{"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":"2026-10-26T16:33:04.663Z","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":"hd-219734","name":"8 And","class":"m2_5iiiba0_5_red_giant","category":"star","object_type":"M2.5IIIBa0.5 red giant","mag":4.82,"mag_band":"V","abs_mag":-1.367,"abs_mag_band":"V","distance_ly":563.309898456631,"distance_method":"parallax","ra_deg":349.43598000000003,"dec_deg":49.0153,"epoch_ra_deg":349.748179,"epoch_dec_deg":49.16264,"epoch_moved_arcsec":0.942,"pm_ra_mas_yr":34.48,"pm_dec_mas_yr":6.74,"position_epoch_jyear":null,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Andromeda","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-219734","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":"23177+4901","companions":[{"measured":2016,"magnitude":13,"components":"AB","discoverer_code":"BU  717","separation_arcsec":7.8,"position_angle_deg":163},{"measured":2015,"magnitude":16,"components":"AF","discoverer_code":"KUI 116","separation_arcsec":14.7,"position_angle_deg":181},{"measured":2007,"magnitude":12.46,"components":"AD","discoverer_code":"FOX 273","separation_arcsec":58.6,"position_angle_deg":233},{"measured":2015,"magnitude":12.34,"components":"AE","discoverer_code":"WAL 147","separation_arcsec":94.1,"position_angle_deg":108},{"measured":2008,"magnitude":10.83,"components":"AC","discoverer_code":"BU  717","separation_arcsec":217.3,"position_angle_deg":131}],"radius_solar":97.62,"spectral_type":"M2.5IIIBa0.5","color_index_bv":1.668,"luminosity_solar":306.7608976917938,"radial_velocity_km_s":-8,"spectral_type_source":"SIMBAD (1989ApJS...71..245K, quality B)","surface_gravity_log_g":1.252,"surface_temperature_k":5159,"proper_motion_ra_mas_yr":34.48,"proper_motion_dec_mas_yr":6.74,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)"},"designations":[{"catalog":"Bayer/Flamsteed","designation":"8 And"},{"catalog":"HD","designation":"HD 219734"},{"catalog":"HIP","designation":"HIP 115022"},{"catalog":"HR","designation":"HR 8860"}],"updated_at":"2026-10-01T09:42:28.932Z","citation":{"plain":"SpaceCatalog. 8 And [catalogue entry]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/hd-219734","bibtex":"@misc{spacecatalog_hd-219734,\n  author       = {{SpaceCatalog}},\n  title        = {{8 And}},\n  howpublished = {SpaceCatalog, data release DR1 (2026-08-21)},\n  year         = {2026},\n  url          = {https://spacecatalog.org/object/hd-219734},\n  note         = {Catalogue entry, data release DR1 (2026-08-21). Values from HYG Database v4.1.}\n}","url":"https://spacecatalog.org/object/hd-219734","release":"DR1","doi":null},"references":[{"bibcode":"1989ApJS...71..245K","ads_url":"https://ui.adsabs.harvard.edu/abs/1989ApJS...71..245K/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."}