{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.810","julian_year":2026.81,"time":"2026-10-23T22:52:54.795Z","years_from_j2000":26.81,"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":"sdss-j1030-0524","name":"SDSS J1030+0524","class":"quasar","category":"black_hole","object_type":"Quasar","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":196189907607.74628,"distance_method":"luminosity distance from a published redshift, flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":157.61288,"dec_deg":5.41528,"epoch_ra_deg":157.963908,"epoch_dec_deg":5.277127,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"position_epoch_jyear":null,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Sextans","discovered":"2001","featured":false,"url":"https://spacecatalog.org/object/sdss-j1030-0524","source":{"id":"curated","name":"SpaceCatalog curated data","url":"https://spacecatalog.org/releases","license":"CC-BY-4.0","attribution":null,"commercial_use":"allowed"},"radius_km":null,"radius_kind":null,"data_quality":null,"description":"One of the first quasars found beyond redshift six, and the one whose spectrum showed a complete absorption trough on the blue side of its hydrogen line. That trough is neutral gas between the galaxies blocking the light, and finding it was the first sight of the era before reionisation.","properties":{"redshift":6.308,"accretion":"quasar"},"designations":[{"catalog":"Common name","designation":"SDSS J1030+0524"}],"updated_at":"2026-10-01T09:42:28.932Z","citation":{"plain":"SpaceCatalog. SDSS J1030+0524 [catalogue entry]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/sdss-j1030-0524","bibtex":"@misc{spacecatalog_sdss-j1030-0524,\n  author       = {{SpaceCatalog}},\n  title        = {{SDSS J1030+0524}},\n  howpublished = {SpaceCatalog, data release DR1 (2026-08-21)},\n  year         = {2026},\n  url          = {https://spacecatalog.org/object/sdss-j1030-0524},\n  note         = {Catalogue entry, data release DR1 (2026-08-21). Values from SpaceCatalog curated data.}\n}","url":"https://spacecatalog.org/object/sdss-j1030-0524","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."}