1960 Guisan

1960 Guisan, provisional designation 1973 UA, is a carbonaceous asteroid from the middle region of the asteroid belt, approximately 25 kilometers in diameter.

1960 Guisan
Discovery [1]
Discovered byP. Wild
Discovery siteZimmerwald Obs.
Discovery date25 October 1973
Designations
(1960) Guisan
Named after
Henri Guisan (General)[2]
1973 UA · 1961 VC1
1969 UR2
main-belt · (middle) [3]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc61.49 yr (22,461 days)
Aphelion2.8352 AU
Perihelion2.2185 AU
2.5268 AU
Eccentricity0.1220
4.02 yr (1,467 days)
74.212°
0° 14m 43.44s / day
Inclination8.4737°
22.213°
263.99°
Physical characteristics
Dimensions24.55±1.2 km (IRAS:5)[4]
24.65±0.28 km[5]
27.004±0.176 km[6]
27.23±0.57 km[7]
28.411±0.105 km[8]
8.46 h[9]
0.0370±0.0050[8]
0.041±0.003[7][6]
0.049±0.011[5]
0.0496±0.005 (IRAS:5)[4]
C [3]
B–V = 0.720[1]
U–B = 0.290[1]
11.93[1][3][7][8][5][9] · 11.93 (IRAS:5)[4]

    It was discovered on 25 October 1973, by astronomer Paul Wild at Zimmerwald Observatory near Bern, Switzerland, and named after Swiss General Henri Guisan.[2][10]

    Orbit and classification

    Guisan orbits the Sun in the central main-belt at a distance of 2.2–2.8 AU once every 4.02 years (1,467 days). Its orbit has an eccentricity of 0.12 and an inclination of 8° with respect to the ecliptic.[1]

    Physical characteristics

    Guisan has been characterized as a dark C-type asteroid.[3]

    It has a rotation period of 8.46 hours[9] and a geometric albedo of 0.04–0.05, as measured by the IRAS, Akari, WISE and NEOWISE surveys.[4][5][7][8]

    Naming

    This minor planet was named in memory of Henri Guisan (1874–1960), general of the Swiss army during the Second World War. He was notably from the country's smaller Swiss-French part rather than from the German-speaking part.[2] The official naming citation was published by the Minor Planet Center on 18 April 1977 (M.P.C. 4157).[11]

    References
    1. "JPL Small-Body Database Browser: 1960 Guisan (1973 UA)" (2016-09-21 last obs.). Jet Propulsion Laboratory. Retrieved 10 June 2017.
    2. Schmadel, Lutz D. (2007). "(1960) Guisan". Dictionary of Minor Planet Names – (1960) Guisan. Springer Berlin Heidelberg. p. 158. doi:10.1007/978-3-540-29925-7_1961. ISBN 978-3-540-00238-3.
    3. "LCDB Data for (1960) Guisan". Asteroid Lightcurve Database (LCDB). Retrieved 8 December 2016.
    4. 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. Retrieved 17 October 2019.
    5. Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C.; et al. (November 2012). "Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids". The Astrophysical Journal Letters. 759 (1): 5. arXiv:1209.5794. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 8 December 2016.
    6. 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. Retrieved 8 December 2016.
    7. 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 17 October 2019. (online, AcuA catalog p. 153)
    8. 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.
    9. Binzel, R. P. (October 1987). "A photoelectric survey of 130 asteroids". Icarus. 72 (1): 135–208. Bibcode:1987Icar...72..135B. doi:10.1016/0019-1035(87)90125-4. ISSN 0019-1035. Retrieved 8 December 2016.
    10. "1960 Guisan (1973 UA)". Minor Planet Center. Retrieved 8 December 2016.
    11. Schmadel, Lutz D. (2009). "Appendix – Publication Dates of the MPCs". Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008). Springer Berlin Heidelberg. p. 221. doi:10.1007/978-3-642-01965-4. ISBN 978-3-642-01964-7.

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