{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.679","julian_year":2026.679,"time":"2026-09-05T20:50:54.113Z","years_from_j2000":26.679,"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-99550","name":"HIP 99550","class":"m0vk_red_dwarf","category":"star","object_type":"M0Vk red dwarf","mag":11.3,"mag_band":"V","abs_mag":9.435,"abs_mag_band":"V","distance_ly":76.99638840034704,"distance_method":"parallax","ra_deg":303.03938999999997,"dec_deg":-12.893157,"epoch_ra_deg":303.413878,"epoch_dec_deg":-12.814551,"epoch_moved_arcsec":7.305,"pm_ra_mas_yr":195.17,"pm_dec_mas_yr":-192.07,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Capricornus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hip-99550","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"20124-1237","companions":[{"measured":2015,"magnitude":15.59,"components":"CD","discoverer_code":"RAO  88","separation_arcsec":18,"position_angle_deg":273}],"spectral_type":"M0Vk","color_index_bv":1.424,"luminosity_solar":0.014655478409559098,"variable_mag_max":11.179,"variable_mag_min":11.379,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (2006AJ....132..161G, quality C)","proper_motion_ra_mas_yr":195.17,"proper_motion_dec_mas_yr":-192.07},"designations":[{"catalog":"HIP","designation":"HIP 99550"}],"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."}