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)
|{{{apsis}}}|helion}}| 2.9392 AU
|{{{apsis}}}|helion}}| 1.9165 AU

Semi-major axis

| 2.4279 AU
Eccentricity| 0.2106
Orbital period| 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°

|{{{apsis}}}|helion}}

| 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]

## Contents

* 1 Orbit and classification
* 2 Physical characteristics
* 2.1 Diameter and albedo
* 2.2 Lightcurves
* 3 Naming
* 4 References
* 5 External links

## Orbit and classification

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

### Diameter and albedo

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

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

## Naming

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

1. ↑ 1.0 1.1 1.2 1.3 1.4 "JPL Small-Body Database Browser: 7866 Sicoli (1982 TK)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2007866.
2. ↑ 2.0 2.1 2.2 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. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 "LCDB Data for (7866) Sicoli". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=7866|Sicoli.
4. ↑ 4.0 4.1 4.2 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. doi:10.1088/0004-637X/741/2/68. Bibcode: 2011ApJ...741...68M. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011ApJ...741...68M. Retrieved 4 November 2016.
5. ↑ 5.0 5.1 5.2 5.3 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. doi:10.1088/0004-637X/741/2/90. Bibcode: 2011ApJ...741...90M.
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. doi:10.1016/j.icarus.2015.08.007. Bibcode: 2015Icar..261...34V. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015Icar..261...34V. Retrieved 4 November 2016.
7. ↑ 7.0 7.1 "7866 Sicoli (1982 TK)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=7866.
8. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html.

## External links

* Asteroid Lightcurve Database (LCDB), query form (info )
* 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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