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699 Hela (A910 LC)
Classification: Mars-crossing Asteroid          SPK-ID: 2000699
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4103792210979039 3.3916e-08  
a 2.612298442916025 4.9613e-09 au
q 1.54026544263688 8.8747e-08 au
i 15.29662332891178 3.817e-06 deg
node 242.5518190913394 1.618e-05 deg
peri 91.33511274096443 1.66e-05 deg
M 331.084817091114 5.6882e-06 deg
tp 2459124.367124920865
(2020-Oct-01.86712492)
2.465e-05 TDB
period 1542.171291533063
4.22
4.3934e-06
1.203e-08
d
yr
n .2334371038914401 6.6502e-10 deg/d
Q 3.684331443195171 6.9974e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2403  
   data-arc span      42942 days (117.57 yr)  
   first obs. used      1902-11-21  
   last obs. used      2020-06-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42259  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:19:10  

Additional Information
 Earth MOID = .625631 au 
 Jupiter MOID = 2.11382 au 
 T_jup = 3.238 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 11.3   n/a MPO473771  
rotation period rot_per 3.3962 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Harris, A.W.; Young, J.W.; Bowell, E.; Tholen, D.J. (1999) Icarus 142, 173-201.]
[Pilcher, F.; Warner, B.D.; Goretti, V. (2000) Minor Planet Bull. 27, 56-57.]
[Szabo, Gy.M.; Csak, B.; Sarneczky, K.; Kiss, L.L. (2001) Astron. Astrophys. 375, 285-292.]
[Behrend, R. (2003) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2016) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Warner, B.D. (2017) Minor Planet Bull. 44, 12-19.]
B-V BV 0.854   0.025 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=26.92, mean=27.07, max.=27.22) deg.
U-B UB 0.386   0.046 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=26.92, mean=27.07, max.=27.22) deg.
Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo
SMASSII spectral type spec_B Sq   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

699 Hela (A910 LC)          Discovered 1910-Jun-05 by Helffrich, J. at Heidelberg
June 3, given by some authorities, is erroneous.
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 A910 LC = 1948 KD = 1957 WX1 = A902 WE = A923 TB 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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