{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.854","julian_year":2026.854,"time":"2026-11-08T20:07:06.572Z","years_from_j2000":26.854,"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-72280","name":"HIP 72280","class":"k7_orange_star","category":"star","object_type":"K7 orange star","mag":8.63,"mag_band":"V","abs_mag":-1.772,"abs_mag_band":"V","distance_ly":3925.06983901786,"distance_method":"parallax (Gaia DR3, zero point corrected)","ra_deg":221.7177590072591,"dec_deg":-22.473048,"epoch_ra_deg":222.104808,"epoch_dec_deg":-22.586337,"epoch_moved_arcsec":0.137,"pm_ra_mas_yr":-4.97,"pm_dec_mas_yr":1.14,"position_epoch_jyear":null,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Libra","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hip-72280","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":{"mass_solar":5.408,"radius_solar":77.678,"spectral_type":"K7","uncertainties":{"distance_ly":[142.5228555189278,153.68364106929326]},"color_index_bv":1.716,"luminosity_solar":445.4951975999945,"spectral_type_source":"SIMBAD (quality D)","surface_temperature_k":4618,"proper_motion_ra_mas_yr":-4.97,"proper_motion_dec_mas_yr":1.14,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4) — low confidence: Gaia's temperature, radius and luminosity do not agree with one another","bolometric_luminosity_solar":1334.6434},"designations":[{"catalog":"HIP","designation":"HIP 72280"}],"updated_at":"2026-11-04T21:40:42.974Z","citation":{"plain":"SpaceCatalog. HIP 72280 [catalogue entry]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/hip-72280","bibtex":"@misc{spacecatalog_hip-72280,\n  author       = {{SpaceCatalog}},\n  title        = {{HIP 72280}},\n  howpublished = {SpaceCatalog, data release DR1 (2026-08-21)},\n  year         = {2026},\n  url          = {https://spacecatalog.org/object/hip-72280},\n  note         = {Catalogue entry, data release DR1 (2026-08-21). Values from HYG Database v4.1.}\n}","url":"https://spacecatalog.org/object/hip-72280","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."}