173 Ino
{{Use dmy dates|date=April 2018}}
{{Infobox planet
| minorplanet = yes
| name = 173 Ino
| background = #D6D6D6
| image = 173 Ino VLT (2021), deconvolved.pdf
| image_size =
| caption =
| discoverer = A. Borrelly
| discovery_site = Marseille
| discovered = 1 August 1877
| mpc_name = (173) Ino
| alt_names = A877 PA; 1922 SB
| pronounced = {{IPAc-en|'|aɪ|n|oʊ}} {{respell|EYE|noh}}Noah Webster (1884) A Practical Dictionary of the English Language
| adjectives = Inoan ({{IPAc-en|aɪ|ˈ|n|oʊ|@|n}} {{respell|eye|NOH|ən}})George Stuart (1882) The Eclogues, Georgics, and Moretum of Virgil, p. 271
| named_after = Ἰνώ Īnṓ {{small|(Greek mythology)}}
| mp_category = main-belt{{·}}{{small|(middle)}}
Ino
| epoch = 23 March 2018 (JD 2458200.5)
| uncertainty = 0
| observation_arc = 138.75 yr (50,678 d)
| aphelion = 3.3142 AU
| perihelion = 2.1708 AU
| semimajor = 2.7425 AU
| eccentricity = 0.2085
| period = 4.54 yr (1,659 d)
| mean_anomaly = 307.27°
| mean_motion = {{Deg2DMS|0.2170|sup=ms}} / day
| inclination = 14.197°
| asc_node = 148.18°
| arg_peri = 228.89°
| flattening = 0.24{{efn|1=Flattening derived from the maximum aspect ratio (c/a): , where (c/a) = {{val|0.76|0.06}}.}}
| mean_diameter = {{val|145|3|u=km}}P. Vernazza et al. (2021) VLT/SPHERE imaging survey of the largest main-belt asteroids: Final results and synthesis. Astronomy & Astrophysics 54, A56
{{val|119|27|ul=km}}
{{val|125.8|1.5|u=km}}
{{val|148|42|u=km}}
{{val|154.1|3.5|u=km}}
{{val|160.6|u=km}}
| mass = {{val|2.2|1.3|e=18|u=kg}}
{{val|4.79|3.11|e=18|ul=kg}}
| density = {{val|1.4|0.8|u=g/cm3}}
{{val|2.23|1.47|u=g/cm3}}
| rotation = {{val|5.93|ul=h}}
{{val|6.1|0.2|u=h}}
{{val|6.106|0.001|u=h}}
{{val|6.1088|0.0007|u=h}}
{{val|6.11|u=h}}
{{val|6.113|0.002|u=h}}
{{val|6.11651|u=h}}
{{val|6.15|u=h}}
{{val|6.163|u=h}}
| albedo = 0.061 (calculated)
{{val|0.059}}
{{val|0.06|0.02}}
{{val|0.0642|0.003}}
{{val|0.07|0.05}}
{{val|0.096|0.018}}
| spectral_type = Tholen {{=}} C
SMASS {{=}} Xk
B–V {{=}} 0.705
U–B {{=}} 0.305
| abs_magnitude = 7.66
7.99
{{val|7.80|0.05}}
7.90
}}
173 Ino is a large asteroid and the parent body of the Ino family, located in the central regions of the asteroid belt, approximately {{convert|150|km|mi|abbr=off|sigfig=2|sp=us}} 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. The dark Xk-type asteroid has a rotation period of 6.15 hours.
Orbit and classification
Ino is the parent body and namesake of the Ino family ({{small|522}}), an asteroid family in the intermediate main belt with nearly 500 known members.{{rp|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. The body's observation arc begins at Düsseldorf-Bilk Observatory in January 1879, five months after its official discovery observation at Marseilles.
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.
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.
Notes
{{notelist}}
References
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External links
- [http://www.minorplanet.info/PHP/lcdbsummaryquery.php Asteroid Lightcurve Database (LCDB)], query form ([http://www.minorplanet.info/lightcurvedatabase.html info] {{Webarchive|url=https://web.archive.org/web/20171216050541/http://www.minorplanet.info/lightcurvedatabase.html |date=16 December 2017 }})
- [https://books.google.com/books?id=aeAg1X7afOoC&pg Dictionary of Minor Planet Names], Google books
- [http://obswww.unige.ch/~behrend/page_cou.html Asteroids and comets rotation curves, CdR] – Observatoire de Genève, Raoul Behrend
- [https://www.minorplanetcenter.net/iau/lists/NumberedMPs000001.html Discovery Circumstances: Numbered Minor Planets (1)-(5000)] – Minor Planet Center
- {{AstDys|173}}
- {{JPL small body}}
{{Minor planets navigator |172 Baucis |number=173 |174 Phaedra}}
{{Small Solar System bodies}}
{{Authority control}}
{{DEFAULTSORT:000173}}