2091 Sampo, provisional designation 1941 HO, is a stony Eos asteroid and relatively slow rotator from the outer region of the asteroid belt, approximately 30 kilometers in diameter. It was discovered on 26 April 1941, by Finnish astronomer Yrjö Väisälä at Turku Observatory, Finland, and named after Sampo from Finnish mythology.
Orbit and classification
Sampo is a member of the Eos family ( ), the largest 606 asteroid family in the outer main belt consisting of nearly 10,000 asteroids.   : It orbits the Sun in at a distance of 2.8–3.2 23 AU once every 5 years and 3 months (1,911 days). Its orbit has an eccentricity of 0.06 and an inclination of 11 ° with respect to the ecliptic.
S-type asteroid measures between 23.0 and 35.5 kilometers in diameter, and its surface has an albedo between 0.118 and 0.277, according to the surveys carried out by IRAS, Akari, and NEOWISE.   
lightcurve of Sampo was obtained from photometric observations made by astronomers René Roy, Laurent Bernasconi and Stéphane Charbonnelat in March 2003. It gave a potentially long rotation period of hours with a brightness variation of 0.38 71.34 ±0.05 magnitude ( ). U=2
minor planet was named after the wonder-object Sampo from Finnish mythology. It is mentioned in the national oral folklore and mythology epic, Kalevala, after which the minor planet 1454 Kalevala is named. Sampo was to produce every kind of fortune. When Kalevala and Pohjola (also see were fighting for its possession it broke into pieces. 3606 Pohjola) The official naming citation was published by the  Minor Planet Center on 1 August 1980 ( ). M.P.C. 5450
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"JPL Small-Body Database Browser: 2091 Sampo (1941 HO)" (2017-02-17 last obs.). Jet Propulsion Laboratory . Retrieved . 11 June 2017
^ a b
Schmadel, Lutz D. (2007). "(2091) Sampo". Dictionary of Minor Planet Names – (2091) Sampo. Springer Berlin Heidelberg. pp. 169–170. doi: 10.1007/978-3-540-29925-7_2092. ISBN . 978-3-540-00238-3
^ a b c d e
"LCDB Data for (2091) Sampo". Asteroid Lightcurve Database (LCDB) . Retrieved . 7 December 2016
^ a b
"Small Bodies Data Ferret". Nesvorny HCM Asteroid Families V3.0 . Retrieved . 21 November 2017
^ a b c
Masiero, Joseph R.; Grav, T.; Mainzer, A. K.; Nugent, C. R.; Bauer, J. M.; Stevenson, R.; et al. (August 2014). "Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos". The Astrophysical Journal. 791 (2): 11. arXiv: . 1406.6645 Bibcode: 2014ApJ...791..121M. doi: 10.1088/0004-637X/791/2/121.
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Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal. 741 (2): 25. arXiv: . 1109.6407 Bibcode: 2011ApJ...741...90M. doi: 10.1088/0004-637X/741/2/90.
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Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System: IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode: 2004PDSS...12.....T. Archived from the original on 2016-06-03 . Retrieved . 7 December 2016
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Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode: 2011PASJ...63.1117U. doi: 10.1093/pasj/63.5.1117 . Retrieved . 7 December 2016 Online catalog
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Behrend, Raoul. "Asteroids and comets rotation curves – (2091) Sampo". Geneva Observatory . Retrieved . 7 December 2016
"2091 Sampo (1941 HO)". Minor Planet Center . Retrieved . 7 December 2016
Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). Identification and Dynamical Properties of Asteroid Families. Asteroids IV. pp. 297–321. arXiv: . 1502.01628 Bibcode: 2015aste.book..297N. doi: 10.2458/azu_uapress_9780816532131-ch016. ISBN . 9780816532131
"MPC/MPO/MPS Archive". Minor Planet Center . Retrieved . 7 December 2016