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JPL Small-Body Database Browser
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157 Dejanira
Classification: Main-belt Asteroid          SPK-ID: 2000157
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1967756332692591 4.2191e-08  
a 2.580689560222472 9.9948e-09 au
q 2.072872737738329 1.0873e-07 au
i 12.16235296664639 4.5343e-06 deg
node 62.05289682438519 2.1957e-05 deg
peri 46.46539061362166 2.4366e-05 deg
M 189.4451742105145 1.1634e-05 deg
tp 2459317.903656130746
(2021-Apr-13.40365613)
5.0547e-05 TDB
period 1514.265662150441
4.15
8.7969e-06
2.408e-08
d
yr
n .2377389971907282 1.3811e-09 deg/d
Q 3.088506382706614 1.1962e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1725  
   data-arc span      41918 days (114.77 yr)  
   first obs. used      1904-11-13  
   last obs. used      2019-08-20  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45134  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Sep-23 19:05:38  

Additional Information
 Earth MOID = 1.10915 au 
 Jupiter MOID = 2.15806 au 
 T_jup = 3.366 
[ 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 11.2   n/a MPO452157  
diameter diameter 19.959 km 2.476 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 15.825 h n/a LCDB (Rev. 2019-January); Warner et al., 2009 Published Reference List:
[Warner, B.D. (2005) Minor Planet Bull. 32, 90-92.]
[Pilcher, F. (2009) Minor Planet Bull. 36, 100-102.]
[Hanus, J.; Durech, J.; Broz, M.; Marciniak, A.; et al. (2013) Astron. Astrophys. 551, A67.]
geometric albedo albedo 0.173   0.089 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

157 Dejanira          Discovered 1875-Dec-01 by Borrelly, A. at Marseille
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1978 TS1 = A904 VB 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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