{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.842","julian_year":2026.842,"time":"2026-11-04T08:35:53.197Z","years_from_j2000":26.842,"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-37387","name":"HD 37387","class":"k2ib_orange_supergiant","category":"star","object_type":"K2Ib orange supergiant","mag":7.52,"mag_band":"V","abs_mag":-2.973,"abs_mag_band":"V","distance_ly":4093.5927965587293,"distance_method":"parallax (Gaia DR3, zero point corrected)","ra_deg":84.811785,"dec_deg":23.32336,"epoch_ra_deg":85.222284,"epoch_dec_deg":23.338495,"epoch_moved_arcsec":0.177,"pm_ra_mas_yr":-0.78,"pm_dec_mas_yr":-6.54,"position_epoch_jyear":null,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Taurus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-37387","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":"05392+2317","companions":[{"measured":2015,"magnitude":11.08,"components":"CD","discoverer_code":"STF 755","separation_arcsec":78.6,"position_angle_deg":177}],"spectral_type":"K2Ib","uncertainties":{"distance_ly":[151.47256690709088,163.5781174972559],"metallicity_fe_h":[0.035,0.035]},"color_index_bv":1.924,"luminosity_solar":1346.968777801495,"metallicity_fe_h":0.095,"radial_velocity_km_s":6,"spectral_type_source":"SIMBAD (1968AJ.....73..588R, quality C)","surface_gravity_log_g":0.89,"surface_temperature_k":4369,"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":-0.78,"proper_motion_dec_mas_yr":-6.54,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"HD","designation":"HD 37387"},{"catalog":"HIP","designation":"HIP 26599"}],"updated_at":"2026-10-01T09:42:28.932Z","citation":{"plain":"SpaceCatalog. HD 37387 [catalogue entry]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/hd-37387","bibtex":"@misc{spacecatalog_hd-37387,\n  author       = {{SpaceCatalog}},\n  title        = {{HD 37387}},\n  howpublished = {SpaceCatalog, data release DR1 (2026-08-21)},\n  year         = {2026},\n  url          = {https://spacecatalog.org/object/hd-37387},\n  note         = {Catalogue entry, data release DR1 (2026-08-21). Values from HYG Database v4.1.}\n}","url":"https://spacecatalog.org/object/hd-37387","release":"DR1","doi":null},"references":[{"bibcode":"1968AJ.....73..588R","ads_url":"https://ui.adsabs.harvard.edu/abs/1968AJ.....73..588R/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."}