{"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":"2026-10-27T02:32:38.221Z","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":"hip-56600","name":"HIP 56600","class":"m0_red_star","category":"star","object_type":"M0 red star","mag":10.26,"mag_band":"V","abs_mag":2.572,"abs_mag_band":"V","distance_ly":1124.6772095275812,"distance_method":"parallax","ra_deg":174.06828,"dec_deg":-25.617122,"epoch_ra_deg":174.405549,"epoch_dec_deg":-25.766357,"epoch_moved_arcsec":0.214,"pm_ra_mas_yr":-3.85,"pm_dec_mas_yr":-6.98,"position_epoch_jyear":null,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Hydra","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hip-56600","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":292194250,"mass_solar":3.306,"radius_solar":26.998,"spectral_type":"M0","color_index_bv":1.683,"luminosity_solar":8.150795556116012,"variable_mag_max":10.205,"variable_mag_min":10.315,"radial_velocity_km_s":0,"surface_gravity_log_g":1.636,"surface_temperature_k":4302,"proper_motion_ra_mas_yr":-3.85,"proper_motion_dec_mas_yr":-6.98,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":183.1247},"designations":[{"catalog":"HIP","designation":"HIP 56600"}],"updated_at":"2026-10-01T09:42:28.932Z","citation":{"plain":"SpaceCatalog. HIP 56600 [catalogue entry]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/hip-56600","bibtex":"@misc{spacecatalog_hip-56600,\n  author       = {{SpaceCatalog}},\n  title        = {{HIP 56600}},\n  howpublished = {SpaceCatalog, data release DR1 (2026-08-21)},\n  year         = {2026},\n  url          = {https://spacecatalog.org/object/hip-56600},\n  note         = {Catalogue entry, data release DR1 (2026-08-21). Values from HYG Database v4.1.}\n}","url":"https://spacecatalog.org/object/hip-56600","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."}