63 Ausonia

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63 Ausonia
63Ausonia (Lightcurve Inversion).png
Lightcurve-based 3D-model of Ausonia
Discovery [1][2]
Discovered by A. de Gasparis
Discovery site Capodimonte Obs.
Discovery date 10 February 1861
MPC designation (63) Ausonia
Pronunciation /ɔːˈsniə/
Named after
(ancient name for Italy)
1947 NA · 1948 WT
main-belt · (inner)
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 156.34 yr (57,104 days)
Aphelion 2.6993 AU
Perihelion 2.0910 AU
2.3951 AU
Eccentricity 0.1270
3.71 yr (1,354 days)
0° 15m 57.24s / day
Inclination 5.7763°
Physical characteristics
Mean diameter
87.47±1.13 km[6]
90 km (derived)[4]
90±18 km[7]
94.45±7.15 km[8]
102.975±2.754 km[9]
103.14±2.4 km[10]
104.71±23.82 km[11]
116.044±1.747 km[12]
Mass (1.53±0.15)×1018 kg[8]
Mean density
3.46±0.86 g/cm3[8]
9.282±0.003 h[13]
9.29 h[14]
9.293±0.001 h[15]
9.294 h[16]
9.29757 h[17]
9.29758 h[18]
9.29759 h[7][19]
9.29766 h[20]
9.298 h[21]
9.299 h[22]
0.2082 (derived)[4]
Tholen = S[1]
SMASS = Sa[1]
B–V = 0.916[1]
U–B = 0.500[1]

63 Ausonia (/ɔːˈsniə/ aw-SOH-nee-ə) is a stony Vestian asteroid from the inner region of the asteroid belt, approximately 100 kilometers (60 miles) in diameter. It was discovered by Italian astronomer Annibale de Gasparis on 10 February 1861, from the Astronomical Observatory of Capodimonte, in Naples, Italy. The asteroid was named Ausonia, after the ancient classical name for the Italian region.[3]

Orbit and classification[edit]

Ausonia is a member of the Vesta family.[4][5] Vestian asteroids have a composition akin to cumulate eucrites (HED meteorites) and are thought to have originated deep within 4 Vesta's crust, possibly from the Rheasilvia crater, a large impact crater on its southern hemisphere near the South pole, formed as a result of a subcatastrophic collision. Vesta is the main belt's second-largest and second-most-massive body after Ceres.[24][25]

It orbits the Sun in the inner asteroid belt at a distance of 2.1–2.7 AU once every 3 years and 9 months (1,354 days; semi-major axis of 2.40 AU). Its orbit has an eccentricity of 0.13 and an inclination of 6° with respect to the ecliptic.[1]

Physical characteristics[edit]

Ausonia was in a study using the Hubble FGS. Other studied asteroids included 15 Eunomia, 43 Ariadne, 44 Nysa, and 624 Hektor.[26]

Spectral type[edit]

In the Tholen classification, Ausonia is a stony S-type asteroid, while in the SMASS classification, it is an Sa-subtype, that transitions from the S-type to the uncommon A-type asteroid.[1] The body's stony composition has also been confirmed by polarimetric observations in 2017.[23]


In 1976, Ausonia was the subject of a photometric study by the Observatory of Turin in Italy.[21] A lighcurve of Ausonia was obtained with the ESO 0.5-metre telescope at La Silla Observatory in 1980.[27]

Diameter and albedo[edit]

According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Ausonia measures between 87.47 and 116.044 kilometers in diameter and its surface has an albedo between 0.125 and 0.25.[6][7][9][10][11][12] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.2082 and a diameter of 90 kilometers based on an absolute magnitude of 7.55.[4]

Binary status[edit]

Based on its lightcurve, a small moon had been suggested but never confirmed.[28]


The initial choice of name for the asteroid was "Italia", after Italy, but this was modified to Ausonia, an ancient classical name for the Italian region.[3]


