{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.820","julian_year":2026.82,"time":"2026-10-27T09:55:42.890Z","years_from_j2000":26.82,"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-j1804m2717","name":"PSR J1804-2717","class":"millisecond_pulsar","category":"neutron_star","object_type":"Millisecond pulsar","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":2965.0579792431217,"distance_method":"pulsar parallax (timing or VLBI)","ra_deg":271.0880544583334,"dec_deg":-27.292038055555558,"epoch_ra_deg":271.511141,"epoch_dec_deg":-27.290873,"epoch_moved_arcsec":0.293,"pm_ra_mas_yr":-0.00012,"pm_dec_mas_yr":-16.9,"position_epoch_jyear":2009.460643394935,"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-j1804m2717","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":{"binary_model":"DD","spin_period_s":0.00934303084453923,"uncertainties":{"distance_ly":[635.3695669806689,1111.8967422161709],"proper_motion_ra_mas_yr":[0.00009,0.00009],"proper_motion_dec_mas_yr":[0.4,0.4]},"position_epoch_jyear":2009.460643394935,"spin_period_derivative":4.0863236536464796e-20,"proper_motion_ra_mas_yr":-0.00012,"radio_flux_1400_mhz_mjy":0.4,"characteristic_age_years":3622605634.61175,"position_uncertainty_mas":3.002960116544182,"proper_motion_dec_mas_yr":-16.9,"dispersion_measure_pc_cm3":24.6746,"spin_down_luminosity_erg_s":1.9780130405705842e+33,"surface_magnetic_field_gauss":625259430.0550152},"designations":[{"catalog":"ATNF","designation":"J1804-2717"},{"catalog":"ATNF","designation":"PSR J1804-2717"}],"updated_at":"2026-10-01T09:42:28.932Z","citation":{"plain":"SpaceCatalog. PSR J1804-2717 [catalogue entry]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/psr-j1804m2717","bibtex":"@misc{spacecatalog_psr-j1804m2717,\n  author       = {{SpaceCatalog}},\n  title        = {{PSR J1804-2717}},\n  howpublished = {SpaceCatalog, data release DR1 (2026-08-21)},\n  year         = {2026},\n  url          = {https://spacecatalog.org/object/psr-j1804m2717},\n  note         = {Catalogue entry, data release DR1 (2026-08-21). Values from ATNF Pulsar Catalogue (Manchester+ 2005).}\n}","url":"https://spacecatalog.org/object/psr-j1804m2717","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."}