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JPL Small-Body Database Browser
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157 Dejanira (A875 XA)
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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1972997760016172 4.2088e-08  
a 2.579741175427974 9.7037e-09 au
q 2.070758819373886 1.086e-07 au
i 12.16186041052479 4.4405e-06 deg
node 62.04384073259951 2.1952e-05 deg
peri 46.50334562327607 2.4258e-05 deg
M 284.574672583407 1.1769e-05 deg
tp 2459317.586194238110
(2021-Apr-13.08619424)
5.0264e-05 TDB
period 1513.431016284952
4.14
8.5392e-06
2.338e-08
d
yr
n .2378701084663237 1.3421e-09 deg/d
Q 3.088723531482062 1.1618e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1834  
   data-arc span      42018 days (115.04 yr)  
   first obs. used      1904-11-13  
   last obs. used      2019-11-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44029  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-03 20:02:34  

Additional Information
 Earth MOID = 1.10694 au 
 Jupiter MOID = 2.1569 au 
 T_jup = 3.367 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456267.5 (2012-Dec-06.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1957484710300582 4.1855e-08  
q 2.076162586540223 1.0787e-07 au
tp 2456286.093297505745
(2012-Dec-24.59329751)
4.5978e-05 TDB
node 62.09202402170484 2.1941e-05 deg
peri 46.08538874268933 2.4324e-05 deg
i 12.16250674830256 4.4388e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1834  
   data-arc span      42018 days (115.04 yr)  
   first obs. used      1904-11-13  
   last obs. used      2019-11-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44029  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-03 20:02:34  

Additional Information
 Jupiter MOID = 2.1569 au 
 T_jup = 3.367 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.751880196133932E-15 -4.502951746243458E-15 1.077768571778758E-13 7.082570605170187E-15 1.740228717899837E-14 -6.970935335661689E-16
q -4.502951746243458E-15 1.16364619245359E-14 -2.29166887953579E-13 -1.903983552031704E-14 -3.572918528969628E-14 1.954725413271786E-15
tp 1.077768571778758E-13 -2.29166887953579E-13 2.114018961617306E-9 -3.932795976202773E-12 5.065989290331518E-10 2.279045465213321E-12
node 7.082570605170187E-15 -1.903983552031704E-14 -3.932795976202773E-12 4.814090489234215E-10 -4.710976702392183E-10 7.014084663067499E-12
peri 1.740228717899837E-14 -3.572918528969628E-14 5.065989290331518E-10 -4.710976702392183E-10 5.916434857467062E-10 -6.409707429988154E-12
i -6.970935335661689E-16 1.954725413271786E-15 2.279045465213321E-12 7.014084663067499E-12 -6.409707429988154E-12 1.970303271599982E-11

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-August); 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 (A875 XA)          Discovered 1875-Dec-01 by Borrelly, A. at Marseille
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 A875 XA = 1978 TS1 = A904 VB 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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