173 Ino

Ino, minor planet designation: 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.[20]

173 Ino
Discovery [1]
Discovered byA. Borrelly
Discovery siteMarseille
Discovery date1 August 1877
Designations
(173) Ino
Pronunciation/ˈaɪnoʊ/[2]
Named after
Ἰνώ Īnō[3] (Greek mythology)
A922 SB
main-belt [1][4] · (middle)
Ino [5]
AdjectivesInoan /aɪˈnoʊən/[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
Mean diameter
118.70±27.07 km[7]
125.821±1.489 km[8]
147.50±41.69 km[9]
154.10±3.5 km[10]
160.61 km[11]
Mass(4.79±3.11)×1018 kg[12]
Mean density
2.23±1.47 g/cm3[12]
5.93 h[13]
6.1±0.2 h[14]
6.106±0.001 h[14]
6.1088±0.0007 h[14]
6.11 h[15]
6.113±0.002 h[16]
6.11651 h[17]
6.15 h[18]
6.163 h[19]
0.059[11]
0.06±0.02[9]
0.0642±0.003[10]
0.07±0.05[7]
0.096±0.018[8]
Tholen = C [4]
SMASS = Xk [4]
B–V = 0.705[4]
U–B = 0.305[4]
7.66[4][8][9][10][11][20]
7.80±0.05[21]
7.90[7][22]

    Orbit and classification

    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.[23]: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

    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 retrograde direction.[17]

    References
    1. "173 Ino". Minor Planet Center. Retrieved 18 April 2018.
    2. Noah Webster (1884) A Practical Dictionary of the English Language
    3. Schmadel, Lutz D. (2007). "(173) Ino". Dictionary of Minor Planet Names – (173) Ino. Springer Berlin Heidelberg. p. 30. doi:10.1007/978-3-540-29925-7_174. ISBN 978-3-540-00238-3.
    4. "JPL Small-Body Database Browser: 173 Ino" (2017-10-21 last obs.). Jet Propulsion Laboratory. Retrieved 18 April 2018.
    5. "Asteroid 173 Ino". Small Bodies Data Ferret. Retrieved 24 October 2019.
    6. George Stuart (1882) The Eclogues, Georgics, and Moretum of Virgil, p. 271
    7. 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.
    8. 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.
    9. 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.
    10. 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.
    11. 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 17 October 2019. (online, AcuA catalog p. 153)
    12. Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, 73 (1): 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009 See Table 1.
    13. Schober, H. J. (December 1978). "Photometric Variations of the Minor Planets 55 Pandora and 173 Ino during the Opposition in 1977: Light Curves and Rotation Periods". Astronomy and Astrophysics Supplement. 34: 377. Bibcode:1978A&AS...34..377S. Retrieved 18 April 2018.
    14. Behrend, Raoul. "Asteroids and comets rotation curves – (173) Ino". Geneva Observatory. Retrieved 18 April 2018.
    15. Erikson, A. (December 1989). "Improvement of Rotation Periods for the Asteroids 12 Victoria, 173 Ino and 1245 Calvinia". Asteroids: 55. Bibcode:1990acm..proc...55E. Retrieved 18 April 2018.
    16. Gandolfi, D.; Cigna, M.; Fulvio, D.; Blanco, C. (January 2009). "CCD and photon-counting photometric observations of asteroids carried out at Padova and Catania observatories". Planetary and Space Science. 57 (1): 1–9. arXiv:0810.1560. Bibcode:2009P&SS...57....1G. doi:10.1016/j.pss.2008.09.014.
    17. 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. Retrieved 18 April 2018.
    18. Debehogne, H.; Lagerkvist, C.-I.; Magnusson, P.; Hahn, G. (December 1989). "Physical studies of asteroids XX - Photoelectric photometry of asteroids". Asteroids: 45. Bibcode:1990acm..proc...45D. Retrieved 18 April 2018.
    19. Michalowski, Tadeusz (December 1993). "Poles, shapes, senses of rotation, and sidereal periods of asteroids". Icarus. 106 (2): 563. Bibcode:1993Icar..106..563M. doi:10.1006/icar.1993.1193. Retrieved 18 April 2018.
    20. "LCDB Data for (173) Ino". Asteroid Lightcurve Database (LCDB). Retrieved 18 April 2018.
    21. 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.
    22. 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.
    23. 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.

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