{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.682","julian_year":2026.682,"time":"2026-09-07T05:23:03.418Z","years_from_j2000":26.682,"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":"hd-172088","name":"HD 172088","class":"f8v_yellow_white_main_sequence_star","category":"star","object_type":"F8V yellow-white main-sequence star","mag":6.49,"mag_band":"V","abs_mag":3.086,"abs_mag_band":"V","distance_ly":156.4298172549936,"distance_method":"parallax","ra_deg":279.59916,"dec_deg":-3.19364,"epoch_ra_deg":279.951666,"epoch_dec_deg":-3.17026,"epoch_moved_arcsec":0.913,"pm_ra_mas_yr":6.47,"pm_dec_mas_yr":33.59,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Serpens","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-172088","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"18384-0312","companions":[{"measured":2025,"magnitude":7.51,"components":"AB","discoverer_code":"A    88","separation_arcsec":0.1,"position_angle_deg":283},{"measured":1998,"magnitude":14,"components":"AB,C","discoverer_code":"A    88","separation_arcsec":18.5,"position_angle_deg":115}],"spectral_type":"F8V","color_index_bv":0.553,"luminosity_solar":5.076916258882489,"radial_velocity_km_s":-21,"spectral_type_source":"SIMBAD (1999MSS...C05....0H, quality C)","surface_temperature_k":6106,"proper_motion_ra_mas_yr":6.47,"proper_motion_dec_mas_yr":33.59,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"HD","designation":"HD 172088"},{"catalog":"HIP","designation":"HIP 91394"},{"catalog":"HR","designation":"HR 6999"}],"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."}