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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 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 90 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1268534894034593 3.1567e-08  
a 2.749461882725817 7.6636e-09 au
q 2.400683048920242 8.7921e-08 au
i 6.245002830997875 3.625e-06 deg
node 76.247540609658 3.4965e-05 deg
peri 303.8595533969615 3.6926e-05 deg
M 215.6985203946266 1.2408e-05 deg
tp 2458267.980012013034
(2018-May-29.48001201)
5.7985e-05 JED
period 1665.21372463976
4.56
6.9622e-06
1.906e-08
d
yr
n .2161884655844281 9.0388e-10 deg/d
Q 3.098240716531392 8.6358e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1707  
   data-arc span      52373 days (143.39 yr)  
   first obs. used      1872-11-26  
   last obs. used      2016-04-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .5749  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Apr-25 12:25:35  

Additional Information
 Earth MOID = 1.40918 au 
 Jupiter MOID = 2.36425 au 
 T_jup = 3.326 
[ 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 77.81 h n/a LCDB (Rev. 2016-February); Warner et al., 2009 Published Reference List:
[Pilcher, F. (2015) Minor Planet Bul. 42, 190-192.]
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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