue entry, data release DR1 (2026-08-21). Values from ATNF Pulsar Catalogue (Manchester+ 2005).}\n}","url":"https://spacecatalog.org/object/psr-j1813m1749","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."}