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1119 Euboea
	Shape model of Euboea from its lightcurve
Discovery
Discovered by	K. Reinmuth
Discovery site	Heidelberg Obs.
Discovery date	27 October 1927
Designations
MPC designation	(1119) Euboea
Pronunciation	/juːˈbiːə/
Named after	Euboea (Greek island)
Alternative designations	1927 UB
Minor planet category	main-belt · (middle); background;
Orbital characteristics
	Epoch 4 September 2017 (JD 2458000.5)
	Uncertainty parameter 0
Observation arc	90.10 yr (32,908 days)
Aphelion	3.0172 AU
Perihelion	2.2036 AU
Semi-major axis	2.6104 AU
Eccentricity	0.1558
Orbital period (sidereal)	4.22 yr (1,540 days)
Mean anomaly	190.40°
Mean motion	0° 14m 1.32s / day
Inclination	7.8583°
Longitude of ascending node	57.381°
Argument of perihelion	230.16°
Physical characteristics
Dimensions	18.37±4.84 km; 25.10±8.95 km; 29.443±0.279 km; 31.46 km (derived); 31.881±0.199 km; 31.90±0.38 km
Synodic rotation period	11.396±0.001 h; 11.3981±0.0005 h; 11.39823±0.00001 h; 11.41±0.01 h
Geometric albedo	0.0539 (derived); 0.0576±0.0081; 0.058±0.002; 0.09±0.06; 0.15±0.07; 0.213±0.044
Spectral type	S (assumed)
Absolute magnitude (H)	11.20 · 11.30 · 11.32

1119 Euboea (/juːˈbiːə/; prov. designation: 1927 UB) is a background asteroid from the central region of the asteroid belt. It was discovered on 27 October 1927, by German astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory in southwest Germany.^[3] The asteroid has a rotation period of 11.4 hours and measures approximately 30 kilometers (19 miles) in diameter. It was named for the Greek island of Euboea.^[2]

Orbit and classification

Euboea is a non-family asteroid of the main belt's background population when applying the hierarchical clustering method to its proper orbital elements.^[4]^[5] It orbits the Sun in the central asteroid belt at a distance of 2.2–3.0 AU once every 4 years and 3 months (1,540 days; semi-major axis of 2.61 AU). Its orbit has an eccentricity of 0.16 and an inclination of 8° with respect to the ecliptic.^[1] The body's observation arc begins with a recovered observation from the Lowell Observatory in April 1930, more than 2 years after to its official discovery observation.^[3]

Naming

This minor planet was named after Euboea, also known as "Negropont", the largest island of Greece in the Aegean Sea. The naming was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 105).^[2]

Physical characteristics

Euboea is an assumed stony S-type asteroid.^[9]

Rotation period and poles

In October 2007, a first rotational lightcurve of Euboea was obtained from photometric observations by astronomers at the Oakley Southern Sky Observatory in Australia. Lightcurve analysis gave a rotation period of 11.41 hours with a brightness variation of 0.50 magnitude (U=3).^[15] In April 2010, a similar period of 11.396 hours and an amplitude of 0.46 magnitude was measured by French amateur astronomer Pierre Antonini (U=3).^[12]

In 2016, two modeled lightcurves were published using photometric data from the Lowell Photometric Database and other sources. They gave a concurring sidereal period of 11.3981 and 11.39823 hours, respectively.^[13]^[14] Each study also determined two respective spin axes of (79.0°, 75.0°) and (282.0°, 55.0°),^[13] and (71.0°, 61.0°) and (280.0°, 54.0°)^[14] in ecliptic coordinates (λ, β).

Diameter and albedo

According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Euboea measures between 18.37 and 31.90 kilometers in diameter and its surface has an albedo between 0.0576 and 0.213.^[6]^[7]^[8]^[10]^[11] The Collaborative Asteroid Lightcurve Link derives a low albedo of 0.0539 – typical for carbonaceous C-type asteroids – and a diameter of 31.46 kilometers based on an absolute magnitude of 11.3.^[9]

References

^ ^a ^b ^c ^d ^e "JPL Small-Body Database Browser: 1119 Euboea (1927 UB)" (2017-12-01 last obs.). Jet Propulsion Laboratory. Retrieved 25 January 2018.
^ ^a ^b ^c Schmadel, Lutz D. (2007). "(1119) Euboea". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 95. doi:10.1007/978-3-540-29925-7_1120. ISBN 978-3-540-00238-3.
^ ^a ^b ^c "1119 Euboea (1927 UB)". Minor Planet Center. Retrieved 25 January 2018.
^ ^a ^b "Asteroid 1119 Euboea – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 28 October 2019.
^ ^a ^b "Asteroid 1119 Euboea". Small Bodies Data Ferret. Retrieved 13 March 2020.
^ ^a ^b ^c ^d Nugent, C. R.; Mainzer, A.; Bauer, J.; Cutri, R. M.; Kramer, E. A.; Grav, T.; et al. (September 2016). "NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos". The Astronomical Journal. 152 (3): 12. arXiv:1606.08923. Bibcode:2016AJ....152...63N. doi:10.3847/0004-6256/152/3/63.
^ ^a ^b ^c ^d Nugent, C. R.; Mainzer, A.; Masiero, J.; Bauer, J.; Cutri, R. M.; Grav, T.; et al. (December 2015). "NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos". The Astrophysical Journal. 814 (2): 13. arXiv:1509.02522. Bibcode:2015ApJ...814..117N. doi:10.1088/0004-637X/814/2/117. S2CID 9341381.
^ ^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. S2CID 119293330.
^ ^a ^b ^c ^d ^e ^f "LCDB Data for (1119) Euboea". Asteroid Lightcurve Database (LCDB). Retrieved 25 January 2018.
^ ^a ^b ^c ^d 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. S2CID 35447010.
^ ^a ^b ^c ^d 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. (online, AcuA catalog p. 153)
^ ^a ^b Behrend, Raoul. "Asteroids and comets rotation curves – (1119) Euboea". Geneva Observatory. Retrieved 25 January 2018.
^ ^a ^b ^c Hanuš, J.; Ďurech, J.; Oszkiewicz, D. A.; Behrend, R.; Carry, B.; Delbo, M.; et al. (February 2016). "New and updated convex shape models of asteroids based on optical data from a large collaboration network". Astronomy and Astrophysics. 586: A108. arXiv:1510.07422. Bibcode:2016A&A...586A.108H. doi:10.1051/0004-6361/201527441. ISSN 0004-6361. S2CID 119112278.
^ ^a ^b ^c Durech, J.; Hanus, J.; Oszkiewicz, D.; Vanco, R. (March 2016). "Asteroid models from the Lowell photometric database". Astronomy and Astrophysics. 587: 6. arXiv:1601.02909. Bibcode:2016A&A...587A..48D. doi:10.1051/0004-6361/201527573. S2CID 118427201.
^ ^a ^b Torno, Steven; Oliver, Robert Lemke; Ditteon, Richard (June 2008). "Asteroid Lightcurve Analysis at the Oakley Southern Sky Observatory - October 2007" (PDF). Minor Planet Bulletin. 35 (2): 54–55. Bibcode:2008MPBu...35...54T. ISSN 1052-8091.