{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.673","julian_year":2026.673,"time":"2026-09-03T17:06:49.631Z","years_from_j2000":26.673,"frame":"date","applied":"Proper motion, then precession and nutation. The catalogued J2000 position is carried along the great circle the object's own published motion puts it on, at a constant velocity, 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. 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-3678","name":"HIP 3678","class":"pg1159","category":"star","object_type":"PG1159","mag":11.77,"mag_band":"V","abs_mag":3.402,"abs_mag_band":"V","distance_ly":1538.473436718702,"distance_method":"parallax","ra_deg":11.763914999999999,"dec_deg":-11.871923,"epoch_ra_deg":12.10181,"epoch_dec_deg":-11.725203,"epoch_moved_arcsec":0.625,"pm_ra_mas_yr":-23.31,"pm_dec_mas_yr":-2.53,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Cetus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hip-3678","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"00470-1152","companions":[{"measured":2007,"magnitude":19,"components":"AC","discoverer_code":"ADA   1","separation_arcsec":1.1,"position_angle_deg":53},{"measured":2018,"magnitude":14.39,"components":"AB","discoverer_code":"CUD   1","separation_arcsec":3.9,"position_angle_deg":130}],"spectral_type":"PG1159","color_index_bv":-0.296,"luminosity_solar":3.7948970620763474,"variable_mag_max":11.692,"variable_mag_min":11.852,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1988A&A...198..287M, quality D)","proper_motion_ra_mas_yr":-23.31,"proper_motion_dec_mas_yr":-2.53},"designations":[],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-09-02T19:50:56.720Z","attribution":"Data from SpaceCatalog.org. Individual records carry their source and license in `source`; attribution is required for CC-BY and CC-BY-SA rows."}