{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.818","julian_year":2026.818,"time":"2026-10-26T16:13:21.840Z","years_from_j2000":26.818,"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-104888","name":"HIP 104888","class":"f8_yellow_white_star","category":"star","object_type":"F8: yellow-white star","mag":12.32,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":null,"distance_method":null,"ra_deg":318.701955,"dec_deg":11.008393,"epoch_ra_deg":319.027419,"epoch_dec_deg":11.117294,"epoch_moved_arcsec":10.071,"pm_ra_mas_yr":-63.46,"pm_dec_mas_yr":-370.15,"position_epoch_jyear":null,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Equuleus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hip-104888","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":{"radius_solar":0.715,"spectral_type":"F8:","uncertainties":{"metallicity_fe_h":[0.395,0.395]},"color_index_bv":0.549,"metallicity_fe_h":-1.935,"variable_mag_max":12.099,"variable_mag_min":12.539,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1994A&A...291..895A, quality D)","surface_gravity_log_g":4.576,"surface_temperature_k":5787,"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":-63.46,"proper_motion_dec_mas_yr":-370.15,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":0.4827},"designations":[{"catalog":"HIP","designation":"HIP 104888"}],"updated_at":"2026-10-01T09:42:28.932Z","citation":{"plain":"SpaceCatalog. HIP 104888 [catalogue entry]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/hip-104888","bibtex":"@misc{spacecatalog_hip-104888,\n  author       = {{SpaceCatalog}},\n  title        = {{HIP 104888}},\n  howpublished = {SpaceCatalog, data release DR1 (2026-08-21)},\n  year         = {2026},\n  url          = {https://spacecatalog.org/object/hip-104888},\n  note         = {Catalogue entry, data release DR1 (2026-08-21). Values from HYG Database v4.1.}\n}","url":"https://spacecatalog.org/object/hip-104888","release":"DR1","doi":null},"references":[{"bibcode":"1994A&A...291..895A","ads_url":"https://ui.adsabs.harvard.edu/abs/1994A%26A...291..895A/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."}