{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.677","julian_year":2026.677,"time":"2026-09-05T10:39:07.277Z","years_from_j2000":26.677,"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-18180","name":"HIP 18180","class":"m2_5v_red_dwarf","category":"star","object_type":"M2.5V red dwarf","mag":12.13,"mag_band":"V","abs_mag":10.085,"abs_mag_band":"V","distance_ly":83.65128313127948,"distance_method":"parallax","ra_deg":58.33233,"dec_deg":-37.06642,"epoch_ra_deg":58.577437,"epoch_dec_deg":-36.994274,"epoch_moved_arcsec":30.928,"pm_ra_mas_yr":-408.8,"pm_dec_mas_yr":-1084.85,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Eridanus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hip-18180","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"spectral_type":"M2.5V","color_index_bv":1.45,"luminosity_solar":0.008053784411990653,"variable_mag_max":11.952,"variable_mag_min":12.242,"radial_velocity_km_s":-67,"spectral_type_source":"SIMBAD (2006AJ....132..161G, quality C)","proper_motion_ra_mas_yr":-408.8,"proper_motion_dec_mas_yr":-1084.85},"designations":[{"catalog":"Gliese","designation":"Gl 155.3"},{"catalog":"HIP","designation":"HIP 18180"}],"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."}