{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.855","julian_year":2026.855,"time":"2026-11-09T05:24:33.513Z","years_from_j2000":26.855,"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-63303","name":"HIP 63303","class":"m1_5v_red_dwarf","category":"star","object_type":"M1.5V red dwarf","mag":11.83,"mag_band":"V","abs_mag":8.621,"abs_mag_band":"V","distance_ly":142.9882606165312,"distance_method":"parallax","ra_deg":194.59021754239077,"dec_deg":40.556379,"epoch_ra_deg":194.907484,"epoch_dec_deg":40.40937,"epoch_moved_arcsec":6.99,"pm_ra_mas_yr":218,"pm_dec_mas_yr":-142.2,"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/hip-63303","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":"12584+4033","companions":[{"measured":2010,"magnitude":13.7,"components":null,"discoverer_code":"HDS1819","separation_arcsec":0.2,"position_angle_deg":195}],"spectral_type":"M1.5V","uncertainties":{"distance_ly":[22.457516514621084,32.74247828047665]},"color_index_bv":1,"luminosity_solar":0.031017014994776864,"variable_mag_max":11.624,"variable_mag_min":11.954,"spectral_type_source":"SIMBAD (2013AJ....145..102L, quality C)","proper_motion_ra_mas_yr":218,"proper_motion_dec_mas_yr":-142.2},"designations":[{"catalog":"HIP","designation":"HIP 63303"}],"updated_at":"2026-11-04T19:31:31.075Z","citation":{"plain":"SpaceCatalog. HIP 63303 [catalogue entry]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/hip-63303","bibtex":"@misc{spacecatalog_hip-63303,\n  author       = {{SpaceCatalog}},\n  title        = {{HIP 63303}},\n  howpublished = {SpaceCatalog, data release DR1 (2026-08-21)},\n  year         = {2026},\n  url          = {https://spacecatalog.org/object/hip-63303},\n  note         = {Catalogue entry, data release DR1 (2026-08-21). Values from HYG Database v4.1.}\n}","url":"https://spacecatalog.org/object/hip-63303","release":"DR1","doi":null},"references":[{"bibcode":"2013AJ....145..102L","ads_url":"https://ui.adsabs.harvard.edu/abs/2013AJ....145..102L/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."}