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JPL Small-Body Database Browser
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189 Phthia
Classification: Main-belt Asteroid          SPK-ID: 2000189
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 76 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03566134700549521 3.8347e-08  
a 2.450068801055491 6.5154e-09 au
q 2.362696047353714 9.5008e-08 au
i 5.175021146636595 4.2752e-06 deg
node 203.357843353084 4.6433e-05 deg
peri 168.1126569236233 7.7601e-05 deg
M 336.5911598240987 6.3089e-05 deg
tp 2459091.584240788018
(2020-Aug-30.08424079)
0.00024554 TDB
period 1400.766823015994
3.84
5.5876e-06
1.53e-08
d
yr
n .2570020892020295 1.0252e-09 deg/d
Q 2.537441554757268 6.7478e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2736  
   data-arc span      51034 days (139.72 yr)  
   first obs. used      1880-02-08  
   last obs. used      2019-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48007  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 15:20:15  

Additional Information
 Earth MOID = 1.36242 au 
 Jupiter MOID = 2.59456 au 
 T_jup = 3.490 
[ 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 9.3   n/a MPO492750 IRAS observations used: 14
diameter diameter 38.490 km 0.317 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 22.346 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Pilcher, F. (2009) Minor Planet Bull. 36, 25-27.]
[Behrend, R. (2016) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.]
geometric albedo albedo 0.170   0.031 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
B-V BV 0.904   0.033 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=1.81, mean=10.24, max.=17.53) deg.
U-B UB 0.491   0.021 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=1.81, mean=10.24, max.=17.53) deg.
Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 4 color indices; used ground-based radiometric albedo
SMASSII spectral type spec_B Sa   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)

189 Phthia          Discovered 1878-Sep-09 by Peters, C. H. F. at Clinton
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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