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98 Ianthe
Classification: Main-belt Asteroid          SPK-ID: 2000098
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 56 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .185852396661553 3.0883e-08  
a 2.688648307775509 1.0497e-08 AU
q 2.188956575995402 8.2407e-08 AU
i 15.5764830259341 3.1804e-06 deg
node 354.0041082470964 1.6577e-05 deg
peri 158.5717159544243 2.103e-05 deg
M 128.0297605983918 1.1847e-05 deg
tp 2456427.825486287729
(2013-May-15.32548629)
5.2502e-05 JED
period 1610.272673891162
4.41
9.4306e-06
2.582e-08
d
yr
n .2235646209719711 1.3093e-09 deg/d
Q 3.188340039555617 1.2448e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1180  
   data-arc span      52825 days (144.63 yr)  
   first obs. used      1870-10-17  
   last obs. used      2015-06-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .60639  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Jul-06 11:33:21  

Additional Information
 Earth MOID = 1.20531 AU 
 T_jup = 3.296 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 8.84 mag n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 23
diameter diameter 104.45 km 1.8 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 23
rotation period rot_per 16.479 h n/a LCDB (Rev. 2015-May); Warner et al., 2009 Published Reference List:
[Magnusson, P.; Lagerkvist, C.-I. (1991) Astron. Astrophys. Suppl. Ser. 87, 269-275.]
[Pilcher, F. (2008) Minor Planet Bul. 35, 71-72.]
[Behrend, R. (2009) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2011) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.0471   0.002 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 23
B-V BV .749 mag .020 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=2; phase (min.=11.51, mean=16.35, max.=21.20) deg.
U-B UB .375 mag .056 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=2; phase (min.=11.51, mean=16.35, max.=21.20) deg.
Tholen spectral type spec_T CG   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices
SMASSII spectral type spec_B Ch   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

98 Ianthe          Discovered 1868-Apr-18 by Peters, C. H. F. at Clinton
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1931 RK1 = 1949 SE1 = 1975 XO 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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