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98 Ianthe

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Main-belt asteroid

98 Ianthe
Discovery
Three-dimensional model of 98 Ianthe created based on light-curve.
Discovered by	Christian Heinrich Friedrich Peters
Discovery date	18 April 1868
Designations
MPC designation	(98) Ianthe
Pronunciation	/aɪˈænθiː/^[1]
Named after	Ianthe
Minor planet category	Main belt
Adjectives	Ianthean/aɪənˈθiːən/^[2]
Orbital characteristics^[3]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc	145.23 yr (53047 d)
Aphelion	3.18807 AU (476.928 Gm)
Perihelion	2.18872 AU (327.428 Gm)
Semi-major axis	2.68839 AU (402.177 Gm)
Eccentricity	0.18586
Orbital period (sidereal)	4.41yr (1610.0d)
Averageorbital speed	18.01 km/s
Mean anomaly	262.019°
Mean motion	0° 13^m 24.949^s / day
Inclination	15.5778°
Longitude of ascending node	354.000°
Argument of perihelion	158.686°
Earth MOID	1.20327 AU (180.007 Gm)
Jupiter MOID	1.81554 AU (271.601 Gm)
T_Jupiter	3.296
Physical characteristics
Dimensions	104.45±1.8 km^[3] 106.16 ± 3.76 km^[4]
Mass	(8.93 ± 1.99) × 10¹⁷ kg^[4]
Meandensity	1.42 ± 0.35 g/cm³^[4]
Equatorialsurface gravity	0.0292 m/s² (0.00298 g₀)
Equatorialescape velocity	0.0552 km/s
Synodic rotation period	16.479 h (0.6866 d)^[3]^[5]
Geometric albedo	0.0471±0.002^[3] 0.047^[6]
Temperature	~170K
Spectral type	C
Absolute magnitude (H)	8.84

98 Ianthe is a largemain-belt asteroid, named forthree figures inGreek mythology. It is very dark and is composed ofcarbonates. It was one of the numerous (for his time—the 19th century) discoveries byC. H. F. Peters, who found it on April 18, 1868, fromClinton,New York.

This body is orbiting theSun with aperiod of 4.41 years and aneccentricity of 0.186. Theorbital plane isinclined at an angle of 15.6° to theplane of the ecliptic. Measurements of the cross-section dimension yield a size of around 105 km.Photometric observations of this asteroid during 2007 at the Organ Mesa Observatory inLas Cruces, New Mexico were used to create alight curve plot. This showed asynodic rotation period of16.479±0.001 hours and a brightness variation of0.27±0.02magnitude during each cycle.^[5] It is classified as aC-type asteroid, indicating a dark,carbonaceous surface.

The detection of a candidate moon orbiting 98 Ianthe was announced in 2004.^[7]

^Benjamin Smith (1903)The Century Dictionary and Cyclopedia
^Francis & Tatum (1924)Martial's Epigrams, p. 223
^^a ^b ^c ^d"98 Ianthe".JPL Small-Body Database.NASA/Jet Propulsion Laboratory. Retrieved12 May 2016.
^^a ^b ^cCarry, B. (December 2012), "Density of asteroids",Planetary and Space Science, vol. 73, pp. 98–118,arXiv:1203.4336,Bibcode:2012P&SS...73...98C,doi:10.1016/j.pss.2012.03.009. See Table 1.
^^a ^bPilcher, Frederick (June 2008), "Period Determination for 84 Klio, 98 Ianthe, 102 Miriam 112 Iphigenia, 131 Vala, and 650 Amalasuntha",The Minor Planet Bulletin, vol. 35, no. 2, pp. 71–72,arXiv:1203.4336,Bibcode:2008MPBu...35...71P,doi:10.1016/j.pss.2012.03.009.
^Asteroid Data Sets Archived 2009-12-17 at theWayback Machine
^Venable, Roger (April 2004), "The probable detection of a moon of asteroid 98 Ianthe",Occultation Newsletter,11 (2), International Occultation Timing Association: 8,Bibcode:2004OccN...11b...8V

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Designation Groups List Moon Meanings of names
Asteroid	Active Aten asteroid Asteroid belt Family Jupiter trojan Near-Earth Spectral types
Distant minor planet	Centaur Neptune trojan Damocloid Trans-Neptunian object Detached Kuiper belt Oort cloud Scattered disc

Other

Authority control databases	JPL SBDB MPC

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