{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.845","julian_year":2026.845,"time":"2026-11-05T16:45:13.083Z","years_from_j2000":26.845,"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-109980","name":"9 CVn","class":"a6vp_lb_white_main_sequence_star","category":"star","object_type":"A6Vp_lB white main-sequence star","mag":6.35,"mag_band":"V","abs_mag":2.165,"abs_mag_band":"V","distance_ly":224.06272004688597,"distance_method":"parallax (Gaia DR3, zero point corrected)","ra_deg":189.69281599142312,"dec_deg":40.874662,"epoch_ra_deg":190.018189,"epoch_dec_deg":40.726073,"epoch_moved_arcsec":0.745,"pm_ra_mas_yr":-24.25,"pm_dec_mas_yr":-13.49,"position_epoch_jyear":null,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Canes Venatici","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-109980","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":725078340,"mass_solar":1.751,"radius_solar":1.789,"spectral_type":"A6Vp_lB","uncertainties":{"distance_ly":[0.3575471202623869,0.3586918823142862]},"color_index_bv":0.204,"luminosity_solar":11.85461508879175,"radial_velocity_km_s":-15,"spectral_type_source":"SIMBAD (1995ApJS...99..135A, quality C)","surface_gravity_log_g":4.091,"surface_temperature_k":7814,"proper_motion_ra_mas_yr":-24.25,"proper_motion_dec_mas_yr":-13.49,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4) — low confidence: above 7,500 K GSP-Phot's temperature and extinction are degenerate; Gaia's classifier calls the source a binary, which GSP-Phot fitted as one star","bolometric_luminosity_solar":11.5536},"designations":[{"catalog":"Bayer/Flamsteed","designation":"9 CVn"},{"catalog":"HD","designation":"HD 109980"},{"catalog":"HIP","designation":"HIP 61692"},{"catalog":"HR","designation":"HR 4811"}],"updated_at":"2026-11-04T19:31:31.075Z","citation":{"plain":"SpaceCatalog. 9 CVn [catalogue entry]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/hd-109980","bibtex":"@misc{spacecatalog_hd-109980,\n  author       = {{SpaceCatalog}},\n  title        = {{9 CVn}},\n  howpublished = {SpaceCatalog, data release DR1 (2026-08-21)},\n  year         = {2026},\n  url          = {https://spacecatalog.org/object/hd-109980},\n  note         = {Catalogue entry, data release DR1 (2026-08-21). Values from HYG Database v4.1.}\n}","url":"https://spacecatalog.org/object/hd-109980","release":"DR1","doi":null},"references":[{"bibcode":"1995ApJS...99..135A","ads_url":"https://ui.adsabs.harvard.edu/abs/1995ApJS...99..135A/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."}