| 词条 | 168 Sibylla |
| 释义 |
| minorplanet = yes | background = #D6D6D6 | image = | caption = | name = 168 Sibylla | discovery_ref = [1] | discoverer = J. C. Watson | discovered = 28 September 1876 | discovery_site = Ann Arbor | mpc_name = (168) Sibylla | mp_category = main-belt | alt_names = | pronounced={{IPAc-en|s|ᵻ|'|b|ɪ|l|ə}} | orbit_ref = [2] | epoch = 31 July 2016 (JD 2457600.5) | aphelion = {{Convert|3.6215|AU|Gm|abbr=on|lk=on}} | perihelion = {{Convert|3.1417|AU|Gm|abbr=on}} | semimajor = {{Convert|3.3816|AU|Gm|abbr=on}} | eccentricity = 0.070943 | period = 6.22 yr (2271.4 d) | avg_speed = 16.19 km/s | inclination = 4.6617° | asc_node = 205.959° | mean_anomaly = 171.517° | arg_peri = 173.920° | dimensions = {{val|148.39|4.0|ul=km}} 149.06 ± 4.29 km[5] | mass = {{nowrap|(3.92 ± 1.80) × 1018 kg[5]}} | density = 2.26 ± 1.05 g/cm3[5] | sidereal_day = 23.82 hours[8] | pole_ecliptic_lat = | pole_ecliptic_lon = | albedo = {{val|0.0535|0.003}} | spectral_type = C | abs_magnitude = 7.94 | mean_motion = {{Deg2DMS|0.15849|sup=ms}} / day | observation_arc = 136.01 yr (49676 d) | uncertainty = 0 | rotation = {{Convert|47.009|h|d|abbr=on|lk=on}} }} Sibylla (minor planet designation: 168 Sibylla) is a large main-belt asteroid, discovered by Canadian-American astronomer J. C. Watson on September 28, 1876. Based upon its spectrum this object is classified as a C-type asteroid, which indicates it is very dark and composed of primitive carbonaceous materials. 168 Sibylla is a Cybele asteroid, orbiting beyond most of the main-belt asteroids. Photometric observations of this asteroid made at the Torino Observatory in Italy during 1990–1991 were used to determine a synodic rotation period of 23.82 ± 0.004 hours.[8]References1. ^{{cite web | url=http://www.minorplanetcenter.net/iau/lists/NumberedMPs000001.html | title=Discovery Circumstances: Numbered Minor Planets (1)-(5000) | accessdate=August 14, 2012}} [3][4]2. ^{{Cite web |url=ftp://ftp.lowell.edu/pub/elgb/astorb.html |website=astorb |title=The Asteroid Orbital Elements Database |publisher=Lowell Observatory |accessdate=August 14, 2012}} 3. ^1 2 3 {{Citation | first1 = B. | last1 = Carry | title = Density of asteroids | work = Planetary and Space Science | volume = 73 | pages = 98–118 |date=December 2012 | doi = 10.1016/j.pss.2012.03.009 | bibcode = 2012P&SS...73...98C | postscript= . |arxiv = 1203.4336}} See Table 1. 4. ^1 2 {{Citation | last1 = di Martino | first1 = M. | last2 = Blanco | first2 = C. | last3 = Riccioli | first3 = D. | last4 = de Sanctis | first4 = G. | display-authors = 1 | title = Lightcurves and rotational periods of nine main belt asteroids | work = Icarus | volume = 107 | issue = 2 | pages = 269–275 |date=February 1994 | doi = 10.1006/icar.1994.1022 | bibcode = 1994Icar..107..269D | postscript= .}} }} External links
7 : Cybele asteroids|Discoveries by James Watson|Minor planets named from Greek mythology|Named minor planets|C-type asteroids (Tholen)|Ch-type asteroids (SMASS)|Astronomical objects discovered in 1876 |
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