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160 Una (A876 DA)
Classification: Main-belt Asteroid          SPK-ID: 2000160
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.


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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 .0670378274338094 3.3187e-08  
a 2.727277346076219 8.2473e-09 au
q 2.544446597985824 9.0509e-08 au
i 3.824128436587486 4.2421e-06 deg
node 8.58624958936058 5.4544e-05 deg
peri 52.13551838473372 6.3512e-05 deg
M 91.55738106106179 3.1993e-05 deg
tp 2458582.108122059529
(2019-Apr-08.60812206)
0.00014633 TDB
period 1645.100311007334
4.50
7.4622e-06
2.043e-08
d
yr
n .2188316405943438 9.9262e-10 deg/d
Q 2.910108094166614 8.8001e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3183  
   data-arc span      44728 days (122.46 yr)  
   first obs. used      1897-12-27  
   last obs. used      2020-06-13  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44917  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:08:23  

Additional Information
 Earth MOID = 1.55892 au 
 Jupiter MOID = 2.29816 au 
 T_jup = 3.349 
[ 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 9.1   n/a MPO502154 IRAS observations used: 5
diameter diameter 81.24 km 2.1 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 5
rotation period rot_per 11.033 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Marciniak, A.; Michalowski, T.; Hirsch, R.; Polinska, K.; et al. (2009) Astron. Astrophys. 498, 313-320.]
[Behrend, R. (2011) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.0625   0.003 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 5
B-V BV 0.718   0.022 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=5.04, mean=5.97, max.=6.91) deg.
U-B UB 0.363   0.040 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=5.04, mean=5.97, max.=6.91) deg.
Tholen spectral type spec_T CX   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices
SMASSII spectral type spec_B C   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)

160 Una (A876 DA)          Discovered 1876-Feb-20 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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