16765 Agnesi

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16765 Agnesi
Discovery [1]
Discovered by P. G. Comba
Discovery site Prescott Obs.
Discovery date16 October 1996
Designations
(16765) Agnesi
Named after
 Maria Agnesi
(Italian mathematician) [2]
1996 UA
main-belt  · Eunomia [3]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 19.88 yr (7,261 days)
Aphelion 2.9139 AU
Perihelion 2.3361 AU
2.6250 AU
Eccentricity 0.1101
4.25 yr (1,553 days)
4.2373°
0° 13m 54.12s / day
Inclination 12.266°
17.764°
314.93°
Physical characteristics
Dimensions 3.84 km (calculated) [3]
4.132±0.247 km [4] [5]
7.5458±0.0034 h [6]
0.21 (assumed) [3]
0.2849±0.0250 [4]
0.285±0.025 [5]
S [3]
13.9 [1] [4]  ·13.30±0.00 [7]  ·13.943±0.004(R) [6]  ·14.39 [3]

    16765 Agnesi (provisional designation 1996 UA) is a stony Eunomia asteroid from the middle region of the asteroid belt, approximately 4 kilometers in diameter. It was discovered on 16 October 1996, by Italian-American amateur astronomer Paul Comba at his private Prescott Observatory in Arizona, United States. [8] The asteroid was named after Italian mathematician Maria Gaetana Agnesi. [2]

    Contents

    Orbit and classification

    Agnesi is a member of the Eunomia family, a large group of S-type asteroids and the most prominent family in the central main-belt. It orbits the Sun at a distance of 2.3–2.9  AU once every 4 years and 3 months (1,553 days). Its orbit has an eccentricity of 0.11 and an inclination of 12° with respect to the ecliptic. [1] It was first observed by Haleakala–NEAT/GEODSS ( 566 ), extending the asteroid's observation arc by 32 days prior to its official discovery observation. [8]

    Physical characteristics

    Diameter and albedo

    According to the NEOWISE mission of NASA's space-based Wide-field Infrared Survey Explorer, Agnesi measures 4.1 kilometers in diameter and its surface has an albedo of 0.28, [4] while the Collaborative Asteroid Lightcurve Link assumes an albedo of 0.21 – derived from 15 Eunomia, the family's largest member and namesake – and calculates a diameter of 3.8 kilometers. [3]

    Lightcurves

    A rotational lightcurve of Agnesi was obtained from photometric observations taken by astronomers at the Palomar Transient Factory in September 2013. Lightcurve analysis gave a rotation period of 7.5458 hours with a brightness variation of 0.31 magnitude ( U=2 ). [6]

    Naming

    This minor planet was named in honor of Italian Maria Gaetana Agnesi (1718–1799), who was the first Western woman to write a widely translated mathematics handbook and the first woman appointed to a professorship at a university in 1750. [2] The official naming citation was published by the Minor Planet Center on 9 January 2001 ( M.P.C. 41941). [9]

    References

    1. 1 2 3 4 "JPL Small-Body Database Browser: 16765 Agnesi (1996 UA)" (2016-08-01 last obs.). Jet Propulsion Laboratory. Archived from the original on 20 August 2020. Retrieved 26 June 2017.
    2. 1 2 3 Schmadel, Lutz D. (2007). "(16765) Agnesi". Dictionary of Minor Planet Names – (16765) Agnesi. Springer Berlin Heidelberg. p. 840. doi:10.1007/978-3-540-29925-7_9340. ISBN   978-3-540-00238-3.
    3. 1 2 3 4 5 6 "LCDB Data for (16765) Agnesi". Asteroid Lightcurve Database (LCDB). Retrieved 2 May 2016.
    4. 1 2 3 4 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 . Retrieved 2 May 2016.
    5. 1 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. arXiv: 1109.4096 . Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68 . Retrieved 3 December 2016.
    6. 1 2 3 Waszczak, Adam; Chang, Chan-Kao; Ofek, Eran O.; Laher, Russ; Masci, Frank; Levitan, David; et al. (September 2015). "Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry". The Astronomical Journal. 150 (3): 35. arXiv: 1504.04041 . Bibcode:2015AJ....150...75W. doi:10.1088/0004-6256/150/3/75 . Retrieved 2 May 2016.
    7. ↑ 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 2 May 2016.
    8. 1 2 "16765 Agnesi (1996 UA)". Minor Planet Center. Retrieved 2 May 2016.
    9. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 2 May 2016.
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