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1273 Helma (1932 PF)
Classification: Main-belt Asteroid          SPK-ID: 2001273
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 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1621064116409644 3.6159e-08  
a 2.393644749990703 6.6896e-09 au
q 2.005619588826477 8.882e-08 au
i 5.404163725518428 3.5505e-06 deg
node 296.494394454069 3.6224e-05 deg
peri 48.95586519844275 3.7635e-05 deg
M 298.5845519974333 1.1913e-05 deg
tp 2459431.261362019853
(2021-Aug-04.76136202)
4.5217e-05 TDB
period 1352.657890302701
3.70
5.6705e-06
1.552e-08
d
yr
n .2661426829214283 1.1157e-09 deg/d
Q 2.78166991115493 7.7741e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2774  
   data-arc span      32156 days (88.04 yr)  
   first obs. used      1932-08-08  
   last obs. used      2020-08-22  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4149  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:20:44  

Additional Information
 Earth MOID = 1.00094 au 
 Jupiter MOID = 2.62579 au 
 T_jup = 3.506 
[ 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 12.92   n/a E2021B10  
diameter diameter 6.278 km 0.287 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 6.0851 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Higgins, D.; Goncalves, R.M.D. (2007) Minor Planet Bull. 34, 16-18.]
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
[Durech, J.; Hanus, J.; Ali-Lagoa, V. (2018) Astron. Astrophys. 617, A57.]
[Erasmus, N.; Navarro-Meza, S.; McNeill, A.; Trilling, D.E.; et al. (2020) Ap. J. Suppl. Ser. 247, A13.]
geometric albedo albedo 0.340   0.047 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

1273 Helma (1932 PF)          Discovered 1932-Aug-08 by Reinmuth, K. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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