173 Ino

173 Ino
	VLT-SPHERE image of Ino
Discovery
Discovered by	A. Borrelly
Discovery site	Marseille
Discovery date	1 August 1877
Designations
Pronunciation	/ˈaɪnoʊ/ EYE-noh
Named after	Ἰνώ Īnṓ (Greek mythology)
Alternative designations	A877 PA; 1922 SB
Minor planet category	main-belt · (middle); Ino
Adjectives	Inoan (/aɪˈnoʊən/ eye-NOH-ən)
Orbital characteristics
	Epoch 23 March 2018 (JD 2458200.5)
	Uncertainty parameter 0
Observation arc	138.75 yr (50,678 d)
Aphelion	3.3142 AU
Perihelion	2.1708 AU
Semi-major axis	2.7425 AU
Eccentricity	0.2085
Orbital period (sidereal)	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°
Argument of perihelion	228.89°
Physical characteristics
Dimensions	(162 × 152 × 123) ± 8 km
Mean diameter	145±3 km
Mass	(3.01±0.16)×1018 kg
Mean density	1.89±0.16 g/cm3
Synodic rotation period	6.110939±0.000001 h
Axial tilt	95°
Pole ecliptic longitude	28° ± 2°
Pole ecliptic latitude	−17° ± 2°
Geometric albedo	0.061 (calculated); 0.059; 0.06±0.02; 0.0642±0.003; 0.07±0.05; 0.096±0.018
Spectral type	Tholen = C; SMASS = Xc/Xk; B–V = 0.705; U–B = 0.305
Absolute magnitude (H)	7.80; 7.66; 7.91; 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 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. 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 (522), an asteroid family in the intermediate main belt with nearly 500 known members.^: 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 slightly retrograde orientation.

Notes

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

References

1 2 3 4 "173 Ino". Minor Planet Center. Retrieved 18 April 2018.
↑ Noah Webster (1884) A Practical Dictionary of the English Language
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.
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.
1 2 "Asteroid 173 Ino". Small Bodies Data Ferret. Archived from the original on 20 August 2020. Retrieved 24 October 2019.
↑ George Stuart (1882) The Eclogues, Georgics, and Moretum of Virgil, p. 271
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
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.
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)
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.
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.
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.
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.
↑ 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.
1 2 "MinorPlanet.info: One Asteroid Information". Asteroid Lightcurve Database (LCDB). Search using Number = "173"
↑ 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.
↑ 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.
↑ 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.

External links

Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
Dictionary of Minor Planet Names, Google books
Asteroids and comets rotation curves, CdR Archived 8 December 2024 at the Wayback Machine – 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 viewer · Orbit parameters · Physical parameters

[9] Calculated from its standard gravitational parameter GM = 0.201±0.011 km³/s².

[MPC-object-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

[springer-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.

[jpldata-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.

[Ferret-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

[VLT-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

[Fuentes-Muñoz2025-8] 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.

[AKARI-10] 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)

[Nugent-2015-11] 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.

[SIMPS-12] 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.

[Nugent-2016-13] 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.

[Masiero-2012-14] 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.

[Warner-2007i-15] 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.

[lcdb-16] 1 2 "MinorPlanet.info: One Asteroid Information". Asteroid Lightcurve Database (LCDB). Search using Number = "173"

[Veres-2015-17] 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.

[Nesvorny-2014-18] 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.

[Michalowski-2005-19] 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.