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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 43 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06714802499921622 2.4542e-08  
a 2.72671414865885 6.9593e-09 au
q 2.543620678838988 6.5505e-08 au
i 3.824524259421777 1.0934e-06 deg
node 8.585131431109636 4.8291e-06 deg
peri 51.97760622617836 1.0749e-05 deg
M 135.4879343470364 1.0312e-05 deg
tp 2458581.549432948056
(2019-Apr-08.04943295)
4.6769e-05 TDB
period 1644.5907542436
4.50
6.2962e-06
1.724e-08
d
yr
n .2188994429593371 8.3804e-10 deg/d
Q 2.909807618478711 7.4266e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3392  
   data-arc span      52970 days (145.02 yr)  
   first obs. used      1876-02-25  
   last obs. used      2021-03-06  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4431  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 10:23:26  

Additional Information
 Earth MOID = 1.55732 au 
 Jupiter MOID = 2.29868 au 
 T_jup = 3.350 
[ 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 9.14   n/a E2021B10 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. 2020-October); 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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