| 词条 | 258 Tyche |
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| minorplanet = yes | name = 258 Tyche | background = #D6D6D6 | image = 258Tyche (Lightcurve Inversion).png | image_size = 265 | caption = {{longitem|Light curve-based 3D-model of 258 Tyche|style=padding: 5px 0; line-height: 1.3em;}} | discovery_ref = [1] | discovered = 4 May 1886 | discoverer = R. Luther | discovery_site = Düsseldorf-Bilk Obs. | mpc_name = (258) Tyche | alt_names = | named_after = Tyche [2] | mp_category = Eunomia{{·}}main-belt | orbit_ref = [1] | epoch = 31 July 2016 (JD 2457600.5) | uncertainty = 0 | observation_arc = 129.95 yr (47465 d) | aphelion = {{Convert|3.1512|AU|Gm|abbr=on|lk=on}} | perihelion = {{Convert|2.0838|AU|Gm|abbr=on}} | semimajor = {{Convert|2.6175|AU|Gm|abbr=on}} | eccentricity = 0.20390 | period = 4.23 yr (1546.8 d) | mean_anomaly = 157.95° | inclination = 14.305° | asc_node = 207.59° | arg_peri = 155.01° | moid = {{Convert|1.09016|AU|Gm|abbr=on}} | avg_speed = 18.42 km/s{{citation needed|date=October 2015}} | mass = ~ 4×1017 {{small|(estimate)}} | dimensions = {{val|64.78|1.2|ul=km}} [1] 65 km | density = ~ 2.7 g/cm³[6] | rotation = {{Convert|10.041|h|d|abbr=on|lk=on}} [1][8] | albedo = {{val|0.1676|0.006}} [1] 0.168 | spectral_type = B–V = 0.876 U–B = 0.459 S {{small|(Tholen)}}, S {{small|(SMASS)}} | abs_magnitude = 8.50 | single_temperature= ~ 169 K {{small|max: 268 K}}{{citation needed|date=October 2015}} | mean_motion = {{Deg2DMS|0.23274|sup=ms}} / day | jupiter_moid = {{Convert|2.34517|AU|Gm|abbr=on}} | tisserand = 3.334 }}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.[13] 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.[2] References1. ^1 PDS lightcurve data {{webarchive |url=https://archive.is/20060614093519/http://www.psi.edu/pds/archive/lc.html |date=June 14, 2006 }} [1][2][3][4][5]2. ^1 D. Riccioli, C. Blanco, & M. Cigna Rotational periods of asteroids II, Planetary and Space Science, Vol. 49,, p. 657 (2001). 3. ^1 G. A. Krasinsky et al. Hidden Mass in the Asteroid Belt, Icarus, Vol. 158, p. 98 (2002). 4. ^1 2 3 4 5 6 7 {{cite web |type=2015-09-21 last obs. |title=JPL Small-Body Database Browser: 258 Tyche |url=https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2000258 |publisher=Jet Propulsion Laboratory |accessdate=11 May 2016}} 5. ^1 2 {{cite book |url=https://web.archive.org/web/20160309200912/https://link.springer.com/referenceworkentry/10.1007/978-3-540-29925-7_259 |title=Dictionary of Minor Planet Names – (258) Tyche |last=Schmadel |first=Lutz D. |publisher=Springer Berlin Heidelberg |page=38 |date=2003 |isbn=978-3-540-29925-7 |accessdate=14 October 2015}} }} External links
8 : Eunomia asteroids|Background asteroids|Discoveries by Robert Luther|Minor planets named from Greek mythology|Named minor planets|S-type asteroids (Tholen)|S-type asteroids (SMASS)|Astronomical objects discovered in 1886 |
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