{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.844","julian_year":2026.844,"time":"2026-11-05T10:31:34.240Z","years_from_j2000":26.844,"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-78715","name":"79 Cnc","class":"g5iii_yellow_giant","category":"star","object_type":"G5III yellow giant","mag":6.04,"mag_band":"V","abs_mag":0.777,"abs_mag_band":"V","distance_ly":368.1222665248014,"distance_method":"parallax","ra_deg":137.58691566785808,"dec_deg":21.996415,"epoch_ra_deg":137.974285,"epoch_dec_deg":21.886543,"epoch_moved_arcsec":0.152,"pm_ra_mas_yr":3.5,"pm_dec_mas_yr":4.44,"position_epoch_jyear":null,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Cancer","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-78715","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":"09103+2200","age_years":622056100,"companions":[{"measured":1940,"magnitude":null,"components":null,"discoverer_code":"WRH  17","separation_arcsec":0.1,"position_angle_deg":107}],"mass_solar":2.501,"radius_solar":10.1,"spectral_type":"G5III","uncertainties":{"distance_ly":[16.66070856048983,18.318883346131013],"metallicity_fe_h":[0.05,0.05]},"color_index_bv":0.89,"luminosity_solar":42.57944535825967,"metallicity_fe_h":-0.03,"radial_velocity_km_s":-7,"spectral_type_source":"SIMBAD (quality C)","surface_gravity_log_g":2.304,"surface_temperature_k":4989,"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":3.5,"proper_motion_dec_mas_yr":4.44,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":56.9469},"designations":[{"catalog":"Bayer/Flamsteed","designation":"79 Cnc"},{"catalog":"HD","designation":"HD 78715"},{"catalog":"HIP","designation":"HIP 45033"},{"catalog":"HR","designation":"HR 3640"}],"updated_at":"2026-11-04T19:31:31.075Z","citation":{"plain":"SpaceCatalog. 79 Cnc [catalogue entry]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/hd-78715","bibtex":"@misc{spacecatalog_hd-78715,\n  author       = {{SpaceCatalog}},\n  title        = {{79 Cnc}},\n  howpublished = {SpaceCatalog, data release DR1 (2026-08-21)},\n  year         = {2026},\n  url          = {https://spacecatalog.org/object/hd-78715},\n  note         = {Catalogue entry, data release DR1 (2026-08-21). Values from HYG Database v4.1.}\n}","url":"https://spacecatalog.org/object/hd-78715","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."}