| 词条 | 85 Io | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 释义 |
| minorplanet = yes | background = #D6D6D6 | name = 85 Io | image = 85Io (Lightcurve Inversion).png | image_size = 265 | caption = Lightcurve-based 3D-model of Io | discoverer = C. H. F. Peters | discovered = September 19, 1865 | mpc_name = (85) Io | alt_names = A899 LA{{·}}A899 UA | pronounced = {{IPAc-en|ˈ|aɪ|.|oʊ}} {{respell|EYE|oh}} | named_after = Io {{small|Greek mythology)}} | mp_category = main-belt{{·}}{{small|(middle)}} Eunomian interloper | orbit_ref = [1] | epoch = 4 September 2017 (JD 2458000.5) | uncertainty = 0 | observation_arc = 151.35 yr (55,280 days) | aphelion = 3.1679 AU | perihelion = 2.1379 AU | semimajor = 2.6529 AU | eccentricity = 0.1941 | period = 4.32 yr (1,578 days) | mean_anomaly = 83.678° | mean_motion = {{Deg2DMS|0.2281|sup=ms}} / day | inclination = 11.961° | asc_node = 203.12° | arg_peri = 123.11° | dimensions = 180×160×160 km[2][3] | density = 1.4 g/cm³ {{small|(estimate)}} | rotation = 0.2864 d (6.875 h)[1] | albedo = 0 .067[1] | spectral_type = FC {{small|(Tholen)}}[1] B {{small|(SMASSII)}}[1] | abs_magnitude = 7.61[1] }} Io ({{IPAc-en|ˈ|aɪ|.|oʊ}} {{respell|EYE|oh}}; minor planet designation: 85 Io is carbonaceous asteroid from the central region of the asteroid belt, approximately 170 kilometers in diameter. It is an identified Eunomian interloper. Discovery and namingIt was discovered by C. H. F. Peters on September 19, 1865, and named after Io, a lover of Zeus in Greek mythology. Io is also the name of the volcanic satellite of Jupiter. With a two-digit number and a two-letter name, 85 Io has the shortest designation of all minor planets. Orbit and physical characteristicsIo is a retrograde rotator, with its pole pointing towards one of ecliptic coordinates (β, λ) = (-45°, 105°) or (-15°, 295°) with a 10° uncertainty.[2] This gives an axial tilt of about 125° or 115°, respectively. Its shape is quite regular. In the SMASS classification, Io is a carbonaceous C-type asteroid, which means that it is probably a primitive body composed of carbonates. Like 141 Lumen it is an interloper that orbits within the Eunomia asteroid family but it is not related to the shattered parent body. An Ionian diameter of 178 kilometres was measured from an occultation of a star on December 10, 1995.[3] Another asteroid occultation of Io (magnitude 13.2) occurred on March 12, 2009, from the eastern United States, with the star 2UCAC 35694429 (magnitude 13.8).[1]
See also
References1. ^http://www.asteroidoccultation.com/2009_03/0312_85_20455.htm {{dead link|date=September 2015}} [2][3][4]2. ^1 2 3 4 5 6 {{cite web |title=JPL Small-Body Database Browser: 85 Io |url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=85 |publisher=Jet Propulsion Laboratory |accessdate=1 November 2017}} 3. ^1 2 {{cite journal |last=Torppa |first=J. |display-authors=etal |journal=Icarus |volume=164 |page=346 |url=http://www.rni.helsinki.fi/~mjk/thirty.pdf |title=Shapes and rotational properties of thirty asteroids from photometric data |format=PDF |date=2003 |doi=10.1016/s0019-1035(03)00146-5|bibcode = 2003Icar..164..346T }} 4. ^1 2 {{cite journal |last1=Erikson |first1=A. |last2=Berthier |first2=J. |last3=Denchev |first3=P.V. |bibcode=1999P&SS...47..327E |title=Photometric observations and modelling of the asteroid 85 Io in conjunction with data from an occultation event during the 1995-96 apparition |journal=Planetary and Space Science |volume=47 |pages=327–330 |date=1999 |doi=10.1016/S0032-0633(98)00128-7}} }} External links
8 : Eunomia asteroids|Discoveries by Christian Peters|Minor planets named from Greek mythology|Named minor planets|Objects observed by stellar occultation|FC-type asteroids (Tholen)|B-type asteroids (SMASS)|Astronomical objects discovered in 1865 |
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