{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.824","julian_year":2026.824,"time":"2026-10-29T01:45:20.921Z","years_from_j2000":26.824,"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-16399","name":"HIP 16399","class":"f8_yellow_white_star","category":"star","object_type":"F8 yellow-white star","mag":8.77,"mag_band":"V","abs_mag":4.551,"abs_mag_band":"V","distance_ly":227.60398815671905,"distance_method":"parallax","ra_deg":52.78926,"dec_deg":13.575851,"epoch_ra_deg":53.163734,"epoch_dec_deg":13.6672,"epoch_moved_arcsec":2.872,"pm_ra_mas_yr":4.91,"pm_dec_mas_yr":-106.95,"position_epoch_jyear":null,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Taurus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hip-16399","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":{"wds_id":"03312+1335","age_years":2594465700,"companions":[{"measured":2024,"magnitude":17.9,"components":"AB","discoverer_code":"GWP 475","separation_arcsec":78.2,"position_angle_deg":155}],"mass_solar":1.166,"radius_solar":1.234,"spectral_type":"F8","color_index_bv":0.504,"luminosity_solar":1.3170431381998406,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (quality D)","surface_gravity_log_g":4.297,"surface_temperature_k":6230,"proper_motion_ra_mas_yr":4.91,"proper_motion_dec_mas_yr":-106.95,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4) — low confidence: Gaia's classifier calls the source a binary, which GSP-Phot fitted as one star","bolometric_luminosity_solar":2.0557},"designations":[{"catalog":"HIP","designation":"HIP 16399"}],"updated_at":"2026-10-01T09:42:28.932Z","citation":{"plain":"SpaceCatalog. HIP 16399 [catalogue entry]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/hip-16399","bibtex":"@misc{spacecatalog_hip-16399,\n  author       = {{SpaceCatalog}},\n  title        = {{HIP 16399}},\n  howpublished = {SpaceCatalog, data release DR1 (2026-08-21)},\n  year         = {2026},\n  url          = {https://spacecatalog.org/object/hip-16399},\n  note         = {Catalogue entry, data release DR1 (2026-08-21). Values from HYG Database v4.1.}\n}","url":"https://spacecatalog.org/object/hip-16399","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."}