{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.819","julian_year":2026.819,"time":"2026-10-27T05:18:11.311Z","years_from_j2000":26.819,"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-8491","name":"36 ψ Cas","class":"k0iii_iiibcn0_5_orange_giant","category":"star","object_type":"K0III-IIIbCN0.5 orange giant","mag":4.72,"mag_band":"V","abs_mag":0.836,"abs_mag_band":"V","distance_ly":195.0695633230962,"distance_method":"parallax","ra_deg":21.48312,"dec_deg":68.130012,"epoch_ra_deg":21.964159,"epoch_dec_deg":68.270509,"epoch_moved_arcsec":2.138,"pm_ra_mas_yr":75.07,"pm_dec_mas_yr":26.82,"position_epoch_jyear":null,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Cassiopeia","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-8491","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":"01259+6808","companions":[{"measured":2021,"magnitude":14,"components":"AB","discoverer_code":"BU 1101","separation_arcsec":3.3,"position_angle_deg":26},{"measured":2021,"magnitude":10,"components":"AD","discoverer_code":"BU 1101","separation_arcsec":18.7,"position_angle_deg":134},{"measured":2020,"magnitude":9.18,"components":"AC","discoverer_code":"H 5  83","separation_arcsec":20.3,"position_angle_deg":127}],"spectral_type":"K0III-IIIbCN0.5","color_index_bv":1.047,"luminosity_solar":40.3273792976113,"metallicity_fe_h":-0.13,"radial_velocity_km_s":-12,"spectral_type_source":"SIMBAD (1989ApJS...71..245K, quality B)","surface_gravity_log_g":2.74,"surface_temperature_k":4700,"metallicity_fe_h_source":"One spectroscopic determination, compiled from the literature (PASTEL, Soubiran+ 2016)","proper_motion_ra_mas_yr":75.07,"proper_motion_dec_mas_yr":26.82,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"Bayer/Flamsteed","designation":"36 Psi Cas"},{"catalog":"HD","designation":"HD 8491"},{"catalog":"HIP","designation":"HIP 6692"},{"catalog":"HR","designation":"HR 399"}],"updated_at":"2026-10-01T09:42:28.932Z","citation":{"plain":"SpaceCatalog. 36 ψ Cas [catalogue entry]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/hd-8491","bibtex":"@misc{spacecatalog_hd-8491,\n  author       = {{SpaceCatalog}},\n  title        = {{36 ψ Cas}},\n  howpublished = {SpaceCatalog, data release DR1 (2026-08-21)},\n  year         = {2026},\n  url          = {https://spacecatalog.org/object/hd-8491},\n  note         = {Catalogue entry, data release DR1 (2026-08-21). Values from HYG Database v4.1.}\n}","url":"https://spacecatalog.org/object/hd-8491","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."}