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JPL Small-Body Database Browser
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346 Hermentaria (A892 WC)
Classification: Main-belt Asteroid          SPK-ID: 2000346
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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1021397243434595 3.734e-08  
a 2.795981714360427 8.7772e-09 au
q 2.5104009127863 1.0438e-07 au
i 8.752209227859668 4.2422e-06 deg
node 91.94078256100752 2.8247e-05 deg
peri 291.9503552362092 3.5486e-05 deg
M 123.9037650872808 2.2125e-05 deg
tp 2458412.764504850300
(2018-Oct-21.26450485)
0.00010439 TDB
period 1707.654146787602
4.68
8.041e-06
2.202e-08
d
yr
n .2108155217947518 9.9269e-10 deg/d
Q 3.081562515934554 9.6737e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2309  
   data-arc span      46539 days (127.42 yr)  
   first obs. used      1892-11-27  
   last obs. used      2020-04-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53426  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 01:04:06  

Additional Information
 Earth MOID = 1.53087 au 
 Jupiter MOID = 2.35957 au 
 T_jup = 3.302 
[ hide covariance matrix ]
Orbital Elements at Epoch 2455135.5 (2009-Oct-31.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09961393161619565 3.7086e-08  
q 2.517157328760221 1.0325e-07 au
tp 2454987.909345159047
(2009-Jun-05.40934516)
0.00010575 TDB
node 92.13464529315922 2.8199e-05 deg
peri 290.2374270311483 3.5904e-05 deg
i 8.758907327487425 4.2459e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2309  
   data-arc span      46539 days (127.42 yr)  
   first obs. used      1892-11-27  
   last obs. used      2020-04-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53426  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 01:04:06  

Additional Information
 Jupiter MOID = 2.35957 au 
 T_jup = 3.302 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.375346716211554E-15 -3.818265493030573E-15 -3.364046830262882E-13 2.121301029238628E-15 -6.548979721840121E-14 -3.199341790582436E-16
q -3.818265493030573E-15 1.066152607077078E-14 1.004097584806508E-12 -7.608992882657054E-15 1.974521942439792E-13 1.064975456063114E-15
tp -3.364046830262882E-13 1.004097584806508E-12 1.118245251416056E-8 -1.87611217028401E-11 2.372948802032528E-9 1.665577267324769E-12
node 2.121301029238628E-15 -7.608992882657054E-15 -1.87611217028401E-11 7.951923738400902E-10 -7.895029094929239E-10 8.138868476919389E-12
peri -6.548979721840121E-14 1.974521942439792E-13 2.372948802032528E-9 -7.895029094929239E-10 1.28909481246535E-9 -7.697624967872049E-12
i -3.199341790582436E-16 1.064975456063114E-15 1.665577267324769E-12 8.138868476919389E-12 -7.697624967872049E-12 1.802772586831422E-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 7.3   n/a MPO502156 IRAS observations used: 12
diameter diameter 86.447 km 1.926 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 28.523 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Harris, A.W.; Young, J.W. (1989) Icarus 81, 314-364.]
[Bembrick, C.S.; Pereghy, B.; Ainsworth, A.; Bolt, G. (2004) Minor Planet Bull. 31, 52-53.]
[Pilcher, F. (2016) Minor Planet Bull. 43, 222-224.]
geometric albedo albedo 0.332   0.071 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
B-V BV 0.843   0.026 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=4.82, mean=11.55, max.=17.85) deg.
U-B UB 0.485   0.019 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=4.82, mean=11.55, max.=17.85) deg.
Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices
SMASSII spectral type spec_B S   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)

346 Hermentaria (A892 WC)          Discovered 1892-Nov-25 by Charlois, A. at Nice
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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