120 Lachesis

Main-belt asteroid October 2012 yes #D6D6D6 120 Lachesis Alphonse Borrelly 10 April 1872 (120) Lachesis 000120-asteroid shape model (120) Lachesis.png 3D convex shape model of 120 Lachesis A872 GB; 1910 CF;1918 UB ˈ l æ k ᵻ s ɪ s LAK iss isshttp://www.lexico.com/definition/Lachesis https://web.archive.org/web/20200323121500/https://www.lexico.com/definition/lachesis dead March 23, 2020 Lachesis Lexico UK English Dictionary Oxford University Press Lachesian (l æ ˈ k iː ʃ ( i ) ə n ,_ l ə ˈ k iː ʒ ə n la KEE sh(ee )ən ,_ lə KEE zhən) Lachesis Main belt 31 July 2016 (JD 2457600.5) 3.11767 AU Gm on 2.95390 AU Gm on 3.2814 AU Gm on on 0.052528 5.50 yr (2010.7 d) 6.9643° 341.193° 232.822° 56.2095° 16.86 km/s 155.132 1.133 km (IRAS) 4.27 0.36 18 kgCalculated from its standard gravitational parameter GM = 0.285 0.024 km3 s2. 2.18 g/cm3 0.0487 m/s2 0.0920 km/s 46.551 h d on on C 7.75 0.0463 0.002 ~158 K 0.179044 ms / day 143.70 yr (52485 d) 0 1.95464 AU Gm on 1.72275 AU Gm on 3.204 120 Lachesis is a large main-belt asteroid. It was discovered by French astronomer Alphonse Borrelly on April 10, 1872, and independently by German-American astronomer Christian Heinrich Friedrich Peters on April 11, 1872, then named after Lachesis, one of the Moirai, or Fates, in Greek mythology. A Lachesean occultation of a star occurred in 1999 and was confirmed visually by five observers and once photoelectrically, with the chords yielding an estimated elliptical cross-section of 184 × 144 km. This body is orbiting the Sun with a period of 5.50 years and an eccentricity (ovalness) of 0.05. The orbital plane is inclined by 7° to the plane of the ecliptic. Photometric observations of this asteroid were made in early 2009 at the Organ Mesa Observatory in Las Cruces, New Mexico. The resulting light curve shows a synodic rotation period of 46.551 ± 0.002 hours with a brightness variation of 0.14 ± 0.02 in magnitude. It is a very slow rotator with the longest rotation period of an asteroid more than 150 km in diameter. As a primitive C-type asteroid it is probably composed of carbonaceous material. Notes References JPL Small-Body Database Browser: 120 Lachesis https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=120 Jet Propulsion Laboratory 18 Dec 2022 120 Lachesis - a very slow rotator Bembrick Colin Allen Bill Bulletin of the Minor Planets Section of the Association of Lunar and Planetary Observers 32 3 45–46 September 2005 2005MPBu...32...45B JPL Small-Body Database Search Engine: diameter > 150 (km) and rot_per > 24 (h) JPL Solar System Dynamics https://ssd.jpl.nasa.gov/sbdb_query.cgi?obj_group=all;obj_kind=all;obj_numbered=all;OBJ_field=0;ORB_field=0;combine_mode=AND;c1_group=OBJ;c1_item=Ap;c1_op=%3E;c1_value=150;c2_group=OBJ;c2_item=As;c2_op=%3E;c2_value=24;table_format=HTML;max_rows=50;format_option=comp;c_fields=AcBhBgBjBiBnBsAiApAs;.cgifields=format_option;.cgifields=ast_orbit_class;.cgifields=combine_mode;.cgifields=table_format;.cgifields=obj_kind;.cgifields=obj_group;.cgifields=obj_numbered;.cgifields=com_orbit_class&query=1&c_sort=AsD 2015-06-06 Lutz D. Schmadel Dictionary of Minor Planet Names Springer 26 1 5th 2003 3540002383 https://books.google.com/books?id=VoJ5nUyIzCsC&pg=PA26 . Dunham D. W. Goffin E. Manek J. Federspiel M. Stone R. Owen W. 1 Asteroidal occultation results multiply helped by Hipparcos The Minor Planet Bulletin 73 3 662 September 2002 2002MmSAI..73..662D . Frederick Pilcher Rotation Period Determinations for 120 Lachesis, 131 Vala 157 Dejanira, and 271 Penthesilea The Minor Planet Bulletin 36 3 100–102 July 2009 2009MPBu...36..100P . Tedesco E. F. Williams J. G. Matson D. L. Weeder G. J. Gradie J. C. Lebofsky L. A. 1 A three-parameter asteroid taxonomy Astronomical Journal 97 580–606 February 1989 10.1086/115007 1989AJ.....97..580T . Fuentes-Muñoz Oscar Farnocchia Davide Giorgini Jon D. Park Ryan S. 2025-12-01 Asteroid Mass Estimation by Mutual Perturbations During Close Encounters After Gaia Focused Product Release The Astronomical Journal 170 6 353 10.3847/1538-3881/ae0cc9 0004-6256 free 2025AJ....170..353F 283347135 External links 120 119 Althaea 120 121 Hermione 000120 Category:Discoveries by Alphonse Borrelly Category:Named minor planets 000120 000120 18720410