173 Ino

173 InoFile:173 Ino VLT (2021), deconvolved.pdf

Discovery[1]
Discovered by| A. Borrelly
Discovery site| Marseille
Discovery date| 1 August 1877
Designations

MPC designation

| (173) Ino
Pronunciation| /ˈaɪnoʊ/ EYE-noh[5]
Named after| Ἰνώ Īnṓ[2] (Greek mythology)

Alternative designations

| A877 PA; 1922 SB
Minor planet category| main-belt[1][3] * (middle)
Ino[4]
Adjectives| Inoan (/aɪˈnoʊən/ eye-NOH-ən)[6]
Orbital characteristics[3]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc| 138.75 yr (50,678 d)
|{{{apsis}}}|helion}}| 3.3142 AU
|{{{apsis}}}|helion}}| 2.1708 AU

Semi-major axis

| 2.7425 AU
Eccentricity| 0.2085
Orbital period| 4.54 yr (1,659 d)
Mean anomaly| 307.27°
Mean motion| 0° 13m 1.2s / day
Inclination| 14.197°
Longitude of ascending node| 148.18°

|{{{apsis}}}|helion}}

| 228.89°
Physical characteristics
Dimensions| c/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]
Rotation period| 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]
Geometric albedo| 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]

Spectral type

| Tholen = C[3]
SMASS = Xk[3]
B–V = 0.705[3]
U–B = 0.305[3]
Absolute magnitude (H)| 7.66[3][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][2] The dark Xk-type asteroid has a rotation period of 6.15 hours.[21]

## Contents

* 1 Orbit and classification
* 2 Physical characteristics
* 3 References
* 4 External links

## Orbit and classification

Ino is the parent body and namesake of the Ino family (522),[4] 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.[3] 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.[3]

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. ↑ 1.0 1.1 1.2 1.3 "173 Ino". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=173. Retrieved 18 April 2018.
2. ↑ 2.0 2.1 Schmadel, Lutz D. (2007). "(173) Ino". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. pp. 30. doi:10.1007/978-3-540-29925-7_174. ISBN 978-3-540-00238-3.
3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 "JPL Small-Body Database Browser: 173 Ino". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2000173. Retrieved 18 April 2018.
4. ↑ 4.0 4.1 "Asteroid 173 Ino". Small Bodies Data Ferret. https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=173+Ino. Retrieved 24 October 2019.
5. ↑ Noah Webster (1884) A Practical Dictionary of the English Language
6. ↑ George Stuart (1882) The Eclogues, Georgics, and Moretum of Virgil, p. 271
7. ↑ 7.0 7.1 7.2 7.3 7.4 P. Vernazza et al. (2021) VLT/SPHERE imaging survey of the largest main-belt asteroids: Final results and synthesis. Astronomy & Astrophysics 54, A56
8. ↑ 8.0 8.1 8.2 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. doi:10.3847/0004-6256/152/3/63. Bibcode: 2016AJ....152...63N.
9. ↑ 9.0 9.1 9.2 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. doi:10.1088/2041-8205/759/1/L8. Bibcode: 2012ApJ...759L...8M.
10. ↑ 10.0 10.1 10.2 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. doi:10.1088/0004-637X/814/2/117. Bibcode: 2015ApJ...814..117N.
11. ↑ 11.0 11.1 11.2 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. https://sbnarchive.psi.edu/pds3/iras/IRAS_A_FPA_3_RDR_IMPS_V6_0/data/diamalb.tab. Retrieved 22 October 2019.
12. ↑ 12.0 12.1 12.2 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. doi:10.1093/pasj/63.5.1117. Bibcode: 2011PASJ...63.1117U. (online, AcuA catalog p. 153)
13. ↑ 13.0 13.1 Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science 73 (1): 98–118, doi:10.1016/j.pss.2012.03.009, Bibcode: 2012P&SS...73...98C 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. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=1978A&AS...34..377S. Retrieved 18 April 2018.
15. ↑ 15.0 15.1 15.2 Behrend, Raoul. "Asteroids and comets rotation curves – (173) Ino". Geneva Observatory. http://obswww.unige.ch/~behrend/page1cou.html#000173. 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. http://adsabs.harvard.edu/cgi-bin/bib_query?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. doi:10.1016/j.pss.2008.09.014. Bibcode: 2009P&SS...57....1G.
18. ↑ 18.0 18.1 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. doi:10.1051/0004-6361:20053656. Bibcode: 2005A&A...443..329M.
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. http://adsabs.harvard.edu/cgi-bin/bib_query?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. doi:10.1006/icar.1993.1193. Bibcode: 1993Icar..106..563M. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=1993Icar..106..563M. Retrieved 18 April 2018.
21. ↑ 21.0 21.1 "LCDB Data for (173) Ino". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=173|Ino. 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. ISSN 1052-8091. Bibcode: 2007MPBu...34..113W. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2007MPBu...34..113W. 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. doi:10.1016/j.icarus.2015.08.007. Bibcode: 2015Icar..261...34V.
24. ↑ Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). "Identification and Dynamical Properties of Asteroid Families". Asteroids IV. pp. 297–321. doi:10.2458/azu_uapress_9780816532131-ch016. ISBN 9780816532131. Bibcode: 2015aste.book..297N.

## External links

* Asteroid Lightcurve Database (LCDB), query form (info )
* Dictionary of Minor Planet Names, Google books
* Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
* Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
* 173 Ino at AstDyS-2, Asteroids—Dynamic Site
* Ephemeris * Observation prediction * Orbital info * Proper elements * Observational info
* 173 Ino at the JPL Small-Body Database
* Close approach * Discovery * Ephemeris * Orbit diagram * Orbital elements * Physical parameters

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