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JPL Small-Body Database Browser
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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.


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Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1790562060020566 3.9266e-08  
a 2.919612305062725 1.005e-08 au
q 2.396837602721274 1.143e-07 au
i 4.189828910772732 3.6073e-06 deg
node 315.5113064239231 5.3467e-05 deg
peri 37.23989277872371 5.4427e-05 deg
M 287.7047840214075 1.1936e-05 deg
tp 2458966.425996048488
(2020-Apr-26.92599605)
6.1166e-05 TDB
period 1822.158725087199
4.99
9.4082e-06
2.576e-08
d
yr
n .1975678600571815 1.0201e-09 deg/d
Q 3.442387007404176 1.1849e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2956  
   data-arc span      42550 days (116.50 yr)  
   first obs. used      1903-02-20  
   last obs. used      2019-08-20  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46393  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Sep-23 19:08:21  

Additional Information
 Earth MOID = 1.39209 au 
 Jupiter MOID = 2.00061 au 
 T_jup = 3.252 
[ 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 10.36   n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 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. 2019-January); 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

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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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