{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.809","julian_year":2026.809,"time":"2026-10-23T07:26:28.218Z","years_from_j2000":26.809,"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-185955","name":"HD 185955","class":"g9ii_iii_yellow_bright_giant","category":"star","object_type":"G9II-III yellow bright giant","mag":6.25,"mag_band":"V","abs_mag":0.741,"abs_mag_band":"V","distance_ly":412.33439430619455,"distance_method":"parallax","ra_deg":294.89389500000004,"dec_deg":45.957439,"epoch_ra_deg":295.097725,"epoch_dec_deg":46.019045,"epoch_moved_arcsec":0.723,"pm_ra_mas_yr":11.67,"pm_dec_mas_yr":24.31,"position_epoch_jyear":null,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Cygnus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-185955","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":557711060,"mass_solar":2.601,"radius_solar":10.83,"spectral_type":"G9II-III","uncertainties":{"metallicity_fe_h":[0.07,0.07]},"color_index_bv":0.931,"luminosity_solar":44.01492842868153,"metallicity_fe_h":0.11,"radial_velocity_km_s":-10,"spectral_type_source":"SIMBAD (quality D)","surface_gravity_log_g":2.571,"surface_temperature_k":4977,"metallicity_fe_h_source":"Median of 2 spectroscopic determinations in 2 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":11.67,"proper_motion_dec_mas_yr":24.31,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":64.636},"designations":[{"catalog":"HD","designation":"HD 185955"},{"catalog":"HIP","designation":"HIP 96706"},{"catalog":"HR","designation":"HR 7487"}],"updated_at":"2026-10-01T09:42:28.932Z","citation":{"plain":"SpaceCatalog. HD 185955 [catalogue entry]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/hd-185955","bibtex":"@misc{spacecatalog_hd-185955,\n  author       = {{SpaceCatalog}},\n  title        = {{HD 185955}},\n  howpublished = {SpaceCatalog, data release DR1 (2026-08-21)},\n  year         = {2026},\n  url          = {https://spacecatalog.org/object/hd-185955},\n  note         = {Catalogue entry, data release DR1 (2026-08-21). Values from HYG Database v4.1.}\n}","url":"https://spacecatalog.org/object/hd-185955","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."}