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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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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 121 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08655044330379343 1.5778e-08  
a 3.625853385958799 1.6832e-08 au
q 3.312034168049504 6.2264e-08 au
i 4.420086464968175 4.4651e-07 deg
node 116.5704250478536 9.9807e-06 deg
peri 248.4020454278163 1.5856e-05 deg
M 66.81411551093699 1.3739e-05 deg
tp 2458732.463731373901
(2019-Sep-05.96373137)
9.5364e-05 TDB
period 2521.818262756384
6.90
1.756e-05
4.808e-08
d
yr
n .1427541410563483 9.9402e-10 deg/d
Q 3.939672603868093 1.8288e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3782  
   data-arc span      10862 days (29.74 yr)  
   first obs. used      1991-06-08  
   last obs. used      2021-03-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41521  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Mar-16 11:18:11  

Additional Information
 Earth MOID = 2.31189 au 
 Jupiter MOID = 1.51945 au 
 T_jup = 3.093 
[ 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 9.06   n/a E2021B10  
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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