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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 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1021397222385981 3.6987e-08  
a 2.795981714848641 8.6863e-09 au
q 2.510400919109802 1.0323e-07 au
i 8.752209110793963 4.1862e-06 deg
node 91.9407828252408 2.8168e-05 deg
peri 291.950354197362 3.5379e-05 deg
M 123.903765455818 2.2111e-05 deg
tp 2458412.764502948210
(2018-Oct-21.26450295)
0.00010431 TDB
period 1707.65414723487
4.68
7.9577e-06
2.179e-08
d
yr
n .2108155217395351 9.8241e-10 deg/d
Q 3.081562510587481 9.5735e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2414  
   data-arc span      46588 days (127.55 yr)  
   first obs. used      1892-11-27  
   last obs. used      2020-06-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52449  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:12:02  

Additional Information
 Earth MOID = 1.53087 au 
 Jupiter MOID = 2.35957 au 
 T_jup = 3.302 
[ hide covariance matrix ]
Orbital Elements at Epoch 2455263.5 (2010-Mar-08.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09965594137325315 3.6749e-08  
q 2.517330864177627 1.0216e-07 au
tp 2454988.153815642118
(2009-Jun-05.65381564)
0.00010548 TDB
node 92.1351977078395 2.8121e-05 deg
peri 290.3003327870492 3.5783e-05 deg
i 8.758572457829969 4.1898e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2414  
   data-arc span      46588 days (127.55 yr)  
   first obs. used      1892-11-27  
   last obs. used      2020-06-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52449  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:12:02  

Additional Information
 Jupiter MOID = 2.35957 au 
 T_jup = 3.302 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.350516877864626E-15 -3.743422353213395E-15 -3.707334834176772E-13 1.922382250118582E-15 -7.469266877029252E-14 -2.683504473904066E-16
q -3.743422353213395E-15 1.043607442700669E-14 1.104950275191652E-12 -6.86931581557934E-15 2.245420188091312E-13 9.091379947957375E-16
tp -3.707334834176772E-13 1.104950275191652E-12 1.112659099160704E-8 -1.808153033190388E-11 2.357050431677972E-9 1.436321432547067E-12
node 1.922382250118582E-15 -6.86931581557934E-15 -1.808153033190388E-11 7.907925087458483E-10 -7.850197549056638E-10 9.580510067219517E-12
peri -7.469266877029252E-14 2.245420188091312E-13 2.357050431677972E-9 -7.850197549056638E-10 1.280399283877787E-9 -9.170187811989509E-12
i -2.683504473904066E-16 9.091379947957375E-16 1.436321432547067E-12 9.580510067219517E-12 -9.170187811989509E-12 1.755421644120114E-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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Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
2135-Nov-10 05:45 00:09 Vesta 0.0254605874020068 0.0254575774372001 0.0254635978619786 1.92616151818229 1.92615909194238 2501165.739872249 9.23040382275151 232.509586636476 34.7293781923248 51.2671893044502 84637.7784471585 T 37 CATAB v2.0f-lin.ifort 2020-Jun-23 15:12:24 2020-Jun-23 15:12
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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