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JPL Small-Body Database Browser
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98 Ianthe
Classification: Main-belt Asteroid          SPK-ID: 2000098
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 77 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1867543762640761 3.0776e-08  
a 2.687760365416823 8.3279e-09 au
q 2.185809354826099 8.1294e-08 au
i 15.5715183183792 3.1208e-06 deg
node 353.9207046140522 1.539e-05 deg
peri 158.7254620457785 1.9375e-05 deg
M 125.6190486527247 1.2557e-05 deg
tp 2458038.886880850652
(2017-Oct-12.38688085)
5.5017e-05 TDB
period 1609.475036327461
4.41
7.4803e-06
2.048e-08
d
yr
n .2236754170611162 1.0396e-09 deg/d
Q 3.189711376007547 9.8831e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2357  
   data-arc span      54469 days (149.13 yr)  
   first obs. used      1870-10-17  
   last obs. used      2019-12-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44213  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-13 20:37:03  

Additional Information
 Earth MOID = 1.20184 au 
 Jupiter MOID = 1.81081 au 
 T_jup = 3.296 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 8.9   n/a MPO492749 IRAS observations used: 23
diameter diameter 132.788 km 1.132 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 16.479 h n/a LCDB (Rev. 2019-January); 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 Bull. 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]
[Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.]
geometric albedo albedo 0.029   0.002 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
B-V BV 0.749   0.020 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=11.51, mean=16.35, max.=21.20) deg.
U-B UB 0.375   0.056 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #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 | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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