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2911 Miahelena (1938 GJ)
Classification: Main-belt Asteroid          SPK-ID: 2002911
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 43 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09749880010562439 1.0256e-08  
a 2.793232368859086 1.1621e-08 au
q 2.520895564479134 3.2625e-08 au
i 9.617117325013023 5.1404e-07 deg
node 149.2198684315822 5.7449e-06 deg
peri 64.37967856535803 1.5059e-05 deg
M 240.9089870948623 1.7142e-05 deg
tp 2459764.573262588534
(2022-Jul-04.07326259)
8.2959e-05 TDB
period 1705.136009663679
4.67
1.0641e-05
2.913e-08
d
yr
n .2111268532009985 1.3175e-09 deg/d
Q 3.065569173239037 1.2754e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2914  
   data-arc span      30302 days (82.96 yr)  
   first obs. used      1938-04-07  
   last obs. used      2021-03-24  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .41579  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 20:37:10  

Additional Information
 Earth MOID = 1.53311 au 
 Jupiter MOID = 1.94248 au 
 T_jup = 3.301 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457111.5 (2015-Mar-30.0) TDB
Reference: JPL 43 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09772958445615891 1.0314e-08  
q 2.519757208706299 3.2743e-08 au
tp 2456359.333430447854
(2013-Mar-07.83343045)
7.3983e-05 TDB
node 149.2911941290771 5.7398e-06 deg
peri 65.16044184951834 1.501e-05 deg
i 9.621132327620614 5.1379e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      2914  
   data-arc span      30302 days (82.96 yr)  
   first obs. used      1938-04-07  
   last obs. used      2021-03-24  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .41579  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 20:37:10  

Additional Information
 Jupiter MOID = 1.94248 au 
 T_jup = 3.301 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.063735633035451E-16 -3.207441418046786E-16 1.676543264048002E-13 6.067686291758854E-15 2.385687098775612E-14 -2.63022364808509E-15
q -3.207441418046786E-16 1.0721276264564E-15 -2.436475579283881E-13 -1.90972644556117E-14 -1.35579408695984E-14 6.696486075871029E-15
tp 1.676543264048002E-13 -2.436475579283881E-13 5.473528808643526E-9 -1.038192338325007E-11 1.034492315855892E-9 -1.153722951092872E-11
node 6.067686291758854E-15 -1.90972644556117E-14 -1.038192338325007E-11 3.294533798557702E-11 -3.264542728605479E-11 -1.95927469909232E-12
peri 2.385687098775612E-14 -1.35579408695984E-14 1.034492315855892E-9 -3.264542728605479E-11 2.252853948327342E-10 -2.823732280167325E-13
i -2.63022364808509E-15 6.696486075871029E-15 -1.153722951092872E-11 -1.95927469909232E-12 -2.823732280167325E-13 2.639784009475486E-13

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 11.78   n/a E2021B10  
diameter diameter 12.214 km 0.192 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 4.201 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Brinsfield, J. (2008) Minor Planet Bull. 35, 119-122.]
[Klinglesmith III, D.A.; Hanowell, J.; Risely, E.; Turk, J.; et al. (2013) Minor Planet Bull. 40, 190-193.]
[Warner, B.D. (2014) Minor Planet Bull. 41, 27-32.]
[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.; McNeill, A.; Mommert, M.; Trilling, D.E.; et al. (2018) Ap. J. Suppl. Series 237, A19.]
[Erasmus, N.; McNeill, A.; Mommert, N.; Trilling, D.E.; et al. (2019) Ap. J. Suppl. Series 242, A15.]
geometric albedo albedo 0.358   0.059 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
SMASSII spectral type spec_B S   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)

2911 Miahelena (1938 GJ)          Discovered 1938-Apr-08 by Alikoski, H. at Turku
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1938 GJ = 1928 DL = 1942 CM = 1952 HQ1 = 1952 HZ1 = 1971 HK = 1975 EF2 = 1977 TE6 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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