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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 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456447.5 (2013-Jun-04.0) TDB
Reference: JPL 40 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1499435599844592 3.1761e-08  
q 2.709407168824891 9.8461e-08 au
tp 2456012.934357542497
(2012-Mar-26.43435754)
7.5257e-05 TDB
node 130.4461049553206 8.3866e-05 deg
peri 356.0869567877583 8.4857e-05 deg
i 2.645746785449242 3.5561e-06 deg
  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
 Jupiter MOID = 1.37557 au 
 T_jup = 3.176 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.00875592558564E-15 -3.1105609553489E-15 9.28926277495301E-14 3.867532144430905E-17 3.128259161312573E-15 1.334311708595675E-16
q -3.1105609553489E-15 9.694587783838958E-15 -3.237775130901316E-13 -1.004548903516168E-14 -7.220964916653407E-15 -2.910832398531549E-16
tp 9.28926277495301E-14 -3.237775130901316E-13 5.663636335505549E-9 -1.175594676849261E-11 9.910443825450141E-10 -9.073409756103142E-13
node 3.867532144430905E-17 -1.004548903516168E-14 -1.175594676849261E-11 7.033529532681078E-9 -7.029212343590565E-9 -2.010650043033984E-13
peri 3.128259161312573E-15 -7.220964916653407E-15 9.910443825450141E-10 -7.029212343590565E-9 7.200716054740547E-9 5.996517776948331E-14
i 1.334311708595675E-16 -2.910832398531549E-16 -9.073409756103142E-13 -2.010650043033984E-13 5.996517776948331E-14 1.264555325958182E-11

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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