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128 Nemesis
Classification: Main-belt Asteroid          SPK-ID: 2000128
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 77 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1249135596043293 3.2364e-08  
a 2.752199634344552 7.6169e-09 AU
q 2.408412581276841 9.0034e-08 AU
i 6.245807245447995 3.7986e-06 deg
node 76.39189610652251 3.5824e-05 deg
peri 303.5536577245219 3.7973e-05 deg
M 86.39902239764861 1.2754e-05 deg
tp 2456600.256162560913
(2013-Nov-03.75616256)
5.894e-05 JED
period 1667.701525775512
4.57
6.9232e-06
1.895e-08
d
yr
n .2158659654835978 8.9613e-10 deg/d
Q 3.095986687412264 8.5683e-09 AU
  Orbit Determination Parameters
   # obs. used (total)      1394  
   data-arc span      51831 days (141.91 yr)  
   first obs. used      1872-11-26  
   last obs. used      2014-10-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .60685  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Nov-10 12:41:05  

Additional Information
 Earth MOID = 1.41807 AU 
 T_jup = 3.325 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 7.49 mag n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 12
diameter diameter 188.16 km 4.0 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 12
rotation period rot_per 39. h n/a Asteroid Lightcurve DataBase (Rev. 2014-Mar-01) Published Reference List:
[Scaltriti, F.; Zappala, V.; Schober, H.J. (1979) Icarus 37, 133-141.]
geometric albedo albedo 0.0504   0.002 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 12
B-V BV .685 mag .021 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=2; phase (min.=13.02, mean=16.03, max.=19.03) deg.
U-B UB .392 mag .044 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=2; phase (min.=13.02, mean=16.03, max.=19.03) deg.
Tholen spectral type spec_T C   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo
SMASSII spectral type spec_B C   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)

128 Nemesis          Discovered 1872-Nov-25 by Watson, J. C. at Ann Arbor
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1952 HW1 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
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