68 Leto
.png) A three-dimensional model of 68 Leto based on its lightcurve | |
| Discovery | |
|---|---|
| Discovered by | Karl Theodor Robert Luther |
| Discovery date | 29 April 1861 |
| Designations | |
| Pronunciation | /ˈlɛtoʊ/[1] |
Named after | Λητώ Lētō |
| Main belt | |
| Adjectives | Letoian /liːˈtoʊ.iən/[2][3] |
| Orbital characteristics[4] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 152.08 yr (55548 d) |
| Aphelion | 3.30153 AU (493.902 Gm) |
| Perihelion | 2.26072 AU (338.199 Gm) |
| 2.78112 AU (416.050 Gm) | |
| Eccentricity | 0.18712 |
| 4.64 yr (1,694.1 d) | |
| 48.7204° | |
| 0° 12m 45.025s / day | |
| Inclination | 7.97189° |
| 44.1270° | |
| 304.826° | |
| Physical characteristics | |
| 112 ± 14 km[5] 148 ± 25 km[6] | |
| Mass | (3.55±0.27)×1018 kg[7][a] |
Mean density | 2.09–4.83 g/cm3 (calculated) |
| 14.84547 h (0.618561 d)[6] | |
Pole ecliptic longitude | 103°[5] |
Pole ecliptic latitude | 43°[5] |
| 0.228±0.028[4] 0.228[8] | |
| S | |
| 9.56 (brightest) | |
| 6.90[4] | |
68 Leto is a large main belt asteroid that is orbiting the Sun. The asteroid was discovered by German astronomer Robert Luther on April 29, 1861, and is named after Leto, the mother of Apollo and Artemis in Greek mythology. It orbits at a distance of 2.78112 AU over 4.64 years and has an orbital eccentricity of 0.187. The orbital plane is inclined at an angle of 7.97° to the ecliptic.[4]
Photometric observations of 68 Leto during 1997 provided a rotation period of 14.856 ± 0.024 h.[9] It has an estimated cross-sectional size of 123 km. The spectral type is S, suggesting a stony, silicate composition.
Notes
[edit]- ↑ Calculated from its standard gravitational parameter GM = 0.237±0.018 km3/s2.
References
[edit]- ↑ "Leto". Lexico UK English Dictionary. Oxford University Press. Archived from the original on 22 March 2020.
- ↑ E. Alan Roberts (2013) The Courage of Innocence: (The Virgin of Phileros), p. 191
- ↑ Greek Λητῷος – Lētōi-os. Liddell, Henry George; Scott, Robert; A Greek–English Lexicon at the Perseus Project
- 1 2 3 4 "68 Leto". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 12 May 2016.
- 1 2 3 Hanuš, J.; Marchis, F.; Ďurech, J. (September 2013). "Sizes of main-belt asteroids by combining shape models and Keck adaptive optics observations". Icarus. 226 (1): 1045–1057. arXiv:1308.0446. Bibcode:2013Icar..226.1045H. doi:10.1016/j.icarus.2013.07.023. ISSN 0019-1035. S2CID 118710558.
- 1 2 Ďurech, Josef; Kaasalainen, Mikko; Herald, David; Dunham, David; Timerson, Brad; Hanuš, Josef; Frappa, Eric; Talbot, John; Hayamizu, Tsutomu; Warner, Brian D.; Pilcher, Frederick; Galád, Adrián (1 August 2011). "Combining asteroid models derived by lightcurve inversion with asteroidal occultation silhouettes". Icarus. 214 (2): 652–670. arXiv:1104.4227. Bibcode:2011Icar..214..652D. doi:10.1016/j.icarus.2011.03.016. ISSN 0019-1035. S2CID 119271216.
- ↑ 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.
- ↑ "Asteroid Data Sets". Archived from the original on 17 December 2009. Retrieved 13 January 2007.
- ↑ López-González, M. J.; Rodríguez, E. (September 2005). "Lightcurves and poles of seven asteroids". Planetary and Space Science. 53 (11): 1147–1165. Bibcode:2005P&SS...53.1147L. doi:10.1016/j.pss.2005.04.010.
External links
[edit]- 68 Leto at AstDyS-2, Asteroids—Dynamic Site
- 68 Leto at the JPL Small-Body Database
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