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135 Hertha (A874 DA)
Classification: Main-belt Asteroid          SPK-ID: 2000135
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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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 113 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2069054883954004 3.6016e-08  
a 2.428763292659764 5.1465e-09 au
q 1.926238837395174 8.774e-08 au
i 2.303927372753607 3.9186e-06 deg
node 343.5675430578647 9.3611e-05 deg
peri 340.2346368532365 9.4049e-05 deg
M 134.2915911701598 1.0923e-05 deg
tp 2458684.769837924834
4.1182e-05 TDB
period 1382.535248329939
n .2603911910635689 8.2764e-10 deg/d
Q 2.931287747924353 6.2113e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3105  
   data-arc span      53186 days (145.62 yr)  
   first obs. used      1875-08-01  
   last obs. used      2021-03-14  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .41069  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 10:21:01  

Additional Information
 Earth MOID = .912304 au 
 Jupiter MOID = 2.39925 au 
 T_jup = 3.478 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 8.2   n/a MPO492749 IRAS observations used: 15
diameter diameter 79.24 km 2.0 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 15
rotation period rot_per 8.403 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Harris, A.W.; Young, J.W. (1983) Icarus 54, 59-109.]
[Lagerkvist, C.-I.; Hahn, G.; Magnusson, P.; Rickman, H.; Hammarback, G. (1986) in Asteroids, Comets, Meteors II. C.-I. Lagerkvist, B.A. Lindblad, M. Lundstedt, H. Rickman, Uppsala, eds. pp. 67-72.]
[Harris, A.W.; Young, J.W.; Dockweiler, T.; Gibson, J.; et al. (1992) Icarus 95, 115-147.]
[Michalowski, T. (1993) Icarus 106, 563-572.]
[Lagerkvist, C.-I.; Erikson, A.; Debehogne, H.; Festin, L.; et al. (1995) Astron. Astrophys. Suppl. Ser. 113, 115-129.]
[Torppa, J.; Kaasalainen, M.; Michalowski, T.; Kwiatkowski, T.; et al. (2003) Icarus 164, 346-383.]
[Behrend, R. (2006) Observatoire de Geneve web site,]
[Behrend, R. (2008) Observatoire de Geneve web site,]
[Warner, B.D.; Stephens, R.D.; Harris, A.W.; Shepard, M.K. (2009) Minor Planet Bull. 36, 38-39.]
[Durech, J. (2011) Database of Asteroid Models from Inversion Techniques (DAMIT).]
[Garceran, A.C. (2014) Posting on CALL web site.]
[Hanus, J.; Viikinkoski, M.; Marchis, F.; Durech, J.; et al (2017) Astron. Astrophys. 601, A114.]
[Carbognani, A.; Cellino, A.; Caminiti, S. (2019) Planet. Space Sci. 169, 15-34.]
geometric albedo albedo 0.1436   0.007 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 15
B-V BV 0.698   0.011 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=9; phase (min.=1.21, mean=8.17, max.=20.03) deg.
U-B UB 0.269   0.040 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=10; phase (min.=1.21, mean=10.38, max.=30.28) deg.
Tholen spectral type spec_T M   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo
SMASSII spectral type spec_B Xk   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)

135 Hertha (A874 DA)          Discovered 1874-Feb-18 by Peters, C. H. F. at Clinton
Reference: DISCOVERY.DBLast Updated: 2003-08-29
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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