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2560 Siegma (1932 CW)
Classification: Main-belt Asteroid          SPK-ID: 2002560
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 42 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0333496909960841 1.8556e-08  
a 2.751750177724885 1.0777e-08 au
q 2.659980159599341 5.3136e-08 au
i 5.944403630870894 4.2797e-07 deg
node 148.323587848433 9.9761e-06 deg
peri 283.6434411412797 3.6834e-05 deg
M 253.2992305353314 3.9608e-05 deg
tp 2459694.670688906823
(2022-Apr-25.17068891)
0.00018448 TDB
period 1667.293018588437
4.56
9.7952e-06
2.682e-08
d
yr
n .2159188552860271 1.2685e-09 deg/d
Q 2.84352019585043 1.1137e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2844  
   data-arc span      32447 days (88.84 yr)  
   first obs. used      1932-02-14  
   last obs. used      2020-12-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .44217  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 13:56:52  

Additional Information
 Earth MOID = 1.68199 au 
 Jupiter MOID = 2.23606 au 
 T_jup = 3.337 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.05   n/a MPCxxxxx  
diameter diameter 17.976 km 0.173 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 10.309 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.099   0.011 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
SMASSII spectral type spec_B Xc   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)

2560 Siegma (1932 CW)          Discovered 1932-Feb-14 by Reinmuth, K. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1932 CW = 1950 DO1 = 1952 OO = 1952 RB = 1957 TH = 1962 WC = 1973 FW1 = 1980 TK15 = 1982 BF1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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