{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.833","julian_year":2026.833,"time":"2026-11-01T09:55:08.258Z","years_from_j2000":26.833,"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-112311","name":"HD 112311 A","class":"f0iv_yellow_white_subgiant","category":"star","object_type":"F0IV yellow-white subgiant","mag":8.57,"mag_band":"V","abs_mag":4.402,"abs_mag_band":"V","distance_ly":222.3287349035285,"distance_method":"parallax","ra_deg":193.74831,"dec_deg":58.160321,"epoch_ra_deg":194.039445,"epoch_dec_deg":58.01355,"epoch_moved_arcsec":1.351,"pm_ra_mas_yr":-7.84,"pm_dec_mas_yr":-49.72,"position_epoch_jyear":null,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Ursa Major","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-112311","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":"12550+5810","companions":[{"measured":2017,"magnitude":9.8,"components":"AB","discoverer_code":"STF1691","separation_arcsec":18.5,"position_angle_deg":275},{"measured":2015,"magnitude":9.61,"components":"AC","discoverer_code":"STF1691","separation_arcsec":130.3,"position_angle_deg":84}],"spectral_type":"F0IV","color_index_bv":0.375,"luminosity_solar":1.510775731924994,"variable_mag_max":8.444,"variable_mag_min":8.664,"radial_velocity_km_s":-12,"spectral_type_source":"SIMBAD (quality C)","surface_temperature_k":6762,"proper_motion_ra_mas_yr":-7.84,"proper_motion_dec_mas_yr":-49.72,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"HIP","designation":"HIP 63034"}],"updated_at":"2026-10-01T09:42:28.932Z","citation":{"plain":"SpaceCatalog. HD 112311 A [catalogue entry]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/hd-112311","bibtex":"@misc{spacecatalog_hd-112311,\n  author       = {{SpaceCatalog}},\n  title        = {{HD 112311 A}},\n  howpublished = {SpaceCatalog, data release DR1 (2026-08-21)},\n  year         = {2026},\n  url          = {https://spacecatalog.org/object/hd-112311},\n  note         = {Catalogue entry, data release DR1 (2026-08-21). Values from HYG Database v4.1.}\n}","url":"https://spacecatalog.org/object/hd-112311","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."}