{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.818","julian_year":2026.818,"time":"2026-10-26T20:16:22.983Z","years_from_j2000":26.818,"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":"hip-8819","name":"HIP 8819","class":"f5_yellow_white_star","category":"star","object_type":"F5 yellow-white star","mag":10.42,"mag_band":"V","abs_mag":2.427,"abs_mag_band":"V","distance_ly":1294.2713504999779,"distance_method":"parallax","ra_deg":28.344630000000002,"dec_deg":-28.366348,"epoch_ra_deg":28.652753,"epoch_dec_deg":-28.233199,"epoch_moved_arcsec":0.62,"pm_ra_mas_yr":10.72,"pm_dec_mas_yr":20.5,"position_epoch_jyear":null,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Fornax","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hip-8819","source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0","attribution":"HYG Database v4.1, Astronexus (github.com/astronexus/HYG-Database). 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":{"age_years":4395418000,"mass_solar":1.216,"radius_solar":1.553,"spectral_type":"F5","color_index_bv":0.56,"luminosity_solar":9.315367652385738,"radial_velocity_km_s":0,"surface_gravity_log_g":4.021,"surface_temperature_k":6044,"proper_motion_ra_mas_yr":10.72,"proper_motion_dec_mas_yr":20.5,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":2.9995},"designations":[{"catalog":"HIP","designation":"HIP 8819"}],"updated_at":"2026-10-01T09:42:28.932Z","citation":{"plain":"SpaceCatalog. HIP 8819 [catalogue entry]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/hip-8819","bibtex":"@misc{spacecatalog_hip-8819,\n  author       = {{SpaceCatalog}},\n  title        = {{HIP 8819}},\n  howpublished = {SpaceCatalog, data release DR1 (2026-08-21)},\n  year         = {2026},\n  url          = {https://spacecatalog.org/object/hip-8819},\n  note         = {Catalogue entry, data release DR1 (2026-08-21). Values from HYG Database v4.1.}\n}","url":"https://spacecatalog.org/object/hip-8819","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."}