  1. ^ a b c d e f g h i "JPL Small-Body Database Browser: 63 Ausonia" (2017-07-05 last obs.). Jet Propulsion Laboratory. Retrieved 3 February 2018. 
  2. ^ "63 Ausonia". Minor Planet Center. Retrieved 3 February 2018. 
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  4. ^ a b c d e f g "LCDB Data for (63) Ausonia". Asteroid Lightcurve Database (LCDB). Retrieved 3 February 2018. 
  5. ^ a b "Small Bodies Data Ferret". Nesvorny HCM Asteroid Families V3.0. Retrieved 3 February 2018. 
  6. ^ a b c d 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 3 February 2018. 
  7. ^ a b c Durech, Josef; Kaasalainen, Mikko; Herald, David; Dunham, David; Timerson, Brad; Hanus, Josef; et al. (August 2011). "Combining asteroid models derived by lightcurve inversion with asteroidal occultation silhouettes" (PDF). Icarus. 214 (2): 652–670. arXiv:1104.4227Freely accessible. Bibcode:2011Icar..214..652D. doi:10.1016/j.icarus.2011.03.016. Retrieved 3 February 2018. 
  8. ^ a b c Carry, B. (December 2012), "Density of asteroids" (PDF), Planetary and Space Science, 73, pp. 98–118, arXiv:1203.4336Freely accessible, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009  See Table 1.
  9. ^ 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" (PDF). The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407Freely accessible. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 3 February 2018. 
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  11. ^ a b c d Nugent, C. R.; Mainzer, A.; Masiero, J.; Bauer, J.; Cutri, R. M.; Grav, T.; et al. (December 2015). "NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos". The Astrophysical Journal. 814 (2): 13. arXiv:1509.02522Freely accessible. Bibcode:2015ApJ...814..117N. doi:10.1088/0004-637X/814/2/117. Retrieved 3 February 2018. 
  12. ^ a b c d 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:1209.5794Freely accessible. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 3 February 2018. 
  13. ^ Riccioli, D.; Blanco, C.; Cigna, M. (June 2001). "Rotational periods of asteroids II". Planetary and Space Science. 49 (7): 657–671. Bibcode:2001P&SS...49..657R. doi:10.1016/S0032-0633(01)00014-9. Retrieved 3 February 2018. 
  14. ^ Lagerkvist, C.-I.; Magnusson, P.; Williams, I. P.; Buontempo, M. E.; Gibbs, P.; Morrison, L. V. (June 1989). "Physical studies of asteroids. XIX - Phase relations and composite lightcurves obtained with the Carlsberg Meridian Circle". Astronomy and Astrophysics Supplement Series: 519–532. Bibcode:1989A&AS...78..519L. ISSN 0365-0138. Retrieved 3 February 2018. 
  15. ^ Behrend, Raoul. "Asteroids and comets rotation curves – (63) Ausonia". Geneva Observatory. Retrieved 3 February 2018. 
  16. ^ Lupishko, D. F.; Velichko, F. P. (February 1987). "The sense of rotation of asteroids 21, 63, 216, and 349". Kinematika i Fizika Nebesnykh Tel: 57–65.InRussian. Bibcode:1987KFNT....3...57L. ISSN 0233-7665. Retrieved 3 February 2018. 
  17. ^ Magnusson, P. (October 1986). "Distribution of spin axes and senses of rotation for 20 large asteroids". Icarus: 1–39. Bibcode:1986Icar...68....1M. doi:10.1016/0019-1035(86)90072-2. ISSN 0019-1035. Retrieved 3 February 2018. 
  18. ^ De Angelis, G. (May 1995). "Asteroid spin, pole and shape determinations". Planetary and Space Science. 43 (5): 649–682. Bibcode:1995P&SS...43..649D. doi:10.1016/0032-0633(94)00151-G. Retrieved 3 February 2018. 
  19. ^ Torppa, Johanna; Kaasalainen, Mikko; Michalowski, Tadeusz; Kwiatkowski, Tomasz; Kryszczynska, Agnieszka; Denchev, Peter; et al. (August 2003). "Shapes and rotational properties of thirty asteroids from photometric data". Icarus. 164 (2): 346–383. Bibcode:2003Icar..164..346T. doi:10.1016/S0019-1035(03)00146-5. Retrieved 3 February 2018. 
  20. ^ Michalowski, Tadeusz (October 1996). "Pole and Shape Determination for 12 Asteroids". Icarus. 123 (2): 456–462. Bibcode:1996Icar..123..456M. doi:10.1006/icar.1996.0171. Retrieved 3 February 2018. 
  21. ^ a b Scaltriti, F.; Zappala, V. (August 1977). "A photometric study of the minor planet 63 Ausonia". Icarus: 498–502. Bibcode:1977Icar...31..498S. doi:10.1016/0019-1035(77)90151-8. Retrieved 3 February 2018. 
  22. ^ Hainaut-Rouelle, M.-C.; Hainaut, O. R.; Detal, A. (July 1995). "Lightcurves of selected minor planets". Astronomy and Astrophysics Supplement: 125. Bibcode:1995A&AS..112..125H. Retrieved 3 February 2018. 
  23. ^ a b Belskaya, I. N.; Fornasier, S.; Tozzi, G. P.; Gil-Hutton, R.; Cellino, A.; Antonyuk, K.; et al. (March 2017). "Refining the asteroid taxonomy by polarimetric observations". Icarus. 284: 30–42. Bibcode:2017Icar..284...30B. doi:10.1016/j.icarus.2016.11.003. Retrieved 27 September 2017. 
  24. ^ Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). "Identification and Dynamical Properties of Asteroid Families" (PDF). Asteroids IV: 297–321. arXiv:1502.01628Freely accessible. Bibcode:2015aste.book..297N. doi:10.2458/azu_uapress_9780816532131-ch016. Retrieved 3 February 2018. 
  25. ^ Kelley, Michael S.; Vilas, Faith; Gaffey, Michael J.; Abell, Paul A. (September 2003). "Quantified mineralogical evidence for a common origin of 1929 Kollaa with 4 Vesta and the HED meteorites". Icarus. 165 (1): 215–218. Bibcode:2003Icar..165..215K. doi:10.1016/S0019-1035(03)00149-0. Retrieved 3 February 2018. 
  26. ^ Tanga, P.; Hestroffer, D.; Cellino, A.; Lattanzi, M.; Di Martino, M.; Zappalà, V. (April 2003). "Asteroid observations with the Hubble Space Telescope. II. Duplicity search and size measurements for 6 asteroids". Astronomy and Astrophysics: 733–741. Bibcode:2003A&A...401..733T. doi:10.1051/0004-6361:20030032. Retrieved 3 February 2018. 
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  28. ^ Johnston, Wm. Robert (29 December 2017). "Other Reports of Asteroid/TNO Companions". Johnston's Archive. Retrieved 3 February 2018. 

External links[edit]