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555 Norma (A905 AF)
Classification: Main-belt Asteroid          SPK-ID: 2000555
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1499295032792856 3.208e-08  
a 3.1977682128914 1.4103e-08 au
q 2.718328413130304 9.9535e-08 au
i 2.656065099948871 3.5782e-06 deg
node 130.2089448939682 8.3282e-05 deg
peri 358.5501665832816 8.4285e-05 deg
M 154.5226132382683 1.302e-05 deg
tp 2458103.983179981548
(2017-Dec-16.48317998)		 7.5559e-05 TDB
period 2088.66552566633
5.72		 1.3817e-05
3.783e-08		 d
yr
n .1723588557268652 1.1402e-09 deg/d
Q 3.677208012652497 1.6217e-08 au
   Orbit Determination Parameters
   # obs. used (total)      3216  
   data-arc span      42309 days (115.84 yr)  
   first obs. used      1905-01-15  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43325  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 01:54:26  

Additional Information
 Earth MOID = 1.73331 au 
 Jupiter MOID = 1.37905 au 
 T_jup = 3.176 
[ 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 10.8   n/a MPO267708  
diameter diameter 31.040 km 0.150 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 19.508 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Stephens, R.D. (2012) Minor Planet Bull. 39, 80-82.]
[Pilcher, F. (2017) Minor Planet Bull. 44, 112-114.]
geometric albedo albedo 0.119   0.018 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
SMASSII spectral type spec_B B   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)

555 Norma (A905 AF)          Discovered 1905-Jan-14 by Wolf, M. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 A905 AF = 1928 FS = 1939 BA = 1950 CC = 1954 UH2 = 1968 HE1 
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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