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JPL Small-Body Database Browser
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127 Johanna
Classification: Main-belt Asteroid          SPK-ID: 2000127
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 107 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06677181313028034 3.8917e-08  
a 2.755509279585644 1.0041e-08 au
q 2.571518928890398 1.0963e-07 au
i 8.24390823846783 4.3862e-06 deg
node 31.14508053619521 2.9363e-05 deg
peri 93.54010231706569 4.4793e-05 deg
M 10.5874301893353 3.3045e-05 deg
tp 2458951.365187546090
0.00015334 TDB
period 1670.710660385295
n .2154771670140523 1.1778e-09 deg/d
Q 2.939499630280891 1.0712e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2609  
   data-arc span      37416 days (102.44 yr)  
   first obs. used      1917-08-27  
   last obs. used      2020-02-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .454  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 15:17:50  

Additional Information
 Earth MOID = 1.60311 au 
 Jupiter MOID = 2.11153 au 
 T_jup = 3.326 
[ 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 8.6   n/a MPO337240  
diameter diameter 122 km n/a J.G. Williams (E-mail September 1990) based on assumed albedo of 0.048 for C-type
rotation period rot_per 12.7988 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Behrend, R. (2007) Observatoire de Geneve web site,]
geometric albedo albedo 0.042   0.005 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
Tholen spectral type spec_T CX   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices
SMASSII spectral type spec_B Ch   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)

127 Johanna          Discovered 1872-Nov-05 by Henry, Prosper at Paris
In their cooperative program it will probably never be known which of the Henry brothers discovered which planet. With strict impartiality, these discoveries were announced as having been made alternatively by Prosper and by Paul.
Note: "planet" implies "minor planet"
Reference: DISCOVERY.DBLast Updated: 2003-08-29
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
FirstGov 2020-Apr-05 08:03 UT
(server date/time)  
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