7866 Sicoli

7866 SicoliDiscovery [1]

Discovered by| E. Bowell
Discovery site| Anderson Mesa Stn.
Discovery date| 13 October 1982
Designations

MPC designation

| (7866) Sicoli

Named after

| Piero Sicoli
(discoverer of minor planets)[2]

Alternative designations

| 1982 TK * 1954 CT
1959 OD

Minor planet category

| main-belt * Nysa [3]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc| 63.01 yr (23,016 days)
Aphelion| 2.9392 AU
Perihelion| 1.9165 AU

Semi-major axis

| 2.4279 AU
Eccentricity| 0.2106

Orbital period (sidereal)

| 3.78 yr (1,382 days)

Mean anomaly

| 112.12°

Mean motion

| 0° 15m 37.8s / day
Inclination| 3.4801°

Longitude of ascending node

| 77.978°

Argument of perihelion

| 253.20°
Physical characteristics
Dimensions| 5.604±0.199 km[4][5]
6.34 km (calculated)[3]

Geometric albedo

| 0.21 (assumed)[3]
0.2455±0.0504[5]
0.246±0.050[4]

Spectral type

| S [3]

Absolute magnitude (H)

| 13.28±0.28[6] * 13.3[1][3] * 13.4[5]

7866 Sicoli, provisional designation 1982 TK, is a stony Nysa asteroid from the inner regions of the asteroid belt, approximately 6 kilometers in diameter. It was discovered on 13 October 1982, by American astronomer Edward Bowell at Lowell's Anderson Mesa Station near Flagstaff, Arizona.[7] The asteroid was named after Italian astronomer Piero Sicoli.[2]

## Orbit and classification[edit]

Sicoli is a member of the stony subgroup of the Nysa family, one of the smaller families in the main-belt, named after its namesake, 44 Nysa. The body orbits the Sun in the inner main-belt at a distance of 1.9–2.9 AU once every 3 years and 9 months (1,382 days). Its orbit has an eccentricity of 0.21 and an inclination of 3° with respect to the ecliptic.[1] The first precovery was taken at Palomar Mountain in 1954, extending the asteroid's observation arc by 28 years prior to its discovery.[7]

## Physical characteristics[edit]

### Diameter and albedo[edit]

According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Sicoli measures 6.3 kilometers in diameter and its surface has an albedo of 0.246,[4][5] while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.21 and calculates a diameter of 5.6 kilometers, based on an absolute magnitude of 13.3.[3]

### Lightcurves[edit]

As of 2016, no rotational lightcurve has been obtained for this asteroid and its rotation period and shape remain unknown.[1][3]

## Naming[edit]

This minor planet was named in honor of Italian astronomer Piero Sicoli (born 1954), a discoverer of minor planets and Observation Coordinator at the Sormano Astronomical Observatory in northern Italy.[2] The official naming citation was published by the Minor Planet Center on 28 July 1999 (M.P.C. 35488).[8]

## References[edit]

1. ^ a b c d e "JPL Small-Body Database Browser: 7866 Sicoli (1982 TK)" (2017-02-15 last obs.). Jet Propulsion Laboratory. Archived from the original on 5 March 2017. Retrieved 22 June 2017.
2. ^ a b c Schmadel, Lutz D. (2007). "(7866) Sicoli". Dictionary of Minor Planet Names – (7866) Sicoli. Springer Berlin Heidelberg. p. 620\. doi:10.1007/978-3-540-29925-7_6718. ISBN 978-3-540-00238-3.
3. ^ a b c d e f g "LCDB Data for (7866) Sicoli". Asteroid Lightcurve Database (LCDB). Retrieved 4 November 2016.
4. ^ a b c Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Dailey, J.; et al. (November 2011). "Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters". The Astrophysical Journal. 741 (2): 20. arXiv:1109.4096. Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68. Retrieved 4 November 2016.
5. ^ 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.
6. ^ 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 4 November 2016.
7. ^ a b "7866 Sicoli (1982 TK)". Minor Planet Center. Retrieved 4 November 2016.
8. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 4 November 2016.

## External links[edit]

* Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
* Dictionary of Minor Planet Names, Google books
* Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
* Discovery Circumstances: Numbered Minor Planets (5001)-(10000) – Minor Planet Center
* 7866 Sicoli at AstDyS-2, Asteroids—Dynamic Site
* Ephemeris * Observation prediction * Orbital info * Proper elements * Observational info
* 7866 Sicoli at the JPL Small-Body Database
* Close approach * Discovery * Ephemeris * Orbit diagram * Orbital elements * Physical parameters

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