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6921 Janejacobs (1993 JJ)
Classification: Main-belt Asteroid          SPK-ID: 2006921
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 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08216473003200031 3.7173e-08  
a 2.278523171332118 6.5121e-09 au
q 2.091308930087957 8.4716e-08 au
i 5.321423338226114 3.3644e-06 deg
node 89.20046298370885 4.5123e-05 deg
peri 249.2993707478403 5.0915e-05 deg
M 267.5644478113862 2.4954e-05 deg
tp 2459523.063438694001
(2021-Nov-04.56343869)
8.7355e-05 TDB
period 1256.257307717412
3.44
5.3856e-06
1.474e-08
d
yr
n .2865654972022498 1.2285e-09 deg/d
Q 2.465737412576278 7.0472e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2520  
   data-arc span      16093 days (44.06 yr)  
   first obs. used      1976-06-20  
   last obs. used      2020-07-12  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46947  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 03:32:02  

Additional Information
 Earth MOID = 1.08678 au 
 Jupiter MOID = 2.78972 au 
 T_jup = 3.597 
[ 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 13.44   n/a E2021B10  
diameter diameter 5.269 km 0.042 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 5.062 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Stephens R.D. (2017) Minor Planet Bull. 44, 321-323.]
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
geometric albedo albedo 0.349   0.029 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

6921 Janejacobs           Discovered 1993 May 14 by S. Ueda and H. Kaneda at Kushiro.
Having moved to New York City during the Depression, Jane Jacobs (1916-2006) was way ahead of her time in championing the idea that cities are more important than nations in the "real economic world". Cities should not be laboratories for ill-placed expressways and housing projects but left to develop by themselves.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20060613/MPCPages.arcLast Updated: 2008-05-22

[ show close-approach data ]
Alternate Designations
 1993 JJ = 1976 MB = 1977 XV2 = 1980 TU1 = 1984 YN = 1987 SH22 = 1990 HE2 = 1990 MV1 = 1992 BF5 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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