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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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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 40 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1517437211489219 3.2339e-08  
a 3.19363550684997 1.5691e-08 au
q 2.709021371047233 1.0097e-07 au
i 2.665064242511627 3.5774e-06 deg
node 130.1791368280482 8.2707e-05 deg
peri 359.3117026589325 8.3684e-05 deg
M 188.0202829684523 1.2695e-05 deg
tp 2460196.366626035738
(2023-Sep-08.86662604)
7.3846e-05 TDB
period 2084.617834945622
5.71
1.5364e-05
4.206e-08
d
yr
n .1726935239472278 1.2727e-09 deg/d
Q 3.678249642652708 1.8072e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3240  
   data-arc span      42335 days (115.91 yr)  
   first obs. used      1905-01-15  
   last obs. used      2020-12-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .43215  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 11:04:31  

Additional Information
 Earth MOID = 1.72382 au 
 Jupiter MOID = 1.37557 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 10.84   n/a E2021B10  
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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