{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.813","julian_year":2026.813,"time":"2026-10-24T23:43:58.756Z","years_from_j2000":26.813,"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-j1901m0125","name":"PSR J1901-0125","class":"millisecond_pulsar","category":"neutron_star","object_type":"Millisecond pulsar","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":7700.552077892312,"distance_method":"dispersion measure through the YMW16 electron-density model","ra_deg":285.3908333333333,"dec_deg":-1.4247222222222222,"epoch_ra_deg":285.739926,"epoch_dec_deg":-1.386577,"epoch_moved_arcsec":0.078,"pm_ra_mas_yr":-1.9,"pm_dec_mas_yr":-5,"position_epoch_jyear":2012.1984941820672,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Aquila","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/psr-j1901m0125","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":"GRS:4FGL_J1901.4-0126[aab+22]","spin_period_s":0.0027933649560078376,"uncertainties":{"proper_motion_ra_mas_yr":[0.9,0.9],"proper_motion_dec_mas_yr":[3,3]},"position_epoch_jyear":2012.1984941820672,"spin_period_derivative":3.576063468406558e-20,"proper_motion_ra_mas_yr":-1.9,"characteristic_age_years":1237623364.4148533,"proper_motion_dec_mas_yr":-5,"dispersion_measure_pc_cm3":70.42,"spin_down_luminosity_erg_s":6.477119557601497e+34,"surface_magnetic_field_gauss":319827959.72305614},"designations":[{"catalog":"ATNF","designation":"J1901-0125"},{"catalog":"ATNF","designation":"PSR J1901-0125"}],"updated_at":"2026-10-01T09:42:28.932Z","citation":{"plain":"SpaceCatalog. PSR J1901-0125 [catalogue entry]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/psr-j1901m0125","bibtex":"@misc{spacecatalog_psr-j1901m0125,\n  author       = {{SpaceCatalog}},\n  title        = {{PSR J1901-0125}},\n  howpublished = {SpaceCatalog, data release DR1 (2026-08-21)},\n  year         = {2026},\n  url          = {https://spacecatalog.org/object/psr-j1901m0125},\n  note         = {Catalogue entry, data release DR1 (2026-08-21). Values from ATNF Pulsar Catalogue (Manchester+ 2005).}\n}","url":"https://spacecatalog.org/object/psr-j1901m0125","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."}