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JPL Small-Body Database Browser
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190 Ismene
Classification: Outer Main-belt Asteroid          SPK-ID: 2000190
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 103 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1667079239858134 3.809e-08  
a 3.986862468896804 2.9825e-08 au
q 3.322220903490063 1.604e-07 au
i 6.176684908644778 4.9561e-06 deg
node 175.4558532372149 3.9464e-05 deg
peri 271.1249656470371 4.2444e-05 deg
M 308.8280946244736 1.8326e-05 deg
tp 2459413.808556126172
(2021-Jul-18.30855613)
0.00015068 TDB
period 2907.671291766736
7.96
3.2628e-05
8.933e-08
d
yr
n .1238104186739966 1.3893e-09 deg/d
Q 4.651504034303544 3.4797e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2732  
   data-arc span      45718 days (125.17 yr)  
   first obs. used      1894-11-06  
   last obs. used      2020-01-08  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47474  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jan-28 17:18:28  

Additional Information
 Earth MOID = 2.34663 au 
 Jupiter MOID = .768338 au 
 T_jup = 3.021 
[ 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 7.7   n/a MPO502154  
diameter diameter 159 km n/a J.G. Williams (E-mail September 1990) based on IRTF albedo of 0.066
rotation period rot_per 6.52 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Binzel, R.P.; Sauter, L.M. (1992) Icarus 95, 222-238.]
[Dahlgren, M.; Lahulla, J.F.; Lagerkvist, C.-I.; Lagerros, J.; et al. (1998) Icarus 133, 247-285.]
[Shevchenko, V.G.; Chiorny, V.G.; Gaftonyuk, N.M.; Krugly, Yu.N.; et al. (2005) Abstr. IAU Symp. 229, p. 133.]
[Shevchenko, V.G.; Chiorny, V.G.; Gaftonyuk, M.; Krugly, Y.N.; et al. (2008) Icarus 196, 601-611.]
[Dunckel, P.B. (2011) Posting on CALL site. http://www.minorplanet.info/call.html]
geometric albedo albedo 0.066   n/a J.G. Williams (E-mail September 1990) IRTF
B-V BV 0.683   0.017 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=.86, mean=9.06, max.=15.82) deg.
U-B UB 0.269   0.027 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=.86, mean=9.06, max.=15.82) deg.
Tholen spectral type spec_T P   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo
SMASSII spectral type spec_B X   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)

190 Ismene          Discovered 1878-Sep-22 by Peters, C. H. F. at Clinton
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1947 QJ = 1951 DB 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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