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173 Ino

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173 Ino
VLT-SPHERE image of Ino
Discovery[1]
Discovered byA. Borrelly
Discovery siteMarseille
Discovery date1 August 1877
Designations
Pronunciation/ˈaɪnoʊ/ EYE-noh[2]
Named after
Ἰνώ Īnṓ[3] (Greek mythology)
A877 PA; 1922 SB
main-belt[1][4] · (middle)
Ino[5]
AdjectivesInoan (/aɪˈnoʊən/ eye-NOH-ən)[6]
Orbital characteristics[4]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc138.75 yr (50,678 d)
Aphelion3.3142 AU
Perihelion2.1708 AU
2.7425 AU
Eccentricity0.2085
4.54 yr (1,659 d)
307.27°
0° 13m 1.2s / day
Inclination14.197°
148.18°
228.89°
Physical characteristics
Dimensions(162 × 152 × 123) ± 8 km[7]
145±3 km[7]
Mass(3.01±0.16)×1018 kg[8][a]
Mean density
1.89±0.16 g/cm3[8]
6.110939±0.000001 h[7]
95°[7]
28° ± 2°[7]
−17° ± 2°[7]
0.061 (calculated)[7]
0.059[9]
0.06±0.02[10]
0.0642±0.003[11]
0.07±0.05[12]
0.096±0.018[13][4]
Tholen = C[4]
SMASS = Xc[7]/Xk[4]
B–V = 0.705[4]
U–B = 0.305[4]
7.80[7][14]
7.66[13][10][11][9][15]
7.91[4]
7.90[12][16]

173 Ino is a large asteroid and the parent body of the Ino family, located in the central regions of the asteroid belt, approximately 150 kilometers (93 miles) in diameter. It was discovered on 1 August 1877, by French astronomer Alphonse Borrelly at Marseille Observatory in southern France, and named after the queen Ino from Greek mythology.[1][3] The dark Xk-type asteroid has a rotation period of 6.15 hours.[15]

Orbit and classification

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Ino is the parent body and namesake of the Ino family (522),[5] an asteroid family in the intermediate main belt with nearly 500 known members.[17]: 23  The adjectival form of the asteroid name is "Inoan".

It orbits the Sun in the central main-belt at a distance of 2.2–3.3 AU once every 4 years and 6 months (1,659 days; semi-major axis of 2.74 AU). Its orbit has an eccentricity of 0.21 and an inclination of 14° with respect to the ecliptic.[4] The body's observation arc begins at Düsseldorf-Bilk Observatory in January 1879, five months after its official discovery observation at Marseilles.[1]

Physical characteristics

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In the Tholen classification, Ino is a common carbonaceous C-type, while in the SMASS classification it is a Xk-subtype that transitions between the X-type and uncommon K-type asteroids.[4]

Multiple photometric studies of this asteroid were performed between 1978 and 2002. The combined data gave an irregular, asymmetrical light curve with a period of 6.163 ± 0.005 hours and a brightness variation of 0.10–0.15 in magnitude. The asteroid is rotating in a slightly retrograde orientation.[18]

Notes

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  1. ↑ Calculated from its standard gravitational parameter GM = 0.201±0.011 km3/s2.

References

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  1. 1 2 3 4 "173 Ino". Minor Planet Center. Retrieved 18 April 2018.
  2. ↑ Noah Webster (1884) A Practical Dictionary of the English Language
  3. 1 2 Schmadel, Lutz D. (2007). "(173) Ino". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 30. doi:10.1007/978-3-540-29925-7_174. ISBN 978-3-540-00238-3.
  4. 1 2 3 4 5 6 7 8 9 10 "JPL Small-Body Database Browser: 173 Ino" (2017-10-21 last obs.). Jet Propulsion Laboratory. Retrieved 18 April 2018.
  5. 1 2 "Asteroid 173 Ino". Small Bodies Data Ferret. Archived from the original on 20 August 2020. Retrieved 24 October 2019.
  6. ↑ George Stuart (1882) The Eclogues, Georgics, and Moretum of Virgil, p. 271
  7. 1 2 3 4 5 6 7 8 9 P. Vernazza et al. (2021) VLT/SPHERE imaging survey of the largest main-belt asteroids: Final results and synthesis. Astronomy & Astrophysics 54, A56
  8. 1 2 Fuentes-Muñoz, Oscar; Farnocchia, Davide; Giorgini, Jon D.; Park, Ryan S. (1 December 2025). "Asteroid Mass Estimation by Mutual Perturbations During Close Encounters After Gaia Focused Product Release". The Astronomical Journal. 170 (6): 353. Bibcode:2025AJ....170..353F. doi:10.3847/1538-3881/ae0cc9. ISSN 0004-6256. S2CID 283347135.
  9. 1 2 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. arXiv:1106.1948. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. (online, AcuA catalog p. 153)
  10. 1 2 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:1509.02522. Bibcode:2015ApJ...814..117N. doi:10.1088/0004-637X/814/2/117.
  11. 1 2 Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System. 12: IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode:2004PDSS...12.....T. Retrieved 22 October 2019.
  12. 1 2 Nugent, C. R.; Mainzer, A.; Bauer, J.; Cutri, R. M.; Kramer, E. A.; Grav, T.; et al. (September 2016). "NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos". The Astronomical Journal. 152 (3): 12. arXiv:1606.08923. Bibcode:2016AJ....152...63N. doi:10.3847/0004-6256/152/3/63.
  13. 1 2 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:1209.5794. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8.
  14. ↑ Warner, Brian D. (December 2007). "Initial Results of a Dedicated H-G Project". The Minor Planet Bulletin. 34 (4): 113–119. Bibcode:2007MPBu...34..113W. ISSN 1052-8091. Retrieved 18 April 2018.
  15. 1 2 "MinorPlanet.info: One Asteroid Information". Asteroid Lightcurve Database (LCDB). Search using Number = "173"
  16. ↑ 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.
  17. ↑ Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). "Identification and Dynamical Properties of Asteroid Families". Asteroids IV. pp. 297–321. arXiv:1502.01628. Bibcode:2015aste.book..297N. doi:10.2458/azu_uapress_9780816532131-ch016. ISBN 9780816532131.
  18. ↑ Michalowski, T.; Kaasalainen, M.; Marciniak, A.; Denchev, P.; Kwiatkowski, T.; Kryszczynska, A.; et al. (November 2005). "Photometry and models of selected main belt asteroids. II. 173 Ino, 376 Geometria, and 451 Patientia". Astronomy and Astrophysics. 443 (1): 329–335. Bibcode:2005A&A...443..329M. doi:10.1051/0004-6361:20053656.
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