258 Tyche

258 Tyche
	Light curve-based 3D-model of 258 Tyche
Discovery [1]
Discovered by	R. Luther
Discovery site	Düsseldorf-Bilk Obs.
Discovery date	4 May 1886
Designations
MPC designation	(258) Tyche
Pronunciation	/ˈtaɪkiː/[2]
Named after	Tyche [3]
Alternative designations	A886 JA
Minor planet category	Eunomia · main-belt
Orbital characteristics [1]
	Epoch 31 July 2016 (JD 2457600.5)
	Uncertainty parameter 0
Observation arc	129.95 yr (47465 d)
Aphelion	3.1512 AU (471.41 Gm)
Perihelion	2.0838 AU (311.73 Gm)
Semi-major axis	2.6175 AU (391.57 Gm)
Eccentricity	0.20390
Orbital period (sidereal)	4.23 yr (1546.8 d)
Average orbital speed	18.42 km/s
Mean anomaly	157.95°
Mean motion	0° 13m 57.864s / day
Inclination	14.305°
Longitude of ascending node	207.59°
Argument of perihelion	155.01°
Earth MOID	1.09016 AU (163.086 Gm)
Jupiter MOID	2.34517 AU (350.832 Gm)
TJupiter	3.334
Physical characteristics
Dimensions	64.78±1.2 km [1]; 65 km [4]
Mass	~ 4×1017 kg (estimate)
Mean density	~ 2.7 g/cm3[5]
Synodic rotation period	10.041 h (0.4184 d) [1][6]
Geometric albedo	0.1676±0.006 [1]; 0.168 [4]
Temperature	~ 169 K; max: 268 K
Spectral type	B–V = 0.876; U–B = 0.459; S (Tholen), S (SMASS)
Absolute magnitude (H)	8.50

Tyche (minor planet designation: 258 Tyche) is a relatively large main belt asteroid discovered by Robert Luther at Düsseldorf-Bilk Observatory on 4 May 1886.[1] The stony S-type asteroid measures about 65 kilometers in diameter and has a perihelion of 2.1 AU.[1]

Tyche orbits very close to the Eunomia family of asteroids, and could be a member based on composition. However, it is larger than all family members apart from 15 Eunomia while lying at the very edge of the family group. Hence, there is a good chance that it is an unrelated interloper.

There is some uncertainty regarding Tyche's rotation period. Various authors give values from 9.983 to 10.041 hours.[7]

It was named after Greek goddess of fortune, Tyche, which is also the name of one of the Oceanids. Tyche's Roman equivalent is Fortuna, after which the asteroid 19 Fortuna is named.[3]

References

"JPL Small-Body Database Browser: 258 Tyche" (2015-09-21 last obs.). Jet Propulsion Laboratory. Retrieved 11 May 2016.
Noah Webster (1884) A Practical Dictionary of the English Language
Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names – (258) Tyche. Springer Berlin Heidelberg. p. 38. doi:10.1007/978-3-540-29925-7_259. ISBN 978-3-540-29925-7.
Supplemental IRAS Minor Planet Survey Archived June 23, 2006, at archive.today
Krasinsky, G.; Pitjeva, E. V.; Vasilyev, M. V.; Yagudina, E. I. (2002). "Hidden Mass in the Asteroid Belt". Icarus. 158 (1): 98–105. Bibcode:2002Icar..158...98K. doi:10.1006/icar.2002.6837.
PDS lightcurve data Archived June 14, 2006, at archive.today
Riccioli, D.; Blanco, C.; Cigna, M. (2001). "Rotational periods of asteroids II". Planetary and Space Science. 49 (7): 657. Bibcode:2001P&SS...49..657R. doi:10.1016/S0032-0633(01)00014-9.

External links

"258 Tyche". JPL Small-Body Database. Jet Propulsion Laboratory. SPK-ID: 2000258.
The Asteroid Orbital Elements Database
Minor Planet Discovery Circumstances
Asteroid Lightcurve Data File
Ephemeris
258 Tyche at AstDyS-2, Asteroids—Dynamic Site
- Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
258 Tyche at the JPL Small-Body Database

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[jpldata-1] "JPL Small-Body Database Browser: 258 Tyche" (2015-09-21 last obs.). Jet Propulsion Laboratory. Retrieved 11 May 2016.

[2] Noah Webster (1884) A Practical Dictionary of the English Language

[springer-3] Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names – (258) Tyche. Springer Berlin Heidelberg. p. 38. doi:10.1007/978-3-540-29925-7_259. ISBN 978-3-540-29925-7.

[IRAS-4] Supplemental IRAS Minor Planet Survey Archived June 23, 2006, at archive.today

[Krasinsky-5] Krasinsky, G.; Pitjeva, E. V.; Vasilyev, M. V.; Yagudina, E. I. (2002). "Hidden Mass in the Asteroid Belt". Icarus. 158 (1): 98–105. Bibcode:2002Icar..158...98K. doi:10.1006/icar.2002.6837.

[PDS-6] PDS lightcurve data Archived June 14, 2006, at archive.today

[Riccioli-7] Riccioli, D.; Blanco, C.; Cigna, M. (2001). "Rotational periods of asteroids II". Planetary and Space Science. 49 (7): 657. Bibcode:2001P&SS...49..657R. doi:10.1016/S0032-0633(01)00014-9.