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27270 Guidotti, provisional designation 2000 AY4, is a carbonaceous background asteroid from the inner regions of the asteroid belt, approximately 7 kilometers in diameter. It was discovered on 2 January 2000, by Italian astronomers Luciano Tesi and Alfredo Caronia at the Pistoia Mountains Astronomical Observatory in San Marcello Pistoiese, Italy.[8] The asteroid was named after amateur astronomer Guido Guidotti.[2]

27270 Guidotti
Discovery [1]
Discovered byL. Tesi
A. Caronia
Discovery siteSan Marcello Obs.
Discovery date2 January 2000
MPC designation(27270) Guidotti
Named after
Guido Guidotti[2]
(Italian amateur astronomer)
2000 AY4 · 1995 YH24
1998 SS103
main-belt · (inner)[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc25.95 yr (9,479 days)
Aphelion2.6014 AU
Perihelion2.2912 AU
2.4463 AU
3.83 yr (1,398 days)
0° 15m 27.36s / day
Physical characteristics
Mean diameter
3.74 km (calculated)[3]
6.9 km (est. at 0.06)[5]
2.6 h[6]
0.20 (assumed)[3]
C[7] · C (SDSS-MFB)[3]
14.46±0.28[7] · 14.5[1][3]

Orbit and classificationEdit

Guidotti is a non-family from the main belt's background population.[4] It orbits the Sun in the inner asteroid belt at a distance of 2.3–2.6 AU once every 3 years and 10 months (1,398 days). Its orbit has an eccentricity of 0.06 and an inclination of 3° with respect to the ecliptic.[1]

The body's observation arc begins with a precovery from the Digitized Sky Survey taken at Palomar Observatory in October 1991, more than 8 years prior to its official discovery observation at San Marcello in 2000.[8]

Physical characteristicsEdit

Guidotti has been characterized as a carbonaceous C-type asteroid by Pan-STARRS photometric survey,[7] as well as by SDSS-MFB (Masi Foglia Bus).[3]

Rotation periodEdit

In March 2008, a rotational lightcurve of Guidotti was obtained from photometric observations by Slovak astronomers Adrian Galad and Leonard Kornoš. Analysis of the fragmentary lightcurve gave a rotation period of 2.6 hours with a brightness amplitude of 0.3 magnitude (U=1).[6] As of 2017, no secure period has been obtained.[3]

Diameter and albedoEdit

Guidotti has not been observed by any of the spaced-based surveys such as the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, the Japanese Akari satellite or the Infrared Astronomical Satellite.

The Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 3.74 kilometers based on an absolute magnitude of 14.5.[3] Based on a generic magnitude-to diameter conversion, using a typical albedo for carbonaceous asteroids of 0.06, Guidotti measures 6.9 kilometers in diameter.[5]


This minor planet was named after Guido Guidotti (born 1946), an Italian amateur astronomer and founder of the Association of Astronomy "A. Pieri" (Italian: Associazione Astrofili Valdinievole "A. Pieri"), in Valdinievole, Tuscany, Italy. He is an observer of asteroids and comets, and organizer of lectures and exhibitions on astronomical subjects.[2] The official naming citation was published by the Minor Planet Center on 26 November 2004 (M.P.C. 53176).[9]


  1. ^ a b c d "JPL Small-Body Database Browser: 27270 Guidotti (2000 AY4)" (2017-09-30 last obs.). Jet Propulsion Laboratory. Retrieved 1 November 2017.
  2. ^ a b c Schmadel, Lutz D. (2006). "(27270) Guidotti [2.45, 0.06, 2.8]". Dictionary of Minor Planet Names – (27270) Guidotti, Addendum to Fifth Edition: 2003–2005. Springer Berlin Heidelberg. p. 191. doi:10.1007/978-3-540-34361-5_2245. ISBN 978-3-540-34361-5.
  3. ^ a b c d e f g h "LCDB Data for (27270) Guidotti". Asteroid Lightcurve Database (LCDB). Retrieved 1 November 2017.
  4. ^ a b "Asteroid 27270 Guidotti – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 29 October 2019.
  5. ^ a b "Asteroid Size Estimator". CNEOS – NASA/JPL. Retrieved 1 November 2017.
  6. ^ a b Galad, Adrian; Kornos, Leonard (October 2008). "A Collection of Lightcurves from Modra: 2007 December- 2008 June". The Minor Planet Bulletin. 35 (4): 144–146. Bibcode:2008MPBu...35..144G. ISSN 1052-8091. Retrieved 1 November 2017.
  7. ^ a b c Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results". Icarus. 261: 34–47. arXiv:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 1 November 2017.
  8. ^ a b "27270 Guidotti (2000 AY4)". Minor Planet Center. Retrieved 1 November 2017.
  9. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 1 November 2017.

External linksEdit