173 Ino
Discovery[1]
Discovered byA. Borrelly
Discovery siteMarseille
Discovery date1 August 1877
Designations
(173) Ino
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
Dimensionsc/a = 0.76±0.06[7]
Mean diameter
145±3 km[7]
119±27 km[8]
125.8±1.5 km[9]
148±42 km[10]
154.1±3.5 km[11]
160.6 km[12]
Mass(2.2±1.3)×1018 kg[7]
(4.79±3.11)×1018 kg[13]
Mean density
1.4±0.8 g/cm3[7]
2.23±1.47 g/cm3[13]
5.93 h[14]
6.1±0.2 h[15]
6.106±0.001 h[15]
6.1088±0.0007 h[15]
6.11 h[16]
6.113±0.002 h[17]
6.11651 h[18]
6.15 h[19]
6.163 h[20]
0.061 (calculated)[7]
0.059[12]
0.06±0.02[10]
0.0642±0.003[11]
0.07±0.05[8]
0.096±0.018[9]
Tholen = C[4]
SMASS = Xk[4]
B–V = 0.705[4]
U–B = 0.305[4]
7.66[4][9][10][11][12][21]
7.80±0.05[22]
7.90[8][23]

    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.[21]

    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.[24]: 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.[18]

    References

    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 "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. Retrieved 24 October 2019.
    6. ↑ George Stuart (1882) The Eclogues, Georgics, and Moretum of Virgil, p. 271
    7. 1 2 3 4 5 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 3 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.
    9. 1 2 3 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.
    10. 1 2 3 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 3 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 3 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. (online, AcuA catalog p. 153)
    13. 1 2 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.
    14. ↑ 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.
    15. 1 2 3 Behrend, Raoul. "Asteroids and comets rotation curves – (173) Ino". Geneva Observatory. Retrieved 18 April 2018.
    16. ↑ 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.
    17. ↑ 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.
    18. 1 2 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.
    19. ↑ 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.
    20. ↑ 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.
    21. 1 2 "LCDB Data for (173) Ino". Asteroid Lightcurve Database (LCDB). Retrieved 18 April 2018.
    22. ↑ 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.
    23. ↑ 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.
    24. ↑ 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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