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JPL Small-Body Database Browser
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169 Zelia
Classification: Main-belt Asteroid          SPK-ID: 2000169
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 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1311470894253869 3.9213e-08  
a 2.357738304084691 5.9227e-09 au
q 2.048527787877236 9.2581e-08 au
i 5.500080547859727 4.4399e-06 deg
node 354.7495801394945 3.8999e-05 deg
peri 334.9978194046155 4.177e-05 deg
M 270.6120311505135 1.6438e-05 deg
tp 2459328.835917421325
(2021-Apr-24.33591742)
6.0811e-05 TDB
period 1322.336012251338
3.62
4.9826e-06
1.364e-08
d
yr
n .2722454782026872 1.0258e-09 deg/d
Q 2.666948820292146 6.6995e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2710  
   data-arc span      49331 days (135.06 yr)  
   first obs. used      1885-01-09  
   last obs. used      2020-02-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45409  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 15:18:55  

Additional Information
 Earth MOID = 1.03936 au 
 Jupiter MOID = 2.66321 au 
 T_jup = 3.535 
[ show covariance matrix ]

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 9.5   n/a MPO473762 IRAS observations used: 8
diameter diameter 37.517 km 0.706 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 14.537 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Stephens, R.D.; Pilcher, F. (2009) Minor Planet Bull. 36, 161.]
[Behrend, R. (2019) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.188   0.035 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
B-V BV 0.848   0.020 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=.93 deg.
U-B UB 0.458   0.026 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=.93 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 Sl   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)

169 Zelia          Discovered 1876-Sep-28 by Henry, Prosper at Paris
In their cooperative program it will probably never be known which of the Henry brothers discovered which planet. With strict impartiality, these discoveries were announced as having been made alternatively by Prosper and by Paul.
Note: "planet" implies "minor planet"
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1933 FC2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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