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1075 Helina (1926 SC)
Classification: Main-belt Asteroid          SPK-ID: 2001075
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 42 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .109667622507799 1.258e-08  
a 3.01262763898843 1.0601e-08 au
q 2.682239928319285 3.7337e-08 au
i 11.53458956301333 7.1909e-07 deg
node 100.7273597162489 2.2173e-06 deg
peri 250.4475311860213 1.2424e-05 deg
M 22.69715816161369 9.8898e-06 deg
tp 2459080.083612467787
(2020-Aug-18.58361247)
5.2506e-05 TDB
period 1909.92630896461
5.23
1.0081e-05
2.76e-08
d
yr
n .1884889476155547 9.9489e-10 deg/d
Q 3.343015349657575 1.1763e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3669  
   data-arc span      41713 days (114.20 yr)  
   first obs. used      1906-12-23  
   last obs. used      2021-03-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .39473  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 11:55:46  

Additional Information
 Earth MOID = 1.70073 au 
 Jupiter MOID = 2.08306 au 
 T_jup = 3.209 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456863.5 (2014-Jul-25.0) TDB
Reference: JPL 42 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1138060330569966 1.2685e-08  
q 2.670177821601736 3.8009e-08 au
tp 2457171.597577870128
(2015-May-29.09757787)
5.133e-05 TDB
node 100.8241740588215 2.2215e-06 deg
peri 250.8953446063988 1.1922e-05 deg
i 11.52261239480023 7.1763e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      3669  
   data-arc span      41713 days (114.20 yr)  
   first obs. used      1906-12-23  
   last obs. used      2021-03-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .39473  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 11:55:46  

Additional Information
 Jupiter MOID = 2.08306 au 
 T_jup = 3.209 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.609041769188975E-16 -4.67523990970402E-16 1.676086983742204E-13 -3.384880986493723E-16 3.307418820541104E-14 1.419396908629736E-17
q -4.67523990970402E-16 1.444694602848666E-15 -6.316076076459703E-13 1.326733373782014E-15 -1.2871698814002E-13 -1.358149171378872E-17
tp 1.676086983742204E-13 -6.316076076459703E-13 2.634771940778765E-9 -1.016984543369291E-11 6.005934325525129E-10 -1.237006224760677E-12
node -3.384880986493723E-16 1.326733373782014E-15 -1.016984543369291E-11 4.934971615996767E-12 -7.024436307250666E-12 1.398490121940053E-12
peri 3.307418820541104E-14 -1.2871698814002E-13 6.005934325525129E-10 -7.024436307250666E-12 1.421400357089732E-10 -1.618520975093435E-12
i 1.419396908629736E-17 -1.358149171378872E-17 -1.237006224760677E-12 1.398490121940053E-12 -1.618520975093435E-12 5.14991730796306E-13

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 10.39   n/a E2021B10 IRAS observations used: 8
diameter diameter 26.198 km 0.414 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 44.9 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Behrend, R. (2013) 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.]
[Durech, J.; Hanus, J.; Oszkiewsicz, D.; Vanco, R. (2016) Astron. Astrophys. 587, A48.]
[Hanus, J.; Delbo, M.; Ali-Lagoa, V.; Bolin, B.; et al. (2016) Astron. Astrophys., submitted.]
[Hanus, J.; Delbo, M.; Ali-Lagoa, V.; Bolin, B.; et al. (2018) Icarus 299, 84-96.]
geometric albedo albedo 0.129   0.009 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
B-V BV 0.765   0.035 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=5.39, mean=6.82, max.=8.26) deg.
U-B UB 0.370   0.035 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=5.39, mean=6.82, max.=8.26) deg.
Tholen spectral type spec_T SU   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices; used ground-based radiometric albedo

1075 Helina (1926 SC)          Discovered 1926-Sep-29 by Neujmin, G. at Simeis
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1926 SC = 1930 KV = 1965 CB = A906 YG = A916 WH 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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