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773 Irmintraud
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<p>773 Irmintraud, provisional designation 1913 TV, is a dark and reddish, rare-type <a href="/facts/Asteroid/g7Ulr1VB">asteroid</a> from the outer region of the <a href="/facts/Asteroid_belt/YHAq2Eh3">asteroid belt</a>, about 92 kilometers in diameter. It was discovered on 22 December 1913, by German astronomer <a href="/facts/Franz_Kaiser/lyQK9W8J">Franz Kaiser</a> at <a href="/facts/Heidelberg-K%C3%B6nigstuhl_State_Observatory/qWqouk0k">Heidelberg Observatory</a> in southern Germany. </p><p>The asteroid is classified as a <a href="/facts/D-type_asteroid/qQ6b4lq4">D-type</a> and <a href="/facts/T-type_asteroid/Nf7uAYN7">T-type</a> body in the <a href="/facts/Tholen_classification/WoSTAYnh">Tholen</a> and <a href="/facts/SMASS_classification/WoSTAYnh">SMASS</a> taxonomy, respectively. The rare spectral T-type is similar to D-types which are often found among <a href="/facts/Jupiter_trojan/KN9dgpUr">Jupiter trojans</a> thought to have originated from the <a href="/facts/Kuiper_belt/IvLzYp5P">Kuiper belt</a>. It orbits the Sun at a distance of 2.6–3.1 <a href="/facts/Astronomical_unit/gjsbu5xU">AU</a> once every 4 years and 10 months (1,763 days). Its orbit is <a href="/facts/Orbital_inclination/TQCFWyfd">tilted</a> by 17 degrees to the plane of the <a href="/facts/Ecliptic/cJxXDDDW">ecliptic</a> and shows a low <a href="/facts/Orbital_eccentricity/WGlB4NBn">eccentricity</a> of 0.08. According to the surveys carried out by the Infrared Astronomical Satellite, <a href="/facts/IRAS/MaYMxytq">IRAS</a>, the Japanese <a href="/facts/Akari_(satellite)/3sL3D4Ev">Akari</a> satellite, and the <a href="/facts/Wide-field_Infrared_Survey_Explorer/7st7krr6">Wide-field Infrared Survey Explorer</a> with its subsequent <a href="/facts/NEOWISE/7st7krr6">NEOWISE</a> mission, the minor planet's low <a href="/facts/Astronomical_albedo/TJDRdKEB">albedo</a> lies in the range of 0.04–0.05. It has a well-defined <a href="/facts/Rotation_period/vHcCt6cu">rotation period</a> of 6.75 hours, determined by several concurring observations. </p><p>773 Irmintraud commemorates the antiquated German feminine name, Irmtraud, that appears frequently in old songs and <a href="/facts/Sagas/49wawMXk">sagas</a>. The asteroid is a likely source of the <a href="/facts/Tagish_Lake_(meteorite)/Jj60jJ6k">Tagish Lake meteorite</a> which landed in Canada on January 18, 2000. </p>