{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.848","julian_year":2026.848,"time":"2026-11-06T14:30:06.796Z","years_from_j2000":26.848,"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":"hd-208906","name":"HD 208906","class":"g0vmf2_yellow_main_sequence_star","category":"star","object_type":"G0VmF2 yellow main-sequence star","mag":6.95,"mag_band":"V","abs_mag":4.622,"abs_mag_band":"V","distance_ly":95.30306476975888,"distance_method":"parallax (Gaia DR3, zero point corrected)","ra_deg":329.6701358810857,"dec_deg":29.81263,"epoch_ra_deg":329.968574,"epoch_dec_deg":29.938645,"epoch_moved_arcsec":14.209,"pm_ra_mas_yr":-361.74,"pm_dec_mas_yr":-386.3,"position_epoch_jyear":null,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Pegasus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-208906","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":"21587+2949","companions":[{"measured":1997,"magnitude":13.3,"components":null,"discoverer_code":"BUP 231","separation_arcsec":55.4,"position_angle_deg":76}],"mass_solar":1.126,"radius_solar":1.005,"spectral_type":"G0VmF2","uncertainties":{"distance_ly":[0.06297613034331509,0.06305946955981662],"metallicity_fe_h":[0.082,0.082]},"color_index_bv":0.501,"luminosity_solar":1.2341330519073677,"metallicity_fe_h":-0.72,"radial_velocity_km_s":8.4,"spectral_type_source":"SIMBAD (2001AJ....121.2148G, quality C)","surface_gravity_log_g":4.374,"surface_temperature_k":6101,"metallicity_fe_h_source":"Median of 13 spectroscopic determinations in 14 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":-361.74,"proper_motion_dec_mas_yr":-386.3,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":1.2601},"designations":[{"catalog":"HD","designation":"HD 208906"},{"catalog":"HIP","designation":"HIP 108490"}],"updated_at":"2026-11-04T19:31:31.075Z","citation":{"plain":"SpaceCatalog. HD 208906 [catalogue entry]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/hd-208906","bibtex":"@misc{spacecatalog_hd-208906,\n  author       = {{SpaceCatalog}},\n  title        = {{HD 208906}},\n  howpublished = {SpaceCatalog, data release DR1 (2026-08-21)},\n  year         = {2026},\n  url          = {https://spacecatalog.org/object/hd-208906},\n  note         = {Catalogue entry, data release DR1 (2026-08-21). Values from HYG Database v4.1.}\n}","url":"https://spacecatalog.org/object/hd-208906","release":"DR1","doi":null},"references":[{"bibcode":"2001AJ....121.2148G","ads_url":"https://ui.adsabs.harvard.edu/abs/2001AJ....121.2148G/abstract","quantity":"properties.spectral_type_source"}],"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."}