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406 Erna (A895 QA)
Classification: Main-belt Asteroid          SPK-ID: 2000406
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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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 43 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1782617550040232 3.7347e-08  
a 2.916792698779972 8.2865e-09 au
q 2.396840113312533 1.0818e-07 au
i 4.193222923836667 3.1042e-06 deg
node 315.4784689261026 5.2423e-05 deg
peri 37.51006056519817 5.3312e-05 deg
M 46.12642089117846 1.0558e-05 deg
tp 2458967.366850979124
(2020-Apr-27.86685098)		 5.3199e-05 TDB
period 1819.519746514003
4.98		 7.7538e-06
2.123e-08		 d
yr
n .1978544067409655 8.4314e-10 deg/d
Q 3.43674528424741 9.7636e-09 au
   Orbit Determination Parameters
   # obs. used (total)      3512  
   data-arc span      43067 days (117.91 yr)  
   first obs. used      1903-02-20  
   last obs. used      2021-01-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43402  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 00:46:18  

Additional Information
 Earth MOID = 1.39136 au 
 Jupiter MOID = 2.01104 au 
 T_jup = 3.253 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456382.5 (2013-Mar-31.0) TDB
Reference: JPL 43 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1825921536449898 3.756e-08  
q 2.382044258356851 1.0941e-07 au
tp 2457148.424750336084
(2015-May-05.92475034)		 5.1241e-05 TDB
node 315.7913766612104 5.2486e-05 deg
peri 37.40484096366878 5.3321e-05 deg
i 4.193576547999725 3.1055e-06 deg
   Orbit Determination Parameters
   # obs. used (total)      3512  
   data-arc span      43067 days (117.91 yr)  
   first obs. used      1903-02-20  
   last obs. used      2021-01-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43402  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 00:46:18  

Additional Information
 Jupiter MOID = 2.01104 au 
 T_jup = 3.253 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.410780503863513E-15 -4.1015998604107E-15 8.315739377544291E-13 -4.790694142154226E-15 1.133422375619811E-13 -1.500740058384286E-15
q -4.1015998604107E-15 1.19701156518529E-14 -2.437681244875092E-12 1.410804471709243E-14 -3.380987666462652E-13 4.507300602675809E-15
tp 8.315739377544291E-13 -2.437681244875092E-12 2.625657587501635E-9 1.19498446827803E-12 4.995054631242545E-10 -1.839844632787429E-12
node -4.790694142154226E-15 1.410804471709243E-14 1.19498446827803E-12 2.754744574092666E-9 -2.746777329522643E-9 1.607154278948866E-11
peri 1.133422375619811E-13 -3.380987666462652E-13 4.995054631242545E-10 -2.746777329522643E-9 2.843126312006613E-9 -1.635889739355035E-11
i -1.500740058384286E-15 4.507300602675809E-15 -1.839844632787429E-12 1.607154278948866E-11 -1.635889739355035E-11 9.644004779399881E-12

[ 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 10.40   n/a E2021B10 IRAS observations used: 12
diameter diameter 46.266 km 0.310 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 8.789 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Hanus, J.; Durech, J.; Broz, M.; Marciniak, A.; et al. (2013) Astron. Astrophys. 551, A67.]
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.060   0.007 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
B-V BV 0.738   0.036 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=9.10, mean=9.32, max.=9.53) deg.
U-B UB 0.273   0.035 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=9.10, mean=9.32, max.=9.53) deg.
Tholen spectral type spec_T P   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo

406 Erna (A895 QA)          Discovered 1895-Aug-22 by Charlois, A. at Nice
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 A895 QA = 1949 KD1 = A903 DA = A905 OB 
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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