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JPL Small-Body Database Browser
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98 Ianthe (A868 HA)
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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 78 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1872330483337261 3.0792e-08  
a 2.6864969579895 8.1439e-09 au
q 2.183495943205844 8.122e-08 au
i 15.57684757148328 3.1202e-06 deg
node 353.9043965427055 1.5352e-05 deg
peri 158.6319249196384 1.9305e-05 deg
M 215.2664156984709 1.2712e-05 deg
tp 2459647.113508493611
(2022-Mar-08.61350849)
5.832e-05 TDB
period 1608.340346030115
4.40
7.3133e-06
2.002e-08
d
yr
n .2238332209277671 1.0178e-09 deg/d
Q 3.189497972773156 9.6687e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2386  
   data-arc span      54493 days (149.19 yr)  
   first obs. used      1870-10-17  
   last obs. used      2019-12-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43748  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 15:17:03  

Additional Information
 Earth MOID = 1.19912 au 
 Jupiter MOID = 1.80982 au 
 T_jup = 3.297 
[ hide covariance matrix ]
Orbital Elements at Epoch 2454597.5 (2008-May-11.0) TDB
Reference: JPL 78 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1892696476563971 3.0944e-08  
q 2.177237971632606 8.1905e-08 au
tp 2454819.358435037973
(2008-Dec-18.85843504)
4.941e-05 TDB
node 354.1276733413076 1.5309e-05 deg
peri 158.4869883313772 1.9143e-05 deg
i 15.60960941701489 3.125e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2386  
   data-arc span      54493 days (149.19 yr)  
   first obs. used      1870-10-17  
   last obs. used      2019-12-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43748  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 15:17:03  

Additional Information
 Jupiter MOID = 1.80982 au 
 T_jup = 3.297 
Orbit Covariance (6×6)
  e q tp node peri i
e 9.575479794097963E-16 -2.526900373234693E-15 -1.774791271838684E-13 2.42478634230359E-15 -3.509794939687208E-15 -2.526110587079274E-15
q -2.526900373234693E-15 6.708408494353575E-15 5.188494034510394E-13 -8.486913688456572E-15 1.968832914012708E-14 6.840002836798229E-15
tp -1.774791271838684E-13 5.188494034510394E-13 2.441363494411858E-9 -2.613586990629525E-12 5.876620258941799E-10 1.015432227429848E-11
node 2.42478634230359E-15 -8.486913688456572E-15 -2.613586990629525E-12 2.343503949047952E-10 -2.256798502505376E-10 2.552288854126195E-12
peri -3.509794939687208E-15 1.968832914012708E-14 5.876620258941799E-10 -2.256798502505376E-10 3.664551190255192E-10 -1.264471300358274E-13
i -2.526110587079274E-15 6.840002836798229E-15 1.015432227429848E-11 2.552288854126195E-12 -1.264471300358274E-13 9.765496123894069E-12

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-August); 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 (A868 HA)          Discovered 1868-Apr-18 by Peters, C. H. F. at Clinton
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 A868 HA = 1931 RK1 = 1949 SE1 = 1975 XO 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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