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189 Phthia
Classification: Main-belt Asteroid          SPK-ID: 2000189
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457400.5 (2016-Jan-13.0) TDB
Reference: JPL 59 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03708028715269901 4.2322e-08  
a 2.450329432056392 7.6281e-09 au
q 2.359470513097031 1.0533e-07 au
i 5.177232025139952 5.07e-06 deg
node 203.4250783697239 4.7095e-05 deg
peri 168.2345589350453 7.3463e-05 deg
M 285.3915558829183 5.7315e-05 deg
tp 2457690.849193660343
(2016-Oct-29.34919366)
0.0002233 JED
period 1400.990343046063
3.84
6.5421e-06
1.791e-08
d
yr
n .2569610859824203 1.1999e-09 deg/d
Q 2.541188351015753 7.911e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1531  
   data-arc span      49554 days (135.67 yr)  
   first obs. used      1880-02-08  
   last obs. used      2015-10-12  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .60262  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Oct-28 15:47:47  

Additional Information
 Earth MOID = 1.35743 au 
 Jupiter MOID = 2.59846 au 
 T_jup = 3.489 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 9.33 mag n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 14
diameter diameter 37.66 km 2.0 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 14
rotation period rot_per 22.346 h n/a LCDB (Rev. 2015-December); Warner et al., 2009 Published Reference List:
[Pilcher, F. (2009) Minor Planet Bul. 36, 25-27.]
[Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2015) Astron. Astrophys., in press.arXiv:1510.07422]
geometric albedo albedo 0.2310   0.027 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 14
B-V BV .904 mag .033 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=3; phase (min.=1.81, mean=10.24, max.=17.53) deg.
U-B UB .491 mag .021 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #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 | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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