Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
JPL Small-Body Database Browser
Search: [ help ]  
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 ]

[ hide orbit diagram ]

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 122 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08655043319569249 1.5778e-08  
a 3.625853320052954 1.6827e-08 au
q 3.312034144498331 6.2261e-08 au
i 4.420085968987546 4.4649e-07 deg
node 116.5704245509141 9.9801e-06 deg
peri 248.4020553221775 1.5854e-05 deg
M 66.81410916044423 1.3736e-05 deg
tp 2458732.463788620417
(2019-Sep-05.96378862)
9.5347e-05 TDB
period 2521.818193999095
6.90
1.7555e-05
4.806e-08
d
yr
n .1427541449485351 9.9375e-10 deg/d
Q 3.939672495607577 1.8283e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3786  
   data-arc span      10872 days (29.77 yr)  
   first obs. used      1991-06-08  
   last obs. used      2021-03-14  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .41503  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 11:00:49  

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 ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-Apr-16 01:11 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin