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190 Ismene (A878 SA)
Classification: Outer Main-belt Asteroid          SPK-ID: 2000190
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 114 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1672251119207696 1.9829e-08  
a 3.989563759199975 2.2913e-08 au
q 3.322408513052713 8.4138e-08 au
i 6.175896238014692 8.6446e-07 deg
node 175.4462291707088 3.0457e-06 deg
peri 271.0493450776263 8.0433e-06 deg
M 357.9253527846088 7.8394e-06 deg
tp 2459413.273677886325
(2021-Jul-17.77367789)
6.3453e-05 TDB
period 2910.626922147877
7.97
2.5074e-05
6.865e-08
d
yr
n .1236846939264687 1.0655e-09 deg/d
Q 4.656719005347237 2.6744e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3424  
   data-arc span      46179 days (126.43 yr)  
   first obs. used      1894-11-06  
   last obs. used      2021-04-13  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .43536  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 10:40:05  

Additional Information
 Earth MOID = 2.34682 au 
 Jupiter MOID = .765558 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 7.70   n/a MPCxxxxx  
diameter diameter 159 km n/a J.G. Williams (E-mail September 1990) based on IRTF albedo of 0.066
rotation period rot_per 6.5210 h n/a LCDB (Rev. 2020-October); 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]
[Warner, B.D.; Stephens, R.D. (2020) Minor Planet Bull. 47, 123-124.]
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 (A878 SA)          Discovered 1878-Sep-22 by Peters, C. H. F. at Clinton
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 A878 SA = 1947 QJ = 1951 DB 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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