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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.


Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 118 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08634523281257768 1.1089e-08  
a 3.624663114980294 1.7495e-08 au
q 3.311690734450157 4.6842e-08 au
i 4.420094119697252 2.4457e-07 deg
node 116.570675603136 5.9526e-06 deg
peri 248.2493339998011 1.3489e-05 deg
M 38.41427355003911 1.4061e-05 deg
tp 2458731.538558700176
(2019-Sep-05.03855870)
9.7825e-05 TDB
period 2520.576596139695
6.90
1.8248e-05
4.996e-08
d
yr
n .1428244634784541 1.034e-09 deg/d
Q 3.937635495510431 1.9005e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3671  
   data-arc span      10749 days (29.43 yr)  
   first obs. used      1991-06-08  
   last obs. used      2020-11-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4219  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-21 09:29:25  

Additional Information
 Earth MOID = 2.31308 au 
 Jupiter MOID = 1.52025 au 
 T_jup = 3.094 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456300.5 (2013-Jan-08.0) TDB
Reference: JPL 118 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07621392877903782 9.0341e-09  
q 3.348418972467466 4.0221e-08 au
tp 2456138.335037101149
(2012-Jul-29.83503710)
0.00011121 TDB
node 117.0238130833504 5.8935e-06 deg
peri 239.1090801958874 1.5754e-05 deg
i 4.43746744092339 2.4052e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      3671  
   data-arc span      10749 days (29.43 yr)  
   first obs. used      1991-06-08  
   last obs. used      2020-11-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4219  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-21 09:29:25  

Additional Information
 Jupiter MOID = 1.52025 au 
 T_jup = 3.094 
Orbit Covariance (6×6)
  e q tp node peri i
e 8.161537530680122E-17 -3.326379799532794E-16 6.716972902200492E-13 8.077422574580761E-15 7.196709070513646E-14 2.378497763053995E-16
q -3.326379799532794E-16 1.617754062174603E-15 -1.973526990645173E-12 -3.663649874637817E-14 -1.769820675027514E-13 -1.132641747139691E-15
tp 6.716972902200492E-13 -1.973526990645173E-12 1.236711817994641E-8 -5.934172252578499E-11 1.620790688079944E-9 -1.907054500179754E-12
node 8.077422574580761E-15 -3.663649874637817E-14 -5.934172252578499E-11 3.473381386095447E-11 -4.22021991582561E-11 1.36310546962643E-12
peri 7.196709070513646E-14 -1.769820675027514E-13 1.620790688079944E-9 -4.22021991582561E-11 2.481750523668065E-10 -1.593727789914845E-12
i 2.378497763053995E-16 -1.132641747139691E-15 -1.907054500179754E-12 1.36310546962643E-12 -1.593727789914845E-12 5.784974760588962E-14

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. 2020-October); 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.]
[Carbognani, A.; Cellino, A.; Caminiti, S. (2019) Planet. Space Sci. 169, 15-34.]
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

[ show close-approach data ]
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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