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522 Helga (A904 AF)
Classification: Outer Main-belt Asteroid          SPK-ID: 2000522
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.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 116 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08634521111588543 3.8188e-08  
a 3.62466312935681 1.9705e-08 au
q 3.31169082622853 1.4595e-07 au
i 4.420097535632459 3.6602e-06 deg
node 116.5705572144058 5.3946e-05 deg
peri 248.2494568773707 5.7736e-05 deg
M 38.41426796877275 2.0408e-05 deg
tp 2458731.538596177806
(2019-Sep-05.03859618)
0.00014314 TDB
period 2520.576611135755
6.90
2.0554e-05
5.627e-08
d
yr
n .1428244626287262 1.1647e-09 deg/d
Q 3.937635432485089 2.1407e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3649  
   data-arc span      43534 days (119.19 yr)  
   first obs. used      1901-08-23  
   last obs. used      2020-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43583  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:28:43  

Additional Information
 Earth MOID = 2.31308 au 
 Jupiter MOID = 1.52025 au 
 T_jup = 3.094 
[ 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 9.0   n/a MPO337245  
diameter diameter 101.22 km 3.5 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 12
rotation period rot_per 8.129 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Licchelli, D. (2006) Minor Planet Bull. 33, 11-13.]
[Behrend, R. (2007) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Chiorny, V.G.; Shevchenko, V.G.; Krugly, Yu.N.; Velichko, F.P.; Gaftonyuk, N.M. (2007) Planet. Space Sci. 55, 986-997.]
[Fauerbach, M.; Bennett, T.; Marks, S.A. (2007) Minor Planet Bull. 34, 57-58.]
[Behrend, R. (2008) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2009) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.0388   0.003 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 12
B-V BV 0.664   0.007 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=6.82, mean=11.23, max.=13.82) deg.
U-B UB 0.243   0.024 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=6.82, mean=11.23, max.=13.82) deg.
Tholen spectral type spec_T X   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices

522 Helga (A904 AF)          Discovered 1904-Jan-10 by Wolf, M. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 A904 AF = 1936 QP = A902 WB 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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