{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.822","julian_year":2026.822,"time":"2026-10-28T05:38:10.348Z","years_from_j2000":26.822,"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":"ngc-2841","name":"NGC 2841","class":"barred_spiral_galaxy_sbb","category":"galaxy","object_type":"Barred spiral galaxy SBb","mag":10.18,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":34560643.452541634,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":140.51095833333335,"dec_deg":50.97652777777778,"epoch_ra_deg":140.975666,"epoch_dec_deg":50.861596,"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":"Ursa Major","discovered":"1788","featured":false,"url":"https://spacecatalog.org/object/ngc-2841","source":{"id":"openngc","name":"OpenNGC","url":"https://github.com/mattiaverga/OpenNGC","license":"CC-BY-SA-4.0","attribution":"OpenNGC, Mattia Verga (github.com/mattiaverga/OpenNGC). Fields derived from it stay under CC BY-SA 4.0.","commercial_use":"allowed"},"radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":10.06,"h_mag":6.3,"j_mag":7.01,"k_mag":6.06,"v_mag":10.18,"redshift":0.0019,"hubble_type":"SBb","wikidata_id":"Q580345","redshift_cmb":0.0024695391336237993,"discovered_by":"William Herschel","ngc_type_code":"G","uncertainties":{"distance_ly":[14073502.842114357,14073502.842114357]},"major_axis_arcmin":6.9,"minor_axis_arcmin":3.31,"wikipedia_article":"NGC 2841","position_angle_deg":147,"surface_brightness":22.48,"radial_velocity_km_s":569},"designations":[{"catalog":"2MASX","designation":"2MASX J09220265+5058353"},{"catalog":"IRAS","designation":"IRAS 09185+5111"},{"catalog":"IRAS","designation":"IRAS F09186+5111"},{"catalog":"LEDA","designation":"LEDA 26512"},{"catalog":"MCG","designation":"MCG +09-16-005"},{"catalog":"NGC","designation":"NGC 2841"},{"catalog":"PGC","designation":"PGC 26512"},{"catalog":"SDSS","designation":"SDSS J092202.66+505835.7"},{"catalog":"UGC","designation":"UGC 4966"}],"updated_at":"2026-10-01T09:42:28.932Z","citation":{"plain":"SpaceCatalog. NGC 2841 [catalogue entry]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/ngc-2841","bibtex":"@misc{spacecatalog_ngc-2841,\n  author       = {{SpaceCatalog}},\n  title        = {{NGC 2841}},\n  howpublished = {SpaceCatalog, data release DR1 (2026-08-21)},\n  year         = {2026},\n  url          = {https://spacecatalog.org/object/ngc-2841},\n  note         = {Catalogue entry, data release DR1 (2026-08-21). Values from OpenNGC.}\n}","url":"https://spacecatalog.org/object/ngc-2841","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."